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observations of nuclear abundances in core-collapse supernova ejecta, highlighted by γ-ray observations of the 44ti spatial distribution in the nearby supernova remnants cas a and sn 1987a, allow nucleosynthesis calculations to place powerful constraints on conditions deep in the interiors of supernovae and their proge... | nucleosynthesis in self-consistent, multi-dimensional simulations of ccsne |
spectrum synthesis studies of the uv spectra of sharp-lined main sequence b stars provide astronomers with some of the best determinations of the abundances of the light, fe group, and neutron capture elements. b stars are therefore best-suited to study the chemical evolution of the magellanic clouds. but the hst archi... | probing supernovae chemical yields in low metallicity environments with uv spectroscopy of magellanic cloud b-type stars |
we investigate rapidly rotating, strongly magnetized core-collapse supernova (ccsn) explosions as a site for the production of heavy elements through r-process nucleosynthesis. while ccsne have long been considered a potential astrophysical site of this process explaining the origin of observed abundances for stable nu... | r-process nucleosynthesis in jet-driven core-collapse supernovae |
obtaining observations as a secondary science goal of the grb mission swift, the 30cm uvot camera has discovered a bi-modality in nuv-optical emission from the normal type ia supernovae (sneia) used as cosmological distance indicators. the bi-modality, with nuv-red (nuvr) and nuv-blue (nuvb) sne, was apparent because u... | investigating the cosmological and theoretical implications of the swift discovery of bi-modality in the uv-optical colors of normal type ia supernovae |
neutrino reactions on nuclei play important roles for the dynamics of supernovae and their associated nucleosyn-thesis. this manuscript summarizes the current status in deriving the relevant cross sections for supernova neutrinos and brielly discusses a few recent advances in supernova simulations where these reactions... | neutrino-nucleus reactions and their role in supernova dynamics and nucleosynthesis |
the distribution of abundance for iron-peak elements in dwarf spheroidal galaxies (dsphs) is important for galaxy evolution and supernova (sn) nucleosynthesis. nowadays, manganese (mn) is one of the most observed iron-peak elements in local dsphs. studies of its distributions allow us to derive and understand the evolu... | a new estimation of manganese distribution for local dwarf spheroidal galaxies |
many reactions relevant to astrophysics involve nuclei far from stability, and their cross sections must therefore be calculated numerically for input into large-scale stellar nucleosynthesis calculations. recent work, especially regarding p-process nucleosynthesis, has shown that the observed astrophysical abundances ... | sensitivity of p-nuclei abundance calculations to statistical model parameters |
we compare recent precise/reliable nebular abundances - as derived from high-quality optical spectra and the most recent icfs - in a sample of galactic planetary nebulae (pne) with nucleosynthesis predictions (hecnocl) from asymptotic giant branch (agb) aton models in the metallicity range z ⊙/4 < z < 2z ⊙. accor... | understanding galactic planetary nebulae with precise/reliable nebular abundances |
through the fusion of nucleons to produce elements heavier than hydrogen and helium, stellar nucleosynthesis produces most of the elements in the universe. such is the case in a supernova explosion, which creates most of the elements on the periodic table—including iron-peak elements, atomic numbers 21 through 30—throu... | identifying type ia supernova mechanisms in dwarf spheroidal galaxies through analysis of iron-peak elemental abundances |
the main astronomical source of r-process elements has not yet been identified. one plausible site is neutron star mergers (nsms). from the perspective of galactic chemical evolution, however, it has been pointed out that the nsm scenario is incompatible with observations. recently, tsujimoto & shigeyama (2014) poi... | chemical evolution of r-process elements in the hierarchical galaxy formation |
we have observed the local explosion environments of a sample type ic and type ic-bl supernove (sne) selected from both targeted and non-targeted surveys using vlt/vimos in ifu-mode. it is believed that by probing the local surroundings of the parent stellar populations of these types of sne, valuable information can b... | local environments of sne ic and ic-bl |
