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the groundbreaking discovery of neutrino oscillations represents a concrete indication of new physics and the measurement of the oscillation parameters has the potential to unlock new knowledge on the fundamental building blocks of matter. for measuring the neutrino properties to percent-level precision, an ambitious accelerator-based experimental program was started by two international collaborations: hyperk and dune. however, these experiments will only be able to achieve their unprecedented precision goal if our current knowledge of neutrino-nucleus interactions in the detectors is dramatically improved. in this contribution, we describe how experiments based on electron beams can provide key information to neutrino experiments, benchmarking theoretical models, improving simulations needed for a reliable extraction of the neutrino oscillation parameters, and decisively contribute to the success of next-generation neutrino experiments. | electron scattering for neutrino physics at mami and mesa |
cosmological observations indicate that most of the matter in the universe is dark matter. dark matter in the form of weakly interacting massive particles (wimps) can be detected directly, via its elastic scattering off target nuclei. most current direct detection experiments only measure the energy of the recoiling nuclei. however, directional detection experiments are sensitive to the direction of the nuclear recoil as well. newsdm is meant to be the first experiment with a solid target for directional dark matter searches: the use of a nuclear emulsion based detector, acting both as target and tracking device, would allow to extend dark matter searches beyond the neutrino floor and provide an unambiguous signature of the detection of galactic dark matter. | directional search for dark matter using nuclear emulsions with newsdm |
we apply the no-core shell model with continuum (ncsmc) that is capable of describing both bound and unbound states in light nuclei in a unified way with chiral two- and three-nucleon interactions as the only input. the ncsmc can predict structure and dynamics of light nuclei and, by comparing to available experimental data, test the quality of chiral nuclear forces. we discuss applications of ncsmc to the α-α scattering and the structure of 8be, the p+7be and p+7li radiative capture and the production of the hypothetical x17 boson claimed in atomki experiments. the 7be(p, γ)8b reaction plays a role in solar nucleosynthesis and solar neutrino physics and has been subject of numerous experimental investigations. we also highlight our investigation of the neutron rich exotic 8he that has been recently studied experimentally at triumf with an unexpected deformation reported. | ab initio investigations of a=8 nuclei: α-α scattering, deformation in 8he, radiative capture of protons on 7be and 7li and the x17 boson |
searches for light dark matter (dm) and studies of coherent elastic neutrino-nucleus scattering (cevns) imply the detection of nuclear recoils in the 100 ev range. however, an absolute energy calibration in this regime is still missing. the crab project proposes a method based on nuclear recoils induced by the emission of an mev gamma following thermal neutron capture. a detailed feasibility study has shown that this method yields distinct nuclear recoil calibration peaks at 112 ev and 160 ev above background for tungsten. in the first phase, the crab project foresees to perform a nuclear recoil calibration of cryogenic cawo4 detectors read-out by tes, similar to the detectors used in cresst and nucleus. the low-power triga reactor in vienna provides a clean beam of thermal neutrons well suited for such a measurement. newly developed and compact sub-kev calibration sources based on x-ray fluorescence (xrf) provide an absolute energy calibration during operation at the research reactor as well as in the dm/cevns experiments. in the second phase, additional tagging of the photons produced in the de-excitation process will allow extending the calibration method to even lower energies and to a wider range of detector materials, such as ge. combined with the xrf source, crab may allow measuring energy quenching in the sub-kev regime. | accurate calibration of nuclear recoils at the 100 ev scale using neutron capture |
since its prediction in 1974, the measurement of the coherent elastic neutrino-nucleus scattering (ce υns) has been a great challenge for many experimentalists. one of the main factors is the small recoil energies of the nucleus produced by this interaction, which is dominant for energies ≾ 50 mev, for medium target masses. the detection was finally achieved by the coherent experiment in 2017 and several other experiments are currently close to performing this measurement for different neutrino energies and sources, thanks to the development of very low threshold and background detectors. measuring ceυns opens up new possibilities to test the standard model and to look for new physics beyond it. the purpose of this contribution is to provide a brief overview of the state-of-the-art on this subject, with a focus on some of the latest experimental results and future perspectives. | coherent elastic neutrino-nucleus scattering |
non-standard interactions (nsi) between neutrinos and electrons can significantly modify the decoupling of neutrinos from the plasma. these interactions have two effects on the overall picture: (i) they alter neutrino oscillations though matter effects and (ii) they modify the scattering and annihilation processes involving neutrinos and electrons and positrons. we study the role of non-universal and flavour-changing nsi in the decoupling and how they impact the determination of the effective number of neutrinos, n eff. we examine the degeneracies between nsi parameters and we compare the expected sensitivity from future cosmological surveys with the current limits from terrestrial experiments. we outline the complementarity between both approaches. | cosmological radiation density with non-standard neutrino-electron interactions |
due to their large active volume and low energy threshold for particle detection time projection chambers (tpcs) are promising candidates to characterise neutrino beams at the next generation long baseline neutrino oscillation experiments such as dune and hyper-k. the higher target density for the incoming neutrino beam of a tpc filled with gas at high pressure (hptpc) will potentially allow a better neutrino-nucleus interaction measurements as compared with tpcs at atmospheric pressure. the hptpc we built has an active volume of about 0.5 m3 which is embedded into a pressure vessel rated up to 6 bar absolute pressure. a cascade of three meshes amplifies the primary ionisations. the induced charge on each mesh is read out. in addition the photons emitted during the gas amplification are read out by four ccd cameras focused on the readout plane, which thus image the 2d projection of a particle's tracks on the transverse plane. the third coordinate is reconstructed from the charge signal. we tested the hptpc's performance during a four week beam test at the cern ps, measuring low momentum proton (≤0.5gev) interactions with the counting gas. several mixtures with argon predominance have been tested for their light yield and gas gain. the aim is to calculate the proton-ar cross-section from the data sample, which will enter the calculations of final state interactions in neutrino ar scattering. | commissioning and beam test of a high pressure time projection chamber |
the nova experiment is an off-axis long-baseline neutrino oscillation experiment seeking to measure $\nu_{\mu}$ disappearance and $\nu_{e}$ appearance in a $\nu_{\mu}$ beam originating at fermilab. in addition to measuring the unoscillated neutrino spectra for the purposes of predicting the oscillated neutrino spectrum in the far detector, the 293-ton near detector also enables high-statistics investigation into neutrino scattering in numerous reaction channels. we discuss the various near detector analyses currently in progress, including inclusive measurements of both electron and muon neutrino charged-current interactions and efforts to constrain the off-axis numi flux using the elastic scattering of neutrinos from atomic electrons. | recent cross section work from nova |
the deep underground neutrino experiment (dune) far detector (fd) will be formed by four 10-kton liquid argon (lar) time projection chambers (tpc) using both single and dual-phase technology. the dual-phase technology foreseen the charge amplification in the gas phase before the signal collection and is following a staged approach to demonstrate its feasibility at the dune fd scale. in 2017, a 4-ton demonstrator of 3x1x1 m$^3$ volume was exposed to cosmic muons and demonstrated expected performance in terms of charge extraction and light collection. a bigger prototype (protodune-dp), with an active volume of 6x6x6 m$^3$, is currently under commissioning at cern. the photon detection system in these detectors is crucial to provide the trigger signal giving an absolute time reference for the charge acquisition system of rare non-beam events, and to provide complementary calorimetry. an overview of the analysis of the light collected in the 4-ton demonstrator has been presented. these prototypes confirmed the performance of the light detection system to provide trigger based on the scintillation light signal, to characterize the lar response to the crossing muons and to monitor the lar purity. the analyzed data are compared with mc simulations to improve the values of less understood lar optical parameters such as the rayleigh scattering length. | scintillation light production, propagation and detection in the 4-ton dual-phase lar-tpc demonstrator (data analysis and simulations) |
coherent elastic neutrino-nucleus scattering is a potential probe of nuclear neutron form factors. we show that the neutron root-mean-square (rms) radius can be measured with tonne-scale detectors of argon, germanium, or xenon. in addition, the fourth moment of the neutron distribution can be studied experimentally using this method. the impacts of both detector size and detector shape uncertainty on such a measurement were considered. the important limiting factor was found to be the detector shape uncertainty. in order to measure the neutron rms radius to 5%, comparable to current experimental uncertainties, the detector shape uncertainty needs to be known to 1% or better. | prospects for using coherent elastic neutrino-nucleus scattering to measure the nuclear neutron form factor |
direct dark matter searches are nowadays one of the most exciting research topics. several experimental efforts are concentrated on the development, construction, and operation of detectors looking for the scattering of target nuclei with weakly interactive massive particles (wimps). in this field a new frontier can be opened by directional detectors able to reconstruct the direction of the wimp-recoiled nucleus thus allowing to extend dark matter searches beyond the neutrino floor. exploiting directionality would also give a proof of the galactic origin of dark matter making it possible to have a clear and unambiguous signal to background separation. the angular distribution of wipm-scattered nuclei is indeed expected to be peaked in the direction of the motion of the solar system in the galaxy, i.e. toward the cygnus constellation, while the background distribution is expected to be isotropic. current directional experiments are based on the use of gas tpc whose sensitivity is limited by the small achievable detector mass. in this paper we show the potentiality in terms of exclusion limit of a directional experiment based on the use of a solid target made by newly developed nuclear emulsions and read-out systems reaching sub-micrometric resolution. | discovery potential for directional dark matter detection with nuclear emulsions |
the lux collaboration released its 332 live-day wimp search result in june 2016. besides wimps, there are several other rare particles to search for using two-phase xenon detectors, such as axion-like pseudoscalars, axions, and electrophilic dark matter. all of these proposed particles interact with xenon via electron recoils at low energy. also, the neutrino magnetic moment can be searched for by examining the rates of neutrino-electron scattering at low energy. therefore, understanding xenon's response in this low-energy regime is vitally important. 37ar is an ideal source for calibrating a detector at these low energies, because it decays via electron capture (ec) and releases x-rays at two energies: 2.8 kev due to ec from the k-shell and 0.27 kev due to ec from the l-shell. additionally, 37ar can be used to precisely study recombination fluctuations at a specific energy in the wimp region of interest. recombination fluctuations limit electron recoil discrimination efficiency, so understanding how these fluctuations change with electric drift field is important to all lux analysis. this talk will explain the motivation, creation, deployment, and results of the 37ar source in lux over a wide range of drift fields. | 37 ar calibration of the large underground xenon experiment |