we present new eagle (``evolution and assembly of galaxies and their environments'', schaye et al. 2015) zoom simulations of a range of milky way-like galaxies that can uniquely reproduce the metallicities of galactic stars, the ism, and now the circumgalactic medium (cgm) as probed by quasar absorption line surveys. t... | the global oxygen yield budget followed in hydrodynamic simulations |
neutron star mergers (nsms) are one of the candidates for the r-process production site. because the ejected matter from the nsms is extremely neutron-rich, the nuclear fission play a essential role in the r-process. in this study we carry out r-process nucleosynthesis simulations of a neutron star merger. we here cons... | r-process in neutron star merger with a new fission model |
type ii are the most common class of the ``core collapse'' supernova, involving the destruction of a high mass star (> 8m⊙). their death is a result of a self-gravitational force becoming unbalanced as fusion ceases in the stellar core, leading to the collapse of the core to form a neutron star. the propagation of t... | nucleosynthesis in type ii supernova explosions |
p-process nucleosynthesis occurs in supernovae where the s-process seeds are present, and is responsible for the production of proton-rich nuclei. photons from sn explosions induce characteristic (γ,n), (γ,p), and (γ , α) reactions. these reactions are typically studied via the inverse reactions. for this purpose, the ... | commissioning of the high efficiency total absorption spectrometer (hector) |
sulfur isotopic ratios have the potential to distinguish presolar grains of classical novae and type ii supernovae origin. the current lack of experimentally determined 34g,mcl(p, γ)35ar reaction rates leads to large uncertainties in the production of 34s in oxygen-neon classical nova models. as a first step toward det... | discovery of 34gmcl(p, γ)35ar resonances relevant for classical nova nucleosynthesis |
the question of astrophysical site(s) for the rapid neutron capture or r process of nucleosynthesis remains one of the most challenging open problems in all of physics. neutron star mergers and core collapse supernovae are the leading candidates, but conclusions regarding both are limited by our knowledge of nuclear ph... | the rare earth peak and the astrophysical location of the r process |
in binary star systems including at least one white dwarf, the companion star may accrete mass onto the white dwarf until electron degeneracy pressure can no longer support the additional mass. a threshold is surpassed at high accretion rates, causing a stellar explosion categorized as a type ia supernova. the system u... | determining the astrophysical 20ne(boldsymbolα ,p)23na reaction rate using the notre dame 5u accelerator |
the chemical abundances of large samples of extremely metal-poor (emp) stars can be used to investigate metal-free stellar populations, supernovae, and nucleosynthesis as well as the formation and galactic chemical evolution of the milky way and its progenitor halos. however, current progress on the study of emp stars ... | the best and brightest metal-poor stars |
core-collapse supernovae (ccsne) are dramatic explosions of the massive stars at the end of their lives, which produce most of neutron stars and stellar-mass black holes in the universe. the explosions might be associated with long-duration gamma-ray bursts originating from the black hole fallback hyperaccretions or ne... | galaxy-scale contributions of black hole hyperaccretions in the center of core-collapse supernovae |
we perform a set of two-dimensional, non-relativistic, hydrodynamics simulations for supernova-like explosion associated with stellar core collapse of rotating massive stars to a system of a black hole and a disk connected by the transfer of matter and angular momentum. our model of the central engine also includes the... | variety of disk wind-driven explosions in massive rotating stars |
spin-dipole strength in 16o and ν-induced reactions on 16o are studied by shell-model calculations. charged- and neutral-current reaction cross sections for various particle and γ emission channels as well as the total ones are evaluated with the hauser-feshbach statistical method. nucleosynthesis of 11b and 11c in sup... | neutrino-nucleus reactions on oxygen and neon for nucleosynthesis and supernova neutrino detection |