minerνa (main injector experiment for v-a) is a few-gev neutrino nucleus scattering experiment at fermilab using various nuclei as targets. the experiment provides measurements of neutrino and anti-neutrino cross sections off of nuclear targets which are important for neutrino oscillation experiments and the probing of the nuclear medium. presented are recent results from minerνa on inclusive charged-current neutrino scattering, and pion production processes. | recent results from minerνa |
neutrinos are elementary particles electrically neutral which belong to the family of leptons. as a consequence and in first approximation they only undergo weak processes. this gives them very special properties. they are ideal tools to study precisely the weak interactions, but there is a price to pay: neutrinos are characterized by extremely low probabilities of interactions, they easily penetrate large amount of matter without being stopped. consequently, it is hard to perform neutrino physics measurements. in practice the difficulty is twofold: in order to accumulate enough statistics, experiments must rely on huge fluxes traversing huge detectors, the number of interactions being obviously proportional to these two factors. as a corollary, backgrounds are difficult to handle because they appear much more commonly than good events. nevertheless, neutrino interactions have been detected from a variety of sources, both man-made and natural, from very low to very large energies. the aim of this review is to survey our current knowledge about interaction cross sections of neutrinos with matter across all pertinent energy scales. we will see that neutrino interactions cover a large range of processes: nuclear capture, inverse beta-decay, quasi-elastic scattering, resonant pion production, deep inelastic scattering and ultra-high energy interactions. all the gathered information will be used to study weak properties of matter but it will also allow to explore the properties of the neutrinos themselves. in particular, the known three different flavors of neutrinos have different behaviors inside matter and this will be relevant to give some precious understanding about their intrinsic parameters in particular their masses and mixings. as a second order process, neutrinos can undergo electromagnetic interactions. this will also be discussed. although the corresponding phenomena are not yet experimentally proven by actual measurements, the theory is able to calculate them and it is useful to discuss the topic since it may become an important issue to test ideas of cosmological relevance. this review will mainly adopt an experimental point of view. strong emphasis will be placed on important detectors which have illustrated the challenging progresses in neutrino physics; they will be described and their results confronted to theoretical predictions. | interactions of neutrinos with matter |
experiments in neutrino physics cover a wide range—from deep inelastic scattering, over long base-line oscillation experiments and low-energy coherent neutrino-nucleus scattering (ceνns), to searches for neutrinoless double β decay (0νββ)—yet in all cases a key aspect in interpreting the results concerns understanding neutrino-nucleus interactions. if the neutrino energy is sufficiently low, the required matrix elements can be constrained in a systematic way by the interplay of effective field theories, phenomenology, and lattice qcd. in these proceedings, we illustrate this strategy focusing on the ceνns and 0νββ processes. | interplay of nuclear physics, effective field theories, phenomenology, and lattice qcd in neutrino physics |
nova is a long-baseline accelerator-based neutrino oscillation experiment that uses the numi beam from fermilab to measure electron-neutrino appearance and muon-neutrino disappearance using a near detector, located at fermilab, and a far detector, located in ash river, minnesota. the high flux of muon neutrinos at the near detector allows for measurement of rare processes such as neutrino trident scattering, a rare standard model process in which a charged-lepton pair is produced via neutrino-nucleus scattering. differences in event topology between the dimuon, the trident channel where the outgoing leptons are a muon and antimuon, and other muon neutrino charged current interactions necessitate developing reconstruction algorithms specific to these events. in this talk, we will discuss the estimated event rate for dimuons in the nova near detector and techniques developed to reconstruct and identify dimuons. doe. | neutrino tridents in the nova near detector |
coherent elastic neutrino-nucleus scattering (cevns), was first observed by the coherent collaboration in 2017 using a 14.6-kg sodium-doped csi scintillator detector. efforts on measuring cevns in different types of nuclei in order to test the n2 dependence of the cross section, are a current focal point of research. the first 5 modules of the nai neutrino experiment tonne-scale (naivete) will be deployed this year in the spallation neutron source (sns) in oak ridge national laboratory (ornl) to measure cevns in 23na, as well as the inclusive cross section of the electron neutrino charged-current interactions on 127i. understanding background events prior to deployment of the actual detector is a key part of achieving a successful measurement of cevns. to that end, geant4 simulations have been implemented. this talk will present our results on the construction of the detector geometry using gears, and discuss our latest results of the simulations. work supported by u.s. department of energy. | the simulation of the coherent multi-tonne nai[tl] detector (naivete) |
the coherent collaboration program for studying neutrino scattering involves multiple detector targets located in neutrino alley in the basement of the oak ridge national laboratory (ornl) spallation neutron source. two measurements of the coherent elastic neutrino-nucleus scattering (cevns) cross section on a csi detector and in a liquid argon (lar) detector have been published. to continue studying the neutron number squared dependence of the cross section, an 18 kg germanium detector array and a 2.4 tonne nai detector array will be deployed. for neutrino flux studies, a d2o detector will be deployed. in addition, a study of the charged-current electron-neutrino scattering on 127i and neutrino-induced neutron (nin) production are underway along with extensive neutron background studies. a study of neutrino induced fission on thorium is planned and a cryocsi experiment is under development. an update on the status of detector systems and planned experiments in neutrino alley will be presented. supported in part by nsf np2013205. | the coherent neutrino scattering program at the ornl spallation neutron source |
one of the least constrained contributions to the neutral current (nc) elastic neutrino-proton cross section is the strange axial form factor, which represents the strange quark spin contribution to the spin structure of the proton. this becomes the net strange spin contribution, $\delta s$, in the limit when the negative four-momentum transfer squared ($q^2$) is zero. the strange axial form factor can be determined by studying nc elastic scattering events in the microboone detector. microboone's unique ability to detect low-energy protons is expected to allow the reconstruction of these events with a $q^2$ as low as 0.10 gev$^2$ and to determine the strange axial form factor in a model-independent approach. we present a selection of neutral current elastic events in a subset of microboone neutrino data, as well as our plan to extract the strange part of the axial form factor and $\delta s$ from this selection in the full data set. | studying neutral current elastic scattering and the strange axial form factor in microboone |
in the field of direct dark matter search, a variety of experiments have been developed over the past decades aiming at detecting weakly interactive massive particles (wimps) via their scattering in a detector medium and, in the last years, several experimental efforts are concentrated on the directionality approach: the observation of the incoming apparent direction of wimps would in fact provide a new and unambiguous signature and the proof of the galactic origin of dark matter. furthermore the directionality appears as the only way to overcome the neutrino background that is expected to finally prevent standard techniques to further lower cross-section limits. the newsdm experiment has been proposed to measure the direction of wimp-induced nuclear recoils by using a novel emulsion technology with improved spatial resolution. in this paper we will present the status of the experiment, the performances of the newly developed read-out systems reaching sub-micrometric resolution and we will discuss the expected sensitivity and discovery potential. | newsdm: an emulsion-based directional dark matter experiment |
coherent elastic neutrino-nucleus scattering (ceν ns), detected for the first time more than 40 years after its prediction, represents an experimental challenge because of its signature: a single nuclear recoil with energy in the range of 10 ev to a few 10's kev on average. one of the main features of ceν ns is its cross section, around two orders of magnitude higher compared with the inverse β decay. basket (bolometers at sub kev energy threshold) project aims at investigating cryogenic calorimeters for the ceν ns detection, able to maintain the background level below the expected signature while being operated in above ground conditions in close vicinity to a nuclear reactor. the main requirements for such detectors are a low enough energy threshold of o(10 ev), and a fast signal rise time in the range of 0.1-1 ms to achieve good timing resolution and hence good mitigation of pile-up events. in this article, we report on the first tests of a prototype detector coupling a li2wo4 crystal to a magnetic metallic calorimeter (mmc) thermal sensor. | first tests of li2wo4 bolometric detectors using mmc sensors for the detection of ceν ns |
minerva is a neutrino scattering experiment to make precision measurements of cross sections and investigate nuclear effects. a precise understanding of neutrino interactions is crucial for the neutrino oscillation program. several cross sections will be presented, including pion production, kaon production as well as direct comparisons of the same process on different nuclei. comparisons with theoretical models are reported. | the minerva experiment |
the standard model has been a theory with the greatest success in describing the fundamental interactions of particles. as of the writing of this dissertation, the standard model has not been shown to make a false prediction. however, the limitations of the standard model have long been suspected by its lack of a description of gravity, nor dark matter. its largest challenge to date, has been the observation of neutrino oscillations, and the implication that they may not be massless, as required by the standard model. the growing consensus is that the standard model is simply a lower energy effective field theory, and that new physics lies at much higher energies. the qweak experiment is testing the electroweak theory of the standard model by making a precise determination of the weak charge of the proton (qpw). any signs of "new physics" will appear as a deviation to the standard model prediction. the weak charge is determined via a precise measurement of the parity-violating asymmetry of the electron-proton interaction via elastic scattering of a longitudinally polarized electron beam of an un-polarized proton target. the experiment required that the electron beam polarization be measured to an absolute uncertainty of 1 %. at this level the electron beam polarization was projected to contribute the single largest experimental uncertainty to the parity-violating asymmetry measurement. this dissertation will detail the use of compton scattering to determine the electron beam polarization via the detection of the scattered photon. i will conclude the remainder of the dissertation with an independent analysis of the blinded qweak. | compton scattering polarimetry for the determination of the proton's weak charge through measurements of the parity-violating asymmetry of 1h(e,e')p |