we present a data-driven model for abundances of fe, sr, ba, and eu in metal-poor (mp) stars. the production patterns for core-collapse supernovae (ccsne) and binary neutron star mergers (bnsms) are derived from the data of holmbeck et al. (arxiv:2007.00749) on [sr/fe], [ba/fe], and [eu/fe] for 195 stars. nearly all th... | a data-driven model for abundances in metal-poor stars and implications for nucleosynthetic sources |
since its first-light image of cassiopeia a, chandra has revealed the in exquisite detail the complexity of supernova remnants (snrs) at x-ray wavelengths. the metals synthesized in explosions are x-ray bright for many thousands of years, and chandra has offered an up-close view of the nucleosynthetic products of snrs ... | chandra's legacy observing x-rays from supernova remnants |
the work reported in this dissertation will concern the study of kinetics, cycles and quantum mechanic processes of nuclear reactions involved in massive stars together with explosive nucleosynthesis phenomena having a key role in supernovae explosion. four main fields will be explored: physics of nuclear reaction, hyd... | astrophysical nuclear reactions: from hydrogen burning to supernovae explosions |
models of the chemical evolution of the interstellar medium, galaxies, and the universe rely on our understanding of the amounts and chemical composition of the material returned by stars and supernovae. stellar yields are obtained from stellar-evolution models, which currently lack predictive prescriptions of stellar ... | astro2020 science white paper: the fundamentals of outflows from evolved stars |
the material used to form the cemp-no stars presents signatures of material processed by the cno cycle and by he-burning from a previous stellar generation called the source stars. in order to reproduce the relative abundance ratios like for instance c/n or ^{12}c/^{13}c, some mixing between the two burning regions mus... | clues about the first stars from cemp-no stars |
nuclear clustering affects the nucleosynthesis occurring in a number of astrophysical environments. highly-clusterized nuclear states typically occur near particle thresholds and therefore can produce dramatic impacts on the nuclear reaction rates. this is especially true for astrophysical explosions that are driven by... | experiments probing clustering effects in explosive nucleosynthesis |
the milky way galaxy glows with the soft gamma ray emission resulting from the annihilation of ~5 × 1043 electron-positron pairs every second. the origin of this vast quantity of antimatter and the peculiar morphology of the 511kev gamma ray line resulting from this annihilation have been the subject of debate for almo... | sn1991bg-like supernovae are a compelling source of most galactic antimatter |
a linear [fe/h]-[o/h] relation is found for different stellar populations in the galaxy (halo, thick disk, thin disk) from a data sample obtained in a recent investigation (ramirez et al. 2013). these correlations support previous results inferred from poorer samples: stars display a "main sequence" expressed as [fe/h]... | o and fe abundance correlations and distributions inferred for the thick and thin disk |
i will discuss in detail the role of convective overshoot in the presupernova evolution and nucleosynthesis (hydrostatic and explosive) of massive stars (13-120 solar masses), with initial metallicities [fe/h]=0,-1,-2,-3, with and without rotation. | presupernova evolution and hydrstatic and explosive nucleosynthesis of massive stars: the role of convective overshoot |
stars form from the collapse and fragmentation of molecular clouds. after this first stage of formation and evolution as a pre-main-sequence object, a star begins its life in the main sequence stage through the ignition of hydrogen in its core. from here after, the life of a star is simply described as the evolution of... | introduction to the theory of stellar evolution |
the common envelop jet supernovae (cejsn) r-process scenario has been proposed as an r-process nucleosynthesis site in the past decade. jets launched by a neutron star that spirals-in inside the core of a red supergiant star in a common envelope evolution supply the proper conditions for the formation of elements heavi... | robust r-process nucleosynthesis beyond lanthanides in the common envelop jet supernovae |
rapidly rotating and strongly magnetized protoneutron stars (pnss) created in core-collapse supernovae can drive relativistic magnetized winds. ions and neutrons can be co-accelerated while they remain coupled through elastic collisions. we investigate the nucleosynthesis and subsequent nuclear disintegration, and find... | quasithermal gev neutrinos from neutron-loaded magnetized outflows in core-collapse supernovae: spectra and light curves |