a large number of the presently running neutrino and dark-matter experiments use thallium-doped cesium-iodide csi[tl] crystals, sodium-doped cesium-iodide csi[na] crystals, or thallium-doped sodium-iodide nai[tl] crystals. in the present paper we calculate elastic and inelastic cross sections for neutral-current supernova-neutrino scattering off 127i and 133cs, relevant for experiments using csi[tl], csi[na], or nai[tl] crystals. we study also the cross sections folded with two-parameter fermi-dirac distributions of the supernova-neutrino spectrum. the adopted nuclear-theory framework is the microscopic quasiparticle-phonon model, able to operate in large single-particle valence bases and use g-matrix based two-nucleon interactions with a phenomenological renormalization. | neutral-current supernova neutrino-nucleus scattering off 127i and 133cs |
the coherent experiment at the oak ridge national laboratory (ornl) spallation neutron source (sns) aims to study coherent elastic neutrino nucleus scattering (cevns) with different detector technologies. the first observation of cevns was recently made by the coherent experiment with a 14 csi detector. the result is in agreement with the standard model prediction. this initial data already improves constraints on non-standard neutrino interactions. in addition, coherent has a 185 nai crystal array, a 22 lar detector and is planning to deploy a 10 ppc hpge. the single-phase lar detector (cenns-10) started data-taking in dec. 2016 and will provide results on cevns from a light nucleus where nuclear form factors are close to unity. the motivation for cevns detection, coherent experiment overview, the first cevns measurement, and a survey of the future experimental program will be presented. coherent collaborators are supported by the u. s. department of energy office of science, the national science foundation, nasa, and the sloan foundation. | search for cevns at the sns with the coherent experiment |
a variety of experiments have been developed over the past decades, aiming to detect weakly interactive massive particles (wimps) via their scattering in a detector medium. the sensitivity of these experiments has improved with a tremendous speed due to a constant development of the detectors and analysis methods. detectors that are able to reconstruct the direction of the nucleus recoiling against the scattering wimp are opening a new frontier to possibly extend dark matter searches beyond the neutrino background. exploiting directionality would also give a proof of the galactic origin of dark matter making it possible to have a clear and unambiguous signal to background separation. the newsdm experiment, based on nuclear emulsions, is proposed to measure the direction of wimp-induced nuclear recoils. we discuss the potentiality, both in terms of exclusion limits and potential discovery, of a directional experiment based on the use of a solid target made by newly developed nuclear emulsions and read-out systems reaching sub-micrometric resolution. we also report results of the technical test conducted in gran sasso last year. directional search for dark matter using nuclear emulsion. | directional search for dark matter using nuclear emulsion |
the microboone experiment is an 85 ton active volume liquid-argon time projection chamber (lartpc) located in the booster neutrino beamline at fermilab. the excellent calorimetric and spatial resolution of the lartpc allows us to identify isolated proton tracks with lengths as short as 2 cm, which is equivalent to proton kinetic energy t = 50 mev. we report the progress towards the first measurement of muon neutrino neutral current elastic scattering from protons in argon in the region of four-momentum transfer squared, 0.1 < q2 < 1 gev2, using microboone's 6.87 × 1020 pot data. we also present our plan to extract the strange quark contribution to the axial form factor, which is crucial for understanding the strange quark contribution to the proton spin. | studies of neutral current neutrino-nucleon scattering with the microboone detector |
modeling lepton-nucleus scattering with the accuracy required to extract neutrino-oscillation parameters from long- and short-baseline experiments necessitates retaining most quantum-mechanical effects. one such effect is the interference between one- and two-body current operators in the transition currents, which has been known to enhance the cross-sections, especially in transverse kinematics. in this work, we incorporate such interference in the spectral function formalism, which combines relativistic currents and kinematics with an accurate description of the initial target state. our analysis of lepton-scattering off $^{12}$c demonstrates that interference effects appreciably enhance the transverse electromagnetic response functions and the flux-folded neutrino-nucleus cross section, in both cases, improving the agreement with experimental data. we discuss the impact on the neutrino-oscillation program and the determination of nucleon axial form factors. | one and two-body current contributions to lepton-nucleus scattering |
programs are underway to search for light dark matter (dm) with masses between 1 and 1000 mev produced by photon and electron interactions in a beam dump. we summarize various strategies being pursued. details are given on the beam-dump experiment (bdx) at jefferson lab, which will use a 1 m3 segmented csi(tl) scintillator detector placed downstream of hall a and accumulate 1022 electrons-on-target (eot) in 285 days. the dark matter signal is an electromagnetic shower of few hundreds of mev, together with a reduced activity in the surrounding active veto counters. this experiment would be sensitive to elastic dm-electron and to inelastic dm scattering at the level of 10 counts per year, reaching the limit of the neutrino irreducible background.the proposed experiment will be sensitive to large regions of dm parameter space, exceeding the discovery potential of existing and planned experiments in the mev-gev dm mass range by up to two orders of magnitude. this material is based upon work supported by the u.s. department of energy, office of science, office of nuclear physics under contract de-ac05-06or23177. | beam dump experiments with photon and electron beams |
accurate neutrino cross-section measurements and the modeling of nuclear effects are required for precise measurements of neutrino oscillation physics, such as cp-violation and the ordering of the neutrino masses. significant model discrepancies are observed from different neutrino cross section measurements in numerous experiments. this talk will review the various efforts to constrain neutrino-nucleus interactions, including different cross section measurements, reanalysis of the bubble chamber data, and a new effort from electron scattering to constrain neutrino iteration modeling. | constraining the neutrino-nucleus interaction for neutrino oscillations |
neutrino-nucleus interactions at low energies can produce excited nuclear states that can de-excite by emitting particles, including neutrons. neutrino-induced neutrons (nins) produced in common gamma shielding material, such as lead and iron, can pose a background for coherent elastic neutrino-nucleus scattering experiments. additionally, nin production in lead is the primary mechanism for the helium and lead observatory (halo) to detect supernova neutrinos, and iron-based supernova nin detectors have been proposed. the coherent collaboration has deployed two detectors to study nin production in lead and iron to the spallation neutron source (sns) at oak ridge national laboratory (ornl). an overview of the detector design, signal predictions, and latest results will be presented. | a measurement of neutrino-induced neutron production in lead and iron nuclei |
coherent is a collaboration whose goal is to measure coherent elastic neutrino-nucleus scattering (cevns). coherent plans to deploy a suite of detectors to measure the expected number-of-neutrons squared dependence of cevns at the spallation neutron source at oak ridge national laboratory. one of these detectors is a liquid argon detector which can measure these low energy nuclear recoil interactions. ensuring optimal functionality requires the development of a slow control system to monitor and control various aspects, such as the temperature and pressure, of these detectors. electronics manufactured by beckhoff, digilent, and arduino among others are being used to create these slow control systems. this poster will generally discuss the assembly and commissioning of this cenns-10 liquid argon detector at indiana university and will feature work on the slow control systems. | assembly and commissioning of a liquid argon detector and development of a slow control system for the coherent experiment |
results of investigations of the near-horizontal muons in the range of zenith angles of 85-95 degrees are presented. in this range, so-called "albedo" muons (atmospheric muons scattered in the ground into the upper hemisphere) are detected. albedo muons are one of the main sources of the background in neutrino experiments. experimental data of two series of measurements conducted at the experimental complex nevod-decor with the duration of about 30 thousand hours "live" time are analyzed. the results of measurements of the muon flux intensity are compared with simulation results using monte-carlo on the basis of two multiple coulomb scattering models: model of point-like nuclei and model taking into account finite size of nuclei. | results of measurements of the flux of albedo muons with nevod-decor experimental complex |
numerous investigations discuss neutrino properties from low to ultra high energies. this review discusses several topics that are investigated in present day experiments. the first section covers the detection of $\tau$-neutrinos of cosmic origin and describes the significance of the results. the second topic points out that the reported reduction of the antineutrino flux in reactor experiments may be created by short wavelength oscillations where the detector averages over several wavelengths and observes only an average reduction of the antineutrino flux. in many theories the propagating particles are majoranas and have an anapole moment; they scatter on atomic electrons with a distinct signature in $\bar\nu_e+e^-\rightarrow\bar\nu_e+e^-$ scattering. | open issues in neutrino reactions |
we give a brief representation of the theoretical results from the color dipole picture, covering the total photoabsorption cross section, high-energy j/ψ photoproduction with respect to recent experimental data from the lhcb collaboration at cern, and ultra-high energy neutrino scattering, relevant for the ice-cube experiment. | on the color dipole picture |
we present a continuum random phase approximation approach to study electron- and neutrino-nucleus scattering cross sections, in the kinematic region where quasielastic scattering is the dominant process. we show the validity of the formalism by confronting inclusive ($e,e'$) cross sections with the available data. we calculate flux-folded cross sections for charged-current quasielastic antineutrino scattering off $^{12}$c and compare them with the miniboone cross-section measurements. we pay special emphasis to the contribution of low-energy nuclear excitations in the signal of accelerator-based neutrino-oscillation experiments. | quasielastic electron- and neutrino-nucleus scattering in a continuum random phase approximation approach |
we present a detailed study of charged-current quasielastic neutrino-nucleus scattering and of the influence of correlations on one- and two-nucleon knockout processes. the quasielastic neutrino-nucleus scattering cross sections, including the influence of long-range correlations, are evaluated within a continuum random phase approximation approach. the short-range correlation formalism is implemented in the impulse approximation by shifting the complexity induced by the correlations from the wave functions to the operators. the model is validated by confronting $(e,e^\prime)$ cross-section predictions with electron scattering data in the kinematic region where the quasielastic channel is expected to dominate. further, the $^{12}$c$(\nu,\mu^-)$ experiments are studied. double differential cross sections relevant for neutrino-oscillation $^{12}$c$(\nu,\mu^-)$ cross sections, accounting for long- and short-range correlations in the one-particle emission channel and short-range correlations in the two-particle two-hole channel, are presented for kinematics relevant for recent neutrino-nucleus scattering measurements. | correlations in neutrino-nucleus scattering |
the coherent experiment aims to study coherent elastic neutrino nucleus scattering (cevns) with various nuclei using pulsed neutrinos provided by the spallation neutron source at ornl. the first observation of cevns was reported by the coherent collaboration with a 14 kg csi detector. the present dataset with twice more statistics is being analyzed. in addition, coherent has a 22 kg lar detector and is planning to deploy a 2 t nai array and a 14.4 kg p-type point-contact germanium detector array to demonstrate the characteristic n2 dependence of the cevns cross section. proposed high statistics cevns measurements from ton-scale detectors would open new channels to search for physics beyond the standard model such as non-standard neutrino interactions, accelerator produced dark matter, weak mixing angle and electromagnetic properties of neutrinos. these measurements will also provide studies of charge-current neutrino cross sections in an energy range important for supernova physics. the status of the coherent experiment along with the future experimental program involving the cevns measurements will be presented. coherent collaborators are supported by the u. s. department of energy office of science, the national science foundation, nasa, and the sloan foundation. | coherent experiment at the spallation neutron source |
xmass is a multi-purpose experiment using a single-phase liquid-xenon scintillator detector located underground at kamioka observatory in japan. thanks to a low-energy threshold and low background, the xmass detector has a potential to pursue various topics in a field of neutrino physics. for example, xmass has a possibility to detect galactic supernova neutrinos via coherent elastic neutrino-nucleus scattering. we have also searched for two-neutrino double electron capture on ^{124} xe and set the most stringent lower limit on the half-life at 2.1× 10^{22} years at 90% confidence level. in this poster, we will discuss the latest results on neutrino related subjects from xmass. | neutrino physics with the xmass liquid xenon detector |
the t2k experiment's off-axis near detector (nd280) has recently measured ccqe-like (mesonless) neutrino interactions on hydrocarbon as a series of differential cross-section measurements exploiting both muon and proton kinematics in addition to correlations between them. these results provide a novel probe of the aspects of neutrino-nucleus interactions most pertinent to long-baseline neutrino oscillation analyses, particularly through the first measurement of imbalances in the plane transverse to the incoming neutrino. in this work we review the results and present a detailed campaign of model comparisons, which allow a detailed exploration of relevant nuclear-medium effects. this characterisation is expected to play a significant role in future model development, while also facilitating new constraints on the principle systematic uncertainties in neutrino oscillation measurements. | characterisation of nuclear effects in muon-neutrino scattering at t2k |
the <emph type="smallcap">majorana demonstrator</emph> is an experiment searching for neutrinoless double beta decay in 76ge. it consists of two modular arrays totaling 44 kg of high purity ge detectors operating at the 4850' level of the sanford underground research facility in south dakota. the p-type point contact detector technology employed yields sharply-defined pulse characteristics that allow powerful rejection of background event populations. we detail the performance of multisite compton-scattered gamma background rejection through the avse cut parameter, based on the amplitude of the current pulse relative to the total deposited energy. we discuss the systematics associated with this cut and demonstrate its impact on the scientific reach of the experiment. this material is supported by the u.s. department of energy, office of science, office of nuclear physics, the particle astrophysics and nuclear physics programs of the national science foundation, and the sanford underground research facility. | background rejection through pulse shape discrimination in the majorana demonstrator |
with wimp-nucleon scattering limits approaching the neutrino floor, and coherent elastic neutrino-nucleus scattering (cevns) experimentally established, there is renewed interest in constructing a large-scale nuclear recoil observatory capable of detecting and distinguishing wimp and cevns interactions via directionality. the cygnus proto-collaboration aims to deploy multiple gas-target time projection chambers (tpcs) to accomplish this. i will discuss the projected dark matter sensitivity and neutrino physics case for cygnus, and compare the suitability of different technological approaches. u.s. department of energy. | the proposed cygnus directional nuclear recoil observatory |
the nova experiment is a long-baseline neutrino oscillation experiment designed to measure muon neutrino to electron neutrino oscillation. it uses the numi beam at fermilab and consists of a far detector in ash river, minnesota and a near detector at fermilab. an accurate prediction of the neutrino flux is important to both oscillation and cross-section studies at nova. neutrino-electron elastic scattering is a pure leptonic process with well-known cross section. it provides an in situ constraint on the absolute flux. this poster discusses the measurement of neutrino-electron elastic scattering and the constraining of neutrino flux at the nova near detector. | measurement of neutrino-electron elastic scattering at nova near detector |
a electron of mass $m$, when electrically scatters of nucleus, of mass $m$, transfers momentum $q$ to the nucleus. the energy lost by electron is more than the energy gained by the nucleus. the resulting energy goes in exciting the atom to a higher energy state as in frank hertz experiment and sodium, neon, mercury vapor lamps, or ionization of atom as in bubble and cloud chamber experiments, or just production of x-rays as in bremsstraulung. in this paper, we study these phenomenon. these experiments are inelastic scattering experiments. we remark, why neutrinos donot scatter and can penetrate earth, why muons travel further than electrons in materials and why a material like lead plate can slow down electrons and positrons efficiently. we look at the elastic scattering of electrons as in electron diffraction and electron microscopes. we look at scattering of electrons in the condensed matter, these phenomenon range from scattering of electrons of periodic potential, to give bloch waves, scattering of electrons of phonons and impurities to give resistance, scattering of electrons of lattice to give cooper pairs and superconductivity. we study electron scattering from exchange potential as in fermi liquid theory and resulting $t^2$ resistance at low temperatures. electron scattering of exchange potential resulting in chemical reactions. we turn our attention to electron-proton scattering both eleastic and inelastic, as in deep inelastic scattering experiments and understand the independence of ineleastic cross-section of with respect to transferred momentum. we see, why we can just say that there are three quarks in proton from elastic cross-section. our main contribution in this article is we are detailed at places, we find literature terse. | aspects of electron scattering, the elastic, and the inelastic |
the koto experiment is a particle physics experiment located in j-parc, japan, aiming to explore physics beyond the standard model by measuring the branching ratio of the $k_l\rightarrow\pi^{0}\nu\bar{\nu}$ decay. this decay has not yet been observed. the branching ratio predicted by the standard model of $(3.0\pm0.3)\times10^{-11}$ and the current experimental upper limit established by kek e391a is $2.6\times10^{-8}$. the signal of $k_l\rightarrow\pi^{0}\nu\bar{\nu}$ decay has the signature of two photons on the calorimeter with no signal on the veto detectors. it also has a large transverse momentum due to missing neutrinos. kaons that decay outside the beam line with final product of two photons, such as $k_l\rightarrow\gamma\gamma$ and $k_l\rightarrow\pi^{+}\pi^{-}\pi^{0}$, can appear to have large transverse momentum due to kaon scattering and beam interaction with the detectors. these off-axis kaon decay events can impact the upper limit of $k_l\rightarrow\pi^{0}\nu\bar{\nu}$ branching ratio. aluminum targets located at the upstream of the koto detector and inside the decay-volume were used to study kaon beam profile, which provided off-axis kaon decay vertex information. the beam profile provided insights on background contributions to the signal. studies on the kaon beam profile and background identification from kaon scattering were presented in this talk. | kaon-scatter introduced backgrounds in the koto experiment |
since a long time electron scattering has been envisaged as a powerful and preferential tool to investigate nuclear properties. in particular, the (e,e'p) knockout reaction has provided a wealth of information on the single particle (s.p.) aspects of nuclear structure, on the validity and the limit of the independent particle shell model. the work done for electron scattering is extremely useful also for the analysis and the interpretation of neutrino oscillation experiments, where nuclei are used as neutrino detectors and it is crucial that nuclear effects in neutrino-nucleus interactions are well under control. in this contribution it is discussed if and how the work done for (e,e'p) can be exploited for the analysis of neutrino-nucleus scattering data. | from (e,e'p) to neutrino scattering |
liquid argon is widely used as a detector medium in particle physics, and is a promising technique for the future in the detection of neutrinos and possibly more exotic particles. low energy recoils in argon are of special interest: coherent elastic neutrino-nucleus scattering (cenns) and elastic scattering of dark matter in the form of low mass wimps are both expected to produce nuclear recoils at sub-kev energies. this regime that is largely unexplored in today's argon detectors. to properly model and analyze experimental data, an understanding of liquid argon response to nuclear recoils (signal) and electronic recoils (background) is needed at these energies. we present here a new measurement of the electronic recoil ionization yield of liquid argon at 0.27 kev using an ar-37 calibration source dissolved in the liquid. the measurement spans a range of applied electric fields, and is the lowest energy multi-field calibration in liquid argon to date. we will describe the experiment, explain the analysis, and compare our results to existing models of ionization in liquid argon. these data provide information on the backgrounds in searches for low energy nuclear recoils and inform detector response models for existing and future experiments. | measuring sub-kev ionization yields in liquid argon for dark matter and coherent neutrino scattering searches |
the nova experiment is a long-baseline neutrino oscillation experiment designed to measure (a) the appearance of electron neutrino and antineutrino, and (b) the disappearance of muon neutrino and antineutrino. it consists of two segmented, liquid-scintillator detectors positioned 14 mrad off-axis from the fermilab numi beam. in addition to the neutrino oscillation measurements, the nova near detector, located at fermilab, provides an excellent opportunity for the measurement of neutrino interactions. in this talk, i present a measurement of the νe charged-current inclusive cross section between 1-3 gev, and the status of flux constraints using ν - e elastic scattering. nova collaboration. | νe charged-current inclusive cross section measurement and the status of flux constraints using ν - e elastic scattering in the nova near detector |
ship is a new general purpose fixed target facility, whose technical proposal has been recently submitted to the cern sps committee. in its initial phase, the 400gev proton beam extracted from the sps will be dumped on a heavy target with the aim of integrating 2×1020 pot in 5years. a dedicated detector located downstream of the target, based on a long vacuum tank followed by a spectrometer and particle identification detectors, will allow probing a variety of models with light long-lived exotic particles and masses below a few gev/c2. the beam dump is also an ideal source of tau neutrinos, the less known particle in the standard model. another dedicated detector, based on the emulsion cloud chamber technology already used in the opera experiment, will allow to perform for the first time measurements of the tau neutrino deep inelastic scattering cross section. tau neutrinos will be distinguished from tau anti-neutrinos, thus providing the first observation of the tau anti-neutrino. | the ship experiment at cern sps |