one of the open questions following the discovery of gw170817 is whether neutron star mergers are the primary astrophysical sites capable of producing r-process elements. simulations have shown that r-process elements could be generated in the outflows originating from the accretion disk surrounding the rapidly rotatin... | collapsars as sites of r-process nucleosynthesis: systematic near-infrared follow-up of type ic-bl supernovae |
hd 222925 is a rare r-process enhanced star in the milky way because of its metal abundance ([fe/h] =-1.46 ± 0.10) and eu abundance ([eu/fe] = 1.32 ± 0.08). based on the very complete set of elemental abundances of hd 222925, we use the abundance decomposition method to fit the observed abundances of 58 elements in the... | a study of elemental abundance pattern of the r-ii star hd 222925 |
the abundances of about half of the elements heavier than iron are subtly attuned by the rapid neutron capture process or r-process, which is intimately related to the competition between neutron capture, photo-disintegration, and β-decay rates, and ultimately depends on the binding energy of neutron-rich nuclei. the w... | enhanced symmetry energy may bear universality of r-process abundances |
the recent detection of the live isotopes $^{60}{\rm fe}$ and $^{244}{\rm pu}$ in deep ocean sediments dating back to the past 3-4 myr poses a serious challenge to the identification of their production site(s). while $^{60}{\rm fe}$ is usually attributed to standard supernovae, actinides are r-process nucleosynthesis ... | did a kilonova set off in our galactic backyard 3.5 myr ago? |
the composition and distribution of ejecta in supernova remnants (snrs) provides crucial information on the nucleosynthesis products and explosion geometry, and therefore, can be used to probe supernova explosion mechanism and to type snrs. the type and the origin of the asymmetry of snr w49b have been a matter of deba... | asymmetric type-ia supernova origin of w49b as revealed from spatially resolved x-ray spectroscopic study |
a type ia supernova is the thermonuclear runaway of a carbon-oxygen(-neon) white dwarf. however, the detailed explosion mechanisms of type ia supernovae such as the nature of turbulent flame and details of the deflagration-detonation transition, and its evolutionary path before explosion (the single degenerate versus d... | extracting type ia supernova explosion mechanisms by their nucleosynthesis yields |
modeling the evolution of the elements in the milky way is a multidisciplinary and challenging task. in addition to simulating the 13 billion years evolution of our galaxy, chemical evolution simulations must keep track of the elements synthesized and ejected from every astrophysical site of interest (e.g., supernova, ... | the impact of nuclear physics uncertainties on galactic chemical evolution predictions |
in this work, we use non-rotating stellar models of c. west & a. heger (2018, in preparation) computed with the kepler stellar evolution, nucleosynthesis, and sn code (weaver+ 1978apj...225.1021w ; rauscher+ 2002apj...576..323r). the progenitor models were calculated using the physics setup, opacities, and nuclear ... | vizier online data catalog: nucleosynthesis of p nuclides (travaglio+, 2018) |
even though the main nucleosynthetic products of type ia supernovae belong to the iron-group, intermediate-mass alpha-nuclei (silicon, sulfur, argon, and calcium) stand out in their spectra up to several weeks past maximum brightness. recent measurements of the abundances of calcium, argon, and sulfur in type ia supern... | 16o(p,α)13n makes explosive oxygen burning sensitive to the metallicity of the progenitors of type ia supernovae |
as well as contributing to star formation, core-collapse supernovae (ccsne) are the richest astrophysical producers of heavy elements. as the explosion progresses, the evolution of the nuclear species synthesized in the early-time of the explosion is strongly coupled with the hydrodynamics. hydrodynamic instabilities, ... | extending core-collapse supernova simulations: from the onset of explosion to shock breakout |
supernova (sn) 1987a has provided a unique opportunity to study how sn ejecta evolve in 30 years time scale. we report our alma spectral observations of sn 1987a, taken in 2014, 2015 and 2016, with detections of co, 28sio, hco+ and so, with weaker lines of 29sio. we find a dip in the sio line profiles, suggesting that ... | alma observations of molecules in supernova 1987a |
we present the first submillimetre line survey of extragalactic sources carried out by apex, the results were presented inside of villicana-pedraza phd thesis in 2015. the surveys cover the 0.8 mm atmospheric window toward ngc253, ngc4945 and arp220. we found hcn, c2h, cn, cs, c34s, hco+, hnc, co, n2h+, ch3oh are prese... | submillimetric study of nearby galaxies: a tool for new extragalactic molecules |
radioactive decay of unstable atomic nuclei leads to liberation of nuclear binding energy in the forms of gamma-ray photons and secondary particles (electrons, positrons); their energy then energises surrounding matter. unstable nuclei are formed in nuclear reactions, which can occur either in hot and dense extremes of... | radioactive decay |
we propose 10 yr post-explosion uv/optical imaging of the remarkable transient sn 2009ip, in order to determine its ultimate fate. this object was discovered in a non-terminal eruption in 2009, and then appeared to explode in a much more extreme supernova (sn)-like event in 2012. a very massive (80 msun) quiescent prog... | the final word on sn 2009ip: is it dead? |
neutron-capture processes made most of the abundances of heavy elements in the solar system, however they cannot produce a number of rare proton-rich stable isotopes (p-nuclei) lying on the left side of the valley of stability. the γ-process, i.e., a chain of photodisintegrations starting on heavy nuclei, is recognized... | the γ-process nucleosynthesis in core-collapse super-novae |
our knowledge of massive star evolution and nucleosynthesis is limited by uncertainties related to multi-dimensional processes taking place in stellar interiors. recently, theoretical works have started to improve 1d stellar evolution codes through the implementation of results from 3d hydrodynamics models, which are u... | turbulence and nuclear reactions in 3d hydrodynamics simulations of massive stars |
ongoing mev telescopes such as integral/spi and fermi/gbm, and proposed telescopes including the recently accepted cosi and the e-astrogam and amego missions, provide another window in understanding transients. their signals contain information about the stellar explosion mechanisms and their corresponding nucleosynthe... | a new versatile code for gamma-ray monte-carlo radiative transfer |
the astrophysical origin of rapid neutron capture (r-process) elements has long remained a puzzle and been the object of scientific debate. neutron star (ns) mergers have historically been suggested as an ideal site for the creation of these elements, and were propelled into focus following the detection of the first b... | non-local thermodynamic equilibrium spectral modelling of kilonovae |
type ia supernovae (sn ia) are amongst the most energetic events in the universe. they are used as standard candles to measure cosmological distances and they produce a rich nucleosynthesis; they are fundamental objects to understand the chemical evolution of galaxies. it is thought that sn ia are produced by processes... | hd 74438: a young spectroscopic quadruple as a possible progenitor of supernovae ia |
we study the evolution of the europium (eu) and barium (ba) abundances in the sagittarius dwarf spheroidal galaxy by means of a one-zone chemical evolution model which includes gas infall and outflow as well as detailed stellar nucleosynthesis. we test di erent scenarios for the production of r-process material, includ... | chemical evolution of sagittarius: the heavy elements eu and ba |
i explore the possibility of estimating an upper limit for the present-day iron abundance in the baryonic matter at which the gamma-ray background from the decay of ${}^{56}$ni synthesized in the universe to date comes into conflict with the observed mev gamma-ray background. i calculate the brightness of the gamma-ray... | cosmic abundance of iron |
what the progenitors of type ia supernovae (sne ia) are, whether they are near-chandrasekhar mass or sub-chandrasekhar mass white dwarfs, has been the matter of debate for decades. various observational hints are supporting both models as the main progenitors. in this paper, we review the explosion physics and the chem... | type ia supernovae and their explosive nucleosynthesis: constraints on progenitors |
all stellar evolution models require an initial isotopic abundance set as input, but these abundances are well known only for the sun. yet, input compositions can be estimated by scaling solar abundances using a previously constructed isotopic history model based on astrophysical processes in the galaxy. this method, h... | a partial isotopic decomposition for the sculptor dsph |