coherent elastic neutrino-nucleus scattering (cevns) has a large enough cross section that, if discovered, could open new doors in neutrino detection, such as reductions in size and cost of neutrino experiments. cevns is theorized to have a n2 dependence (n being number of neutrons), which can be analyzed through detection by many different materials. thus, we propose the use of bgo as a new, potential material for neutrino detection. bgo is in excess amount in tunl facilities in the form of a neutral meson spectrometer. because the nms has multiple bgo sheets, it is possible to trigger these sheets as individual data points to track the path of neutrinos through charged-current interaction. additionally, because the bgo project is an untested use of material in neutrino detection, there will be specific designs of electronics, acquisition, analysis scripts that will be reusable for future use of bgo. the final bgo detector can be deployed to oak ridge national laboratory for data acquisition and analysis in the spallation neutron source in high neutrino flux to track paths of neutrinos through a charged current interaction and potential detection of cevns and comparison to other materials for dependence on n2. | rebuilding bgo detector array for neutrino physics experiments |
neutrino-nuclear interactions are an integral part of accelerator based measurements of neutrino oscillation. however, the presence of significant nuclear effects complicates our understanding and can be a source of bias in the determination of oscillation parameters. the modeling of nuclear effects can be tested against new measurements made with a range of target materials and incident beams. answers to outstanding questions in neutrino nuclear scattering are presented based on recent results from t2k, minerνa, noνa and argoneut experiments, alongside new questions and puzzles. | progress in neutrino-nuclear scattering |
neutrino-nucleus (νn) elastic scattering has been observed with neutrinos from decay-at-rest pions, in which the quantum-mechanical coherency effects are only partial. to probe full coherency, studies of νn scattering with lower energy neutrino sources would be necessary. we will review various projects pursuing this goal with solar (the "neutrino floor" to direct wimp searches) and reactor neutrinos, discussing their experimental challenges, status and prospects. | neutrino-nucleus coherent scattering with reactor and solar neutrinos |
a technique using layered wavelength shifting, scintillating and non-scintillating films is presented to achieve discrimination of surface alpha events from low-energy nuclear recoils in liquid argon detectors. a discrimination power greater than 108, similar to the discrimination possible for electronic recoils in argon, can be achieved by adding a thin layer of scintillator with a suitably slow decay time to a wavelength-shifter coated surface. the technique allows suppression of surface alpha events in a very large next-generation argon dark matter experiment (with hundreds of square meters of surface area) without the requirement for position reconstruction, and could also be used to suppress surface backgrounds in compact argon detectors of low-energy nuclear recoils, for example in measurements of coherent neutrino-nucleus scattering or for sensitive measurements of neutron fluxes. supported by the natural sciences and engineering research council of canada and the canada foundation for innovation. | surface background rejection in liquid argon dark matter detectors using layered wavelength-shifting and scintillating thin films |
ongoing experiments are searching for dark matter or coherent neutrino scattering signals via the identification of nuclear recoils using germanium and silicon as detector materials. at the sub-kev recoil energy scales being probed by the latest generation of such experiments, the ionization yield of nuclear recoils in germanium and silicon is an important, but poorly characterized, material property. a technique has been proposed to measure this yield using the spectrum of nuclear recoils resulting from nuclear de-excitation following thermal neutron capture in the detector crystal. this talk will present a method to measure this thermal neutron-capture signal in germanium and silicon detectors developed for the super cryogenic dark matter search at snolab. the measurement technique and detector principle will be discussed as will some challenges faced in performing measurements at such low energies. preliminary evidence of the desired signal in a silicon detector will also be presented. this work was supported by doe grant de-sc0012294 and nsf grant 1743790. | low energy nuclear recoil calibration with neutron capture |
precision accelerator-based neutrino oscillation measurements relay on precise and accurate modeling of the interaction of neutrinos with atomic nuclei. at the moment, our insufficient understanding of such interactions is a dominant systematic in extraction of neutrino oscillation parameters and can stand as a significant challenge for achieving the goals of next-generation neutrino oscillation experiments such as dune and t2-hyperk. following the spirit of stuart freedman's own research, this talk will focus on the synergy between nuclear and particle physics in searching for a deeper understanding of our universe. specifically, i will present new results from novel experimental constrains on neutrino-nucleus interactions, from synergic measurements of wide phase-space neutrino and electron exclusive scattering reactions using the microboone (fermilab) and clas (jlab) detectors. i will also show how such data allow addressing outstanding issues in neutrino physics such as the accuracy of incident neutrino energy reconstruction for oscillation analyses, and constraints on searches for physics beyond the standard model. | stuart jay freedman award talk: from electrons to neutrinos: nuclear effects in oscillation measurements |
genie is the world's most widely-used neutrino monte carlo generator and its physics model is employed by nearly all current and near future experiments. the collaboration developed the capability to perform global physics tuning using both the increasing body of neutrino scattering data and the vast complementary array of electron-nucleus and hadron-nucleus scattering data. this is based on a new collaboration with the professor system authors used for monte carlo generator tuning for the large hadron collider experiments, resulting in a number new physics model tunes deployed in the genie framework. the poster will describe the details of the procedure and its implementation in the newly released version of the code. | genie v3 models and global fits of neutrino scattering data |
jefferson lab has had great success using high-energy probes to significantly advance our understanding of energetic, high-density components of nuclear structure. studies of high-momentum nucleons associated with short-range correlations (srcs) have mapped out the strength and isospin dependence of these energetic components in nuclei, providing new insight into their connection to nuclear structure and the n-n interaction. studies of nuclear parton distributions and the emc effect have also shown unexpected behavior in light nuclei, and raised questions about a correlation or common origin for the emc effect and short-range correlations. it also suggests a mechanism for a flavor dependence in the emc effect for non-isoscalar nuclei, which could have significant impact on a range of other experiments at jefferson lab and in high-energy scattering and collider experiments around the world. i will highlight key insights gained from the 6 gev program at jefferson lab, discuss the potential impact on measurements of neutrino and electron scattering from nuclei and a-a, and briefly present future experiments aimed at further illuminating these exotic components of nuclear structure. supported by the u.s. doe under contract de-ac02-06ch11357. | recent insight into the structure of short-range correlations and the emc effect. |
the t2k neutrino beam is produced by colliding 30 gev protons with a graphite target, and some dark sector models predict that a dark matter candidate could be created in the collision. this massive and neutral particle could scatter off a nucleon in super-kamiokande, a 50 kilotonne water cherenkov detector. similar to the neutral-current quasielastic neutrino-oxygen interaction, the dark matter candidate could interact with the oxygen nucleus, kicking out a nucleon and leaving the nucleus in an excited state. as the nucleus deexcites, 6 mev gamma-rays are emitted which can be efficiently detected by super-kamiokande. the longer time of flight for a dark matter candidate, compared to a neutrino, allows separation between the dark matter induced signal and the neutrino induced background. in the intense global effort to measure dark matter, this complementary search investigates the sub-gev mass range where other experiments have reduced sensitivity. | a search at super-kamiokande for low mass dark matter candidates in the t2k neutrino beam |
experiments with high energy neutrino beams at cern provided early quantitative tests of the standard model. this article describes results from studies of the nucleon quark structure and of the weak current, together with the precise measurement of the weak mixing angle. these results have established a new quality for tests of the electroweak model. in addition, the measurements of the nucleon structure functions in deep inelastic neutrino scattering allowed first quantitative tests of qcd. | highlights from high energy neutrino experiments at cern |
neutrino-nucleus (νn) elastic scattering has been observed with neutrinos from decay-at-rest pions, in which the quantum-mechanical coherency effects are only partial. to probe full coherency, studies of νn scattering with lower energy neutrino sources would be necessary. we will review various projects pursuing this goal with solar (the "neutrino floor" to direct wimp searches) and reactor neutrinos, discussing their experimental challenges, status and prospects. | neutrino-nucleus coherent scattering with reactor and solar neutrinos |
the reference design of the near detector for the lbne/f experiment is a high-resolution fine-grained tracker (fgt) capable of precisely measuring all four species of neutrinos: νμ, νe, νμ and νe. the goals of the fgt is to constrain the systematic errors, below the corresponding statistical error in the far detector, for all oscillation studies; and to conduct a panoply of precision measurements and searches in neutrino physics. we present sensitivity studies - critical to constraining the systematics in oscillation searches - of measurements of the absolute and relative neutrino flux using the various techniques: 1) neutrino electron nc (cc) scattering, 2) νμ proton qe scattering, 3) coherent ρ production for absolute flux and 4) low- ν method for relative flux. | measurements of the neutrino flux using fine-grained tracker |
high intensity beams and new detectors are enabling us to gather new information about reactions of gev neutrinos on nuclei, at the transition between elastic and inelastic scattering. accurate modeling of these complex reactions will benefit greatly from this data. i will review results and capabilities of current and near future experiments, and will discuss how this data can help to sharpen the emerging picture of neutrino interactions. | experimental results on neutrino scattering |
coherent is using the intense neutrino flux produced at the spallation neutron source (sns) to investigate coherent elastic neutrino-nucleus scattering (cevns). the high energy neutrinos can induce reactions in the shielding material of cevns detectors; in particular they can excite the nucleus that will decay by emission of neutrons, producing in this way a background for the cevns signal. this reaction is also interesting in other contexts; for example it has been proposed as a detection mechanism for supernova neutrinos. the halo experiment is aiming to detect supernova neutrinos by using neutrino-induced neutrons (nins) in lead. the nin's cross section in lead is estimated theoretically only within a factor of 3 , so a careful measurement of the production cross section is of great importance. a dedicated apparatus for the measurement of nins in lead has been deployed at sns by the coherent collaboration aiming to make a precise measurement of the cross section. in these talk we will discuss the most recent results of the experiment. | measurement of the neutrino-induced neutron cross section in lead at the spallation neutron source |