this work discusses different galactic chemical evolution (gce) models and their use to decipher the evolution of stable and unstable nuclides in the galaxy. in this paper, we discuss gce models for 7li, radioactive nuclides 26al and 60fe, neutron capture elements, eu and ba, along with the impact of and the rotational... | galactic chemical evolution models for stable and short-lived nuclides |
we report on the chemical composition of the very metal-poor (vmp; [fe/h] = -2.9) star lamost j1645+4357, which was identified as a red giant having peculiar abundance ratios by li et al. the standard abundance analysis is carried out for this object and the well-studied metal-poor star hd 122563, which has similar atm... | unique chemical composition of the very metal-poor star lamost j1645+4357 |
in this paper we show how to study the chemical evolution of radioactive isotopes with a numerical model that was never used for this type of nuclei until now. in particular, we focus on the evolution of 26al and 60fe throughout the milky way, from the inner bulge to the outer boundary (0-22 kpc). our main goal is test... | chemical evolution of radioactive elements in the milky way |
despite the importance of thermonuclear or type ia supernovae (sne) as standard candles in astrophysics, the physical mechanisms behind type ia sne are still poorly constrained. theoretically, the nucleosynthetic yields from type ia sne can distinguish among different models of type ia explosions. for example, neutron-... | manganese in dwarf galaxies as a probe of type ia supernovae |
the compton spectrometer and imager (cosi) is a 0.2-5 mev compton telescope capable of performing high resolution spectroscopy and imaging of astrophysical sources. in particular, the excellent energy resolution of cosi's germanium semiconductor detectors uniquely equips it to study the mev gamma-ray line signatures of... | revealing stellar and explosive nucleosynthesis with cosi |
a major question related to the evolution of heavy element abundances during galactic evolution is whether the r-process composition as found in the solar system is coming from a unique type of astrophysical event or whether it presents a superposition of di erent contributions. up to now a neutron star merger gw170817... | sources of r-process abundances |
the far-ultraviolet (fuv) emission from old stellar systems shows a puzzlingly large factor of 100 variation in the ultraviolet-to-optical flux ratios. this effect is attributed to poorly understood differences between the underlying populations of extreme horizontal branch stars. globular clusters, which are isolated ... | a far ultraviolet study of globular clusters in ngc 3115 |
we have considered a model [e. ma and d. wegman, phys. rev. lett. 107, 061803 (2011), 10.1103/physrevlett.107.061803], where masses and a mixing pattern for neutrinos are governed by six higgs triplets and a4 symmetry. in this model we have applied a certain diagonalization procedure through which we have shown that ne... | neutrino masses and mixing angles in a model with six higgs triplets and a4 symmetry |
we consider an extended version of superconformal subcritical hybrid inflation model by introducing three right-handed neutrinos that have the majorana mass terms. in the model one of the right-handed sneutrinos plays a role of the inflaton field, and it decays to reheat the universe after inflation. the vacuum expecta... | leptogenesis after superconformal subcritical hybrid inflation |
in this paper, axion models supplemented by leptoquarks and diquarks are systematically analyzed. turning on some couplings to and among these latter states permits us to unify the peccei-quinn symmetry with baryon (b ) and lepton (l ) numbers, such that the axion becomes associated to the spontaneous breaking of the t... | leptoquarks, axions and the unification of b , l , and peccei-quinn symmetries |
we explore the possibility of generating a non-zero ue3 element of the neutrino mixing matrix from tribimaximal neutrino mixing by adding a light sterile neutrino to the active neutrinos. small active-sterile mixing can provide the necessary deviation from tribimaximal mixing to generate a non-zero θ13 and atmospheric ... | deviations in tribimaximal mixing from sterile neutrino sector |