coherent elastic neutrino-nucleus scattering (cenns) is a standard model process that, although predicted for decades, has only been detected recently. now that cenns has been discovered, it provides a new probe for physics beyond the standard model. we study the potential to probe new physics with cenns through the use of low temperature bolometers at a reactor source. we consider contributions to cenns due to a neutrino magnetic moment, non-standard interactions that may or may not change flavor, and simplified models containing a massive scalar or vector mediator. targets consisting of ge, zn, si, cawo _4 , and al _2 o _3 are examined. we present results demonstrating that proposed experiments using bolometers with a reactor source are well positioned to place leading bounds on nsi, and we show the improved bounds that can be placed with various combinations of target materials. | prospects for exploring new physics in coherent elastic neutrino-nucleus scattering experiments |
next generation neutrino oscillation experiments aim towards a high-precision extraction of the oscillation parameters, which in turn requires an unprecedented understanding of neutrino-nucleus interactions. charged-current quasi-elastic (ccqe) scattering is the process in which the neutrino produces a charged lepton and removes a single intact nucleon from the nucleus without produc- ing any additional particles. in the energy range most relevant for accelerator based oscillation measurements, neutrino ccqe is the dominant process. microboone is the first liquid argon time projection chamber (lartpc) commissioned as part of the short baseline neutrino (sbn) program at fermilab and its excellent particle reconstruction capabilities allow the detection of neutrino interactions using exclusive final states. this talk will present the latest progress towards the first measurement of exclusive ν µ -ar ccqe flux integrated total and differential cross-sections using data from the microboone lartpc detector. | progress towards the extraction of exclusive ν µ -ar ccqecross sections using the microboone lartpc detector |
in the scenarios of dark matter (dm) with a non-minimal dark sector, we revisit a new detection strategy of observing two or three simultaneous signals from inelastic scattering of a boosted dm [1]. the relativistically incoming dm can scatter off inelastically to a heavier unstable dark sector particle which decays back in to the dm associated with visible standard model particles inside large volume neutrino detectors. the existence of the secondary procedure renders us to separate it from conventional neutrino scattering background. the relativistically incoming dm can come from the universe by the annihilation of heavy dm component in an inelastic boosted dm scenario or produced by the beam bombardments in fixed target experiments. | non-minimal dark matter search in dark matter colliders |
neutral current resonant delta production, with subsequent radiative decay, is a standard model source of low energy single photons in many neutrino scattering experiments. these photons represent an often irreducible background in electron neutrino appearance experiments, such as in the miniboone, t2k, and nova experiments, but have never been directly measured originating from neutrino scattering. the microboone detector, with its excellent 3d spatial and calorimetric resolution, provides strong separation power between electrons and photons. in this talk, we describe ongoing work to measure these neutral current delta radiative events, both with the possibility of testing the particular hypothesis that such single photons constitute the origin of the excess of low energy electromagnetic events observed in miniboone, but also exploring microboone's ability to measure the rate of this standard model process itself. | searching for single photon emission from radiative decays of delta resonances in microboone |
core collapse supernova simulations can be sensitive to neutrino interactions near the neutrinosphere. this is the surface of last scattering. we model the neutrinosphere region as a warm unitary gas of neutrons. a unitary gas is a low density system of particles with large scattering lengths. we calculate modifications to neutrino scattering cross sections because of the universal spin and density correlations of a unitary gas. these correlations can be studied in laboratory cold atom experiments. we find significant reductions in cross sections, compared to free space interactions, even at relatively low densities. these reductions could reduce the delay time from core bounce to successful explosion in multidimensional supernova simulations. | neutrino scattering in supernovae and spin correlations of a unitary gas |
the coherent experiment at the spallation neutron source at oak ridge national lab recently observed coherent elastic neutrino nucleus scattering (cevns) at the 6.7 σ level with 14 kg of csi commissioned in june 2015. coherent is intending to measure cevns on multiple nuclei to verify the n2 dependence of the cevns cross section. to that end, the roughly 30 kg single phase liquid argon detector cenns-10 was commissioned in december 2016. cenns-10 will provide a much lighter nucleus for cevns scattering. in this talk i will present initial results of the `phase 1' liquid argon run covering dec. 2016 - may 2017 as well as a first look at `phase 2' data after an upgrade to improve the light collection efficiency was performed and additional shielding installed in summer 2017. | status of cevns search with the cenns-10 liquid argon detecor for coherent |
we present an effective theory for neutrino interactions with quarks, gluons and photons that includes operators up to dimension 7. we perform a matching of these operators into nucleon operators in order to describe low energy processes as the recently observed coherent scattering on nuclei. we compare the contribution of these new interactions with the results from coherent and charm experiments to obtain bounds on the new couplings both in the low and high energy regime. we finally review different models that can give rise to such nonstandard interactions. | eft of nonstandard neutrino interactions |
large-scale, low-threshold detectors offer the possibility to measure coherent elastic neutrino-nucleus scattering (cevns) cross-sections with high statistical precision. these measurements permit a broad collection of physics studies, such as placing improved constraints upon non-standard neutrino interactions and probing neutron distributions within nuclei. further, a large-scale detector at a spallation target provides a highly sensitive probe of accelerator-produced dark-matter. the coherent collaboration has designed a 750 kg liquid argon (lar) scintillation detector to be deployed at the spallation neutron source at oak ridge national laboratory with a 610 kg fiducial volume viewed by an array of 3-inch photo-multiplier tubes. the detector is designed to achieve the required 20 kevnr threshold needed for efficient and robust detection of nuclear recoils. in this talk, we will discuss the physics sensitivity of the detector, present the experimental design, and outline ongoing r&d to further improve scintillation light collection for future cevns studies with lar. | a tonne-scale liquid argon scintillation detector for precision cevns studies |
the musun experiment will measure the rate of muon capture on the deuteron to 1.5 % precision. this reaction is related to solar pp fusion and the nud scattering reaction at the sudbury neutrino observatory through effective field theories like chiral perturbation theory. the gamow-teller transition in all of these processes contains a single unknown low-energy constant that determines the strength of the axial coupling to the two-nucleon system. muon capture on the deuteron provides a precise and theoretically clean determination of this low-energy constant. the capture rate is determined by comparing the free muon lifetime to a 10 ppm measurement of the lifetime of negative muons stopped in a deuterium target. musun achieves this precision by tracking muons with a cryogenic time-projection chamber to ensure they stop in deuterium. this dissertation characterizes and quantifies a systematic measurement error known as fusion interference, which is a class of tracking error caused by muon-catalyzed fusion reactions following the muon stop. an efficiency difference between events with and without fusion leads to a non-exponential decay time distribution and causes a shift in the measured lifetime. the design and operation of the musun experiment and the data analysis procedures are summarized. a formalism is developed to describe the parameters of fusion interference and a correction procedure based on a specialized muon tracking algorithm is presented. | muon-catalyzed fusion effects in the precision measurement of muon capture on the deuteron |
neutrino-nucleus interaction models are needed to predict the observed neutrino energy spectrum in neutrino oscillation experiments. these models have difficulty describing neutrino scattering data in the 1-10 gev neutrino energy range in which accelerator neutrino oscillation experiments operate. this talk will detail the tuning of the neutrino interaction models used in the nova neutrino oscillation experiment using neutrino scattering data in the nova near detector. | neutrino interaction model tuning at nova |
neutrino physics is entering an age of precision measurements. a number of experiments have firmly established the existence of neutrino oscillations and determined the corresponding squared mass differences and mixing angles. these measurements have provided unambiguous evidence that neutrinos have non-vanishing masses. the large θ13 mixing angle will enable future experiments to search for leptonic cp violation in appearance mode, thus addressing one of the outstanding fundamental problems of particle physics. these searches will involve high precision determinations of the oscillation parameters, which in turn require a deep understanding of neutrino interactions with the atomic nuclei comprising the detectors. in view of the achieved and planned experimental accuracies, the treatment of nuclear effects is indeed regarded as one of the main sources of systematic uncertainty. in this context, a key role is played by the availability of a wealth of electron scattering data. in this analysis, data from the clas detector at jefferson lab have been used to test the accuracy of the neutrino energy reconstruction methods against the predictions of the commonly used genie neutrino event generator. | testing a neutrino event generator against electron scattering data |
monte carlo generators are crucial to the analysis of high energy physics data, ideally giving a baseline comparison between the state-of-art theoretical models and experimental data. presented here is a comparison between three of final state distributions from the genie, neut, nuance, and nuwro neutrino monte carlo event generators. the final state distributions chosen for comparison are: the electromagnetic energy fraction in neutral current interactions, the energy of the leading π0 vs. the scattering angle for neutral current interactions, and the muon energy vs. scattering angle of νµ charged current interactions. | comparisons of neutrino event generators from an oscillation-experiment perspective |
the goal of the musun experiment at psi is to measure the rate of muon capture on the deuteron with a precision of 1.5%. this rate will be used to fix the low-energy constant that describes the two-nucleon weak axial current in chiral perturbation theory. it will therefore calibrate evaluations of solar proton-proton fusion and neutrino-deuteron scattering(sno experiment). musun forms part of the systematic program to achieve a new level of precision in confronting the theories of weak interactions, qcd and few body physics. musun inherits some of the well developed techniques and apparatus from a successful measurement of the rate for muon capture on the proton, the mucap experiment, also performed at psi. as in mucap, musun uses a tpc as an active target. to optimize the molecular kinetics, its ultra-pure deuterium gas is kept at 31k. the status of the hardware and details of the data analysis for a high statistics run taken in 2013 will be presented. | musun: muon capture on the deuteron |
microboone is a new 170-ton liquid-argon time projection chamber located on the booster neutrino beam line at fermilab, being commissioned in 2015. using a beam of neutrinos with a mean energy of approximately 1 gev, microboone will explore neutrino oscillations, as well as measure a variety of neutrino-nucleon and neutrino-nucleus interaction cross sections in argon. one important goal is the measurement of the neutral-current elastic (nce) νp scattering cross section, νp --> νp . for q2 < 1 gev2, the nce cross section is dominated by the proton elastic axial form factor, gaz (q2) . the strangeness contribution to the axial form factor, gas (q2) , is unknown below q2 = 0 . 45 gev2, and is of great interest since the strangeness contribution to the proton spin can be determined from it: δs =gas (q2 = 0) . this talk will discuss the capability of microboone to measure gas (q2) , and present the current status of the experiment. supported by the us doe, office of science. | exploring nucleon axial structure at microboone |
charged current quasi-elastic scattering of electron neutrinos below 100 mev from 16 o nucleus is not yet observed, despite being a major component of the atmospheric neutrino signal at low energies. this channel is an important background for diffuse supernova neutrino background searches (dsnb) with inverse beta decay process in water cherenkov detectors, an additional νe detection channel in case of a supernova burst, and a possible way to probe atmospheric neutrinos at low energies that will be a background for the future wimp dark matter searches. a study for the first observation of this interaction with 20 years of super-kamiokande data is currently underway. we estimate about 60 signal events in the fiducial volume of super-kamiokande experiment and identify νe -16 o and inverse beta decay interactions from atmospheric and dsnb neutrinos as major backgrounds. we will present estimated signal and background rates, methodology and current progress of the search. | νe - 16 o interactions in super-kamiokande with low energy atmospheric neutrinos |
neutrino-nucleus interactions serve as a possible probe to study the nucleus and weak interactions. the coherent collaboration seeks to observe the n2 dependence of the coherent elastic neutrino-nucleus scattering (cevns) and continues taking data for the precision measurement of the cevns cross-section for multiple nuclei. a large effort has been dedicated to understanding backgrounds present. perhaps the most elusive is the background arising from inelastic ν-nucleus interactions in the detector shielding. inelastic ν-nucleus interactions excite a nucleus that then de-excites by particle emission. neutrino-induced neutrons (nin) are of special interest because these neutrons can interact to produce nuclear recoils that mimic nuclear recoils produced by cevns and share the same timing distribution as cevns events. the cross-section for heavy nuclei such as lead and iron is predicted to be quite large but has not been measured and theoretical calculations have large uncertainty. nin production on pb is also of interest as a proposed mechanism to observe supernova neutrinos as in the halo experiment. coherent is constructing and characterizing capture-gated neutron detectors for deployment in 980 kg of lead target to measure the inelastic neutrino-nucleus cross-section in pb208. | search for neutrino-induced neutron production in pb-208 at sns |
the coherent elastic neutrino-nucleus scattering has been observed by the coherent collaboration using a 14.6-kg csi[na] scintillator at oak ridge national laboratory. this indicates a new way to build a compact neutrino detector and unlocks new channels to test the standard model. one challenge is to understand the neutrino-induced low energy nuclear recoils. it is commonly known that the signals from nuclear recoils can be quenched in many types of detectors, resulting in less light or ionization. this phenomenon is referred to as the ``quenching factor''. it is defined as the ratio of the signal yield from the nuclear recoils to the signal yield from comparable electron recoils with the same energy. the quenching factor highly depends on the detector materials, so different detectors require their own quenching factor measurements. the next step for the coherent experiment is to use different nuclear targets e.g. ar and ge. aside from the coherent experiment, many dark matter experiments (cogent, lux, and etc.) trying to directly detect weakly interacting massive particles (wimps) also attempt to observe elastic scatterings between wimps and nuclei. in this work, we will present the quenching factor measurements for germanium detectors at tunl in the [0.8,4.9] kevnr range. | quenching factor measurements for germanium detectors at triangle universities nuclear laboratory (tunl) |
the ricochet experiment seeks to measure coherent (neutral-current) elastic neutrino-nucleus scattering (cenns) using dark matter style detectors placed near a neutrino source, possibly the mit research reactor (mitr), which offers a high continuous neutrino flux at high energies. currently, ricochet is characterizing the backgrounds at mitr. the main background is the neutrons emitted simultaneously from the core. to characterize this background, we wrapped a bonner cylinder around a 3he thermal neutron detector, whose data was then unfolded to produce a neutron energy spectrum across several orders of magnitude. we discuss the resulting spectrum as well its implications for deploying ricochet in the future. | measuring neutron spectrum at mit research reactor utilizing he-3 bonner cylinder approach with an unfolding analysis |
the extraction of neutrino mixing parameters from neutrino oscillation experiments relies on the reconstruction of the incident neutrino energy and on knowledge of the neutrino-nucleus interaction cross-section for various nuclei and a wide range of incident neutrino energies. there are a wide variety of electron scattering experiments at the thomas jefferson national accelerator facility which exploit the similarities between electrons and neutrinos to improve our knowledge of neutrino-nucleus scattering. these include measurements of quasi-elastic and deep inelastic scattering cross sections as well as measurements of incident lepton energy reconstruction techniques. this talk will present the results of these electron-scattering experiments and their impact on our knowledge of neutrino-nucleus interactions, including nuclear spectral and structure functions, short range correlations, and duality. it will also present the results of the first tests of lepton-energy reconstruction techniques. these tests found that only a small fraction of electron-scattering events could be reconstructed to the correct incident energy and that this fraction was badly predicted by event generators. including the electron-scattering results should help neutrino experiments achieve their ambitious precision goals. | electron-scattering constraints for neutrino-nucleus interactions |
the present status of neutrino cross section physics is reviewed focusing on the recent theoretical developments in quasielastic scattering, multi-nucleon contributions to the inclusive scattering and pion production on nucleons and nuclei. a good understanding of these processes is crucial to meet the precision needs of neutrino oscillation experiments. some of the challenges that arise in the consistent description of miniboone and minerva recent data are discussed. | the physics of neutrino cross sections: theoretical studies |
because quantum chromodynamics (qcd) is non-perturbative at low energies, strong interactions at the ∼ gev scale are very challenging to understand. theoretical progress has been made recently using qcd-based effective field theories (eft). the short-distance physics of the effective theory is absorbed into a limited number of low energy constants (lecs), which are determined by direct experimental measurement. the musun experiment is measuring the rate lambdad for muon capture on the deuteron, which is the simplest weak interaction in a two nucleon system. lambda d will be used, in turn, to better determine a fundamental lec known as dr in the eft. an improvement in the precision of this lec will improve our understanding of several other processes in the two-nucleon sector: pp fusion, the main source of energy in the sun and other main-sequence stars and neutrino-deuteron scattering, as observed in the sno experiment. the musun experiment determines lambdad via a precision measurement of the negative muon lifetime in deuterium. the time difference between an incoming muon, which stops in deuterium, and the subsequent decay electron characterizes the muon disappearance rate. that disappearance rate is the sum of the ordinary muon decay rate and the nuclear capture rate. the ultimate goal of the musun experiment is to determine the nuclear capture rate (lambdad) to a precision of 1.5 %, an order of magnitude improvement over previous efforts. the principal experimental development required to achieve this goal is a cryogenic (t ∼30k) time projection chamber, which not only serves as the deuterium gas target, but also provides an unambiguous measurement of muon stopping position - muons that stop in high z materials outside the fiducial deuterium volume produce a very large systematic error. the low temperature helps minimize several other systematic errors. the musun experiment is taking place at the paul scherrer institut in villigen, switzerland. over the past 5 years, the musun collaboration has staged 4 major experimental production runs. in this thesis, i present a measurement of the muon capture rate on deuterium, as determined from data taken in the summer of 2013. the estimated statistical and systematic error is about 7.5%. | a precision measurement of the rate of muon capture on the deuteron |
lariat (liquid argon in a test-beam) is a liquid argon time projection chamber (lartpc) positioned in a charged particle beamline whose primary purpose is to study the response of lartpc's to charged particle interactions. this previously unmeasured experimental data will allow for improvement of monte carlo simulations and development of identification techniques, important for future planned lartpc neutrino experiments. lariat's beamline is instrumented to allow for the identification of specific particles as well as measurement of those particles' incoming momenta. among the particles present in the beamline, the analysis presented here focuses on proton-argon interactions. this study uses particle trajectories and calorimetric information to identify proton-argon interaction candidates. we present preliminary data results on the measurement of the proton-argon cross-section. liquid argon in a test beam. the work is my analysis made possible through the efforts of lariat detector, data, and software. | proton scattering on liquid argon |
the minerνa collaboration is currently engaged in a broad program of neutrino-nucleus interaction measurements. several recent measurements of interest to the accelerator-based oscillation community are presented. these include measurements of quasi-elastic scattering, diffractive pion production, kaon production and comparisons of interaction cross sections across nuclei. a new measurement of the numi neutrino beam flux that incorporates both external hadro-production data and minerνa detector data is also presented. | recent results from minerνa |
the contribution discusses features of the 180° system at the s-dalinac its experimental program on transverse electron scattering with emphasis on topics of relevance for the description of neutrino interaction with nuclei. examples discussed include the quenching of spin-isospin modes common to vector and axial coupling and m1 strength distributions for the modeling of neutral-current neutrino-nucleus interactions. | 180° electron scattering at the s-dalinac |
the minerva (main injector experiment for v-a) experiment, operating since 2009, is a few-gev neutrino-nucleus scattering experiment in the numi beamline at fermilab. the experiment measures neutrino and anti-neutrino interactions on a variety of nuclei including plastic scintillator, lead, carbon, iron, and liquid helium. the goal of the experiment is to measure high-precision inclusive and exclusive cross sections as well as study nuclear effects to both improve the neutrino-nucleus interaction models used by neutrino oscillation experiments and to probe the nuclear medium. the current status and recent results of the experiment will be presented. | minerva status and result |