the phenomenology of 3-neutrino mixing, the current status of our knowledge about the 3-neutrino mixing parameters, including the absolute neutrino mass scale, and of the dirac and majorana cp violation in the lepton sector are reviewed. the problems of cp violation in neutrino oscillations and of determining the natur... | theory prospective on leptonic cp violation |
we further develop a recently proposed new approach to the description of the relativistic neutrino flavour $\nu_e^l \leftrightarrow \nu_{\mu}^l$, spin $\nu_e^l \leftrightarrow \nu_{e}^r$ and spin-flavour $\nu_e^l \leftrightarrow \nu_{\mu}^r$ oscillations in a constant magnetic field that is based on the use of the exa... | neutrino oscillations and exact eigenstates in magnetic field |
we study how vacuum neutrino oscillations can be affected by a causal, nonlinear and state-dependent modification of quantum field theory that may be interpreted using the many-worlds formulation of quantum mechanics. the effect is induced by a higgs-neutrino yukawa interaction that causes a nonlinear interference betw... | out of this world neutrino oscillations |
here we present nulat (the neutrino lattice), a new detector designed to study electron anti-neutrinos a few meters from a nuclear reactor. nulat features a raghavan optical lattice (rol) and consists of 3375 boron or 6li loaded plastic scintillator cubical cells boundaries have a 0.127 mm (0.005) air gap, resulting in... | nulat: a compact, segmented, mobile anti-neutrino detector |
we have considered a model \cite{ma-weg}, where masses and a mixing pattern for neutrinos are governed by six higgs triplets and $a_4$ symmetry. in this model we have applied a certain diagonalisation procedure through which we have shown that neutrino masses can have both normal or inverted hierarchy. we have also sho... | neutrino masses and mixing angles in a model with six higgs triplets and $a_4$ symmetry |
recent stringent experiment data of neutrino oscillations induces partial symmetries such as $z_{2}$, $z_{2}\times cp$ to derive lepton mixing patterns. new partial symmetries expressed with elements of group algebras are studied. a specific lepton mixing pattern could correspond to a set of equivalent elements of a gr... | new partial symmetries from group algebras for lepton mixing |
studying the atmospheric neutrino oscillation pattern below 2gev with a multi-megaton cherenkov detector may allow for a measurement of the leptonic cp-phase. the most relevant cp-sensitive energy range is below the neutrino detection threshold of km3net/orca, which is a underwater cherenkov detector optimised for the ... | km3net/super-orca: measuring the leptonic cp-phase with atmospheric neutrinos — a feasibility study |
in the recent years, the borexino detector has proven its outstanding performances in detecting neutrinos and antineutrinos in the low energy regime. consequently, it is an ideal tool to investigate the existence of sterile neutrinos, whose presence has been suggested by several anomalies over the past two decades. the... | search for sterile neutrinos with the sox experiment |
flavour symmetries have been used to constrain both quark and lepton mixing parameters. in particular, they can be used to completely fix the mixing angles. for the lepton sector, assuming that neutrinos are majorana particles, we have derived the complete list of mixing patterns achievable in this way, as well as the ... | classification of lepton mixing patterns from finite flavour symmetries |
the coulomb enhancement of low energy electrons in nuclear beta decay generates sharp cutoffs in the accompanying antineutrino spectrum at the beta decay endpoint energies. it has been conjectured that these features will interfere with measuring the effect of a neutrino mass hierarchy on an oscillated nuclear reactor ... | reactor neutrino spectral distortions play little role in mass hierarchy experiments |
with the main injector neutrino oscillation search (minos) experiment decommissioned, muon and hadron monitors became an important diagnostic tool for the numi off-axis vμ appearance (nova) experiment at fermilab to monitor the neutrinos at the main injector (numi) beam. the goal of this study is to maintain the qualit... | numi beam monitoring simulation and data analysis |
a nuclear power reactor is the most intense man-controlled source of electron antineutrinos. an installation of a neutrino detector in close vicinity to a reactor core (~10 m) enables the study of neutrino properties with a higher efficiency, for example an investigation of short-baseline neutrino oscillations and a ve... | signal imaging