gas-based recoil tracking detectors are used in a variety of nuclear and particle physics experiments to identify particles based on distinct interaction signatures. past research shows that this technology, if further developed, may prove useful in the ongoing search for dark matter and coherent neutrino scattering observations. this research presents the original design and development of a tracking detector that uses gaseous argon as a scintillating material to measure infrared optical readout. the initial model of this detector, consisting of a wire chamber filled with p-10, has produced unambiguous ionization signals. current studies are focused toward using pure gaseous argon to detect coincident scintillation signals, which will demonstrate the capability of the detector to image particle tracks using nonvisible radiation. | infrared optical readout of a gas-based recoil tracking detector |
taking advantage of technologies which have come to maturity and the availability of a world-class pulsed neutrino source, the coherent collaboration seeks to make the first unambiguous measurement of coherent, elastic neutrino-nucleus scattering (cevns). oak ridge national laboratory's spallation neutron source is, as a by-product of the spallation process, an intense, pulsed neutrino source. the high beam power of the sns results in a high neutrino flux, and the energy spectrum of emitted neutrinos is well-suited for cevns detection: coherence is preserved in nearly all scattering events while generating nuclear recoil events above threshold for a number of established detector technologies. additionally, the pulsed nature and short duty cycle of the sns beam allow for powerful reduction of backgrounds not associated with the beam. the coherent collaboration is deploying a suite of low threshold detectors (csi[na] scintillator, high-purity ge detector array, 2-phase xe tpc) at the sns to detect cevns, in a manner that limits systematic uncertainties and observes the n2-dependence on the cross section. the current status of the efforts of the collaboration's efforts will be discussed and longer-term physics goals of the collaboration will be addressed, including searches for non-standard neutrino interactions and a measurement of the weak mixing angle. assessments of the backgrounds present in the detector locations will be discussed, including new measurements of neutrino-induced neutron production in candidate shielding materials. preliminary measurements will be presented from existing deployments, as will implementation plans for upcoming detector systems. | update and initial results from the coherent experiment |
the quantitative understanding of how the description of nuclear dynamics affects the neutrino-nucleus cross sections-needed to reduce the systematic uncertainty of long baseline neutrino oscillation experiments-involves severe difficulties. in this paper, i review the status and prospects of theoretical studies of neutrino-nucleus interactions, and briefly discuss the influence of the treatment of nuclear effects on the determination of oscillation parameters. | neutrino cross sections and oscillation parameters |
microboone is an experiment based at fermilab that uses a liquid argon time projection chamber (lartpc) to investigate the excess of low energy events observed by the miniboone experiment, study neutrino-argon cross-sections, and perform r&d for future lartpc devices. microboone relies on the reconstruction of neutrino-induced muons for neutrino energy determination. however, a significant fraction of muons escape the detector. this talk describes a method for determining the momenta of escaping muons in lartpc-based detectors. the technique uses information from multiple coulomb scattering to compute a muon's momentum through the maximization of a likelihood algorithm. this method was applied to both simulation and data, with momentum resolutions for both measured to be around 20% at typical microboone energies. given this, multiple coulomb scattering provides a promising route towards energy determination for muons that escape the detector, and allows microboone to fully reconstruct and study uncontained, often high energy, events from both the booster and numi neutrino beams. i will present the status and performance of the algorithm applied to simulation and data. | muon momentum determination with multiple coulomb scattering for the microboone experiment |
the most precise measurement of the electron neutrino mass has been obtained from the shape of the electron energy spectrum near the endpoint in tritium decay. the mainz and troitsk experiments indicated an excess instead of expected depletion of counts in that region. results derived from such measurements are subject to numerous atomic corrections which are absent in the scattering e- p ⟶ nνe. this new idea is presented in the article, with its advantages and difficulties, and is compared to the method of tritium decay. | threshold e- p⟶ nνe scattering and the electron neutrino mass |
we present a new measurement of the ionization yield in liquid xenon for nuclear recoils between 0.3 - 6 kev, directly targeting the region of interest for low-mass wimp dark matter and coherent scattering of solar or reactor neutrinos. a collimated, pulsed source of 579 kev neutrons was generated via the li(p,n)be reaction using the tandem accelerator at triangle universities nuclear laboratory. neutrons scattering elastically in the xenon target were tagged by liquid scintillator detectors at fixed angles between 15 and 70 degrees. time-of-flight and pulse shape information in the liquid scintillators provide substantial background rejection, allowing us to measure signals with a threshold at a single ionization electron. data are taken with three different electric fields applied to the liquid target. this is the lowest energy nuclear recoil calibration in liquid xenon reported to date, and can be used to interpret data and compute sensitivities of liquid-xenon-based experiments searching for coherent neutrino-nucleus scattering or low-mass wimp dark matter. | measurement of the nuclear recoil ionization yield in liquid xenon from 0.3 kev to 6 kev |
one of the primary physics goals of the deep underground neutrino experiment (dune) is measuring the electron neutrino flux from a core-collapse supernova or black hole formation. if a neutrino burst were detected, an essential piece of information would be its location. this would allow other astronomers to observe it and help determine which star collapsed, and thus its distance and history. because of the importance of locating a neutrino burst's source, the pointing resolution of dune for neutrino bursts has been calculated using simulations in this study. the pointing resolution was first calculated for single electrons, then for neutrino-electron elastic scattering events, and finally for the expected supernova signal, looking only at elastic scattering events, since this type of event has the most directional signal. using daughter tracks to help determine primary track direction was implemented and shown to improve pointing resolution. the model used in this study will be made more realistic by adding noise and the other sn neutrino interaction modes in order to accurately estimate dune's real pointing resolution for supernovae. doe. | supernova pointing resolution of dune |
the detection of coherent-neutrino nucleus scattering opens up new opportunities to probe physics beyond the standard model such as the search for a neutrino magnetic moment or sterile neutrinos. we present a novel cryogenic neutrino experiment at a nuclear power reactor which allows for precision measurements with a miniaturized detector size. with a recent demonstrator we have achieved ultra-low thresholds of 20ev, one order of magnitude lower than previous devices, using a novel type of detector based on cresst technology. we have initiated the nu-cleus experiment which aims to operate at close distance to a power reactor. a promising site about 80m away from the twin reactor cores of the chooz power plant is currently being characterized by on-site background measurements with our french collaborators at cea. this poster will report on the most recent results on the nu-cleus cryogenic detector, the ongoing background measurements at chooz and the experimental strategy of nu-cleus. | exploring coherent neutrino-nucleus scattering with nu-cleus |
minerva (main injector experiment for v-a) is a neutrino scattering experiment in fermilab's numi high-intensity neutrino beam. minerva was designed to make precision measurements of neutrino and antineutrino cross sections on a variety of materials including plastic scintillator(ch), c, fe, pb, he and water. we present a result of charged-current muon neutrino scattering on hydrocarbon (ch) at an average neutrino energy of 4.2 gev in which the final state includes a muon, at least one proton, and no pions exiting the nucleus . although this signature has the topology of neutrino quasielastic scattering from neutrons, the event sample contains contributions from both quasielastic and inelastic processes where pions are absorbed in the nucleus. | measurement of muon plus proton final states in muon neutrinos interactions on ch at 4.2 gev |
the red-100 detector has been built for observation of cevns (coherent elastic neutrino nucleus scattering) at the kalinin nuclear power plant (knpp). the red-100 is a two-phase xenon emission detector which is sensitive the extremely low ionization signals (down to single ionization electrons) in a massive target ( 100-kg in fv). this corresponds to energies < 1 kev of xe nuclear recoils. the detector has been recently tested at the mephi lab. the basic characteristics of the detector such as the single electron detection capability, the achieved purity of lxe, scintillation and electroluminescent yield, etc. are presented. shipment of the red-100 detector to knpp is planned to the end of 2018. the detector to be installed under 3000-w reactor at 19 m under the core (overburden 50 mwe, antineutrino flux 1.3 10 13cm-2s-1). other neutrino studies (setting new limits on 2 beta+ decay of 124xe, 78kr isotopes) are discussed. | the red-100 experiment on cevns study |
in searching for neutrinoless double-beta decay, it is crucial to understand backgrounds in liquid scintillator detectors for these rare events before the next generation of experiments at the kiloton-scale. with sufficient timing resolution to separate scintillation light from cherenkov radiation, it is feasible to use directionality from cherenkov light for identifying backgrounds like 8b solar neutrino scattering, which are otherwise irreducible. nudot is a preliminary 1-ton experiment aiming to demonstrate this technique of separation and event reconstruction with 1 to 2 mev beta particles. simulations for nudot are important for determining the calibration conditions, the amount of source positions needed, and the duration of runs at each position in order to obtain the precise timing calibration for cherenkov separation. for calibrating, we use water-cherenkov events from a sr90 source, and the difficulty lies in simulating the model for how cherenkov light is produced, how the pmts behave, and how light propagates through the detector. to aid this issue we use rat to simulate our experimental setup and calibration runs as closely as possible. a simulation of a timing calibration and how it compares to data collected when running in the same conditions will be shown. this work was funded by the mit summer research program. | simulations of water-cherenkov events with a sr90 source for the calibration of nudot experiment |
the nature of dark matter is one of the fundamental questions to be answered. direct dark matter searches are focussed on the development, construction, and operation of detectors looking for the scattering of weakly interactive massive particles (wimps) with target nuclei. the measurement of the direction of wimp-induced nuclear recoils is a challenging strategy to extend dark matter searches beyond the neutrino floor and provide an unambiguous signature of the detection of galactic dark matter. current directional experiments are based on the use of gas tpc whose sensitivity is strongly limited by the small achievable detector mass. newsdm is an innovative directional experiment proposal based on the use of a solid target made by newly developed nuclear emulsion films and read-out systems achieving a position accuracy of 10 nm. | directional dark matter search with the newsdm experiment |
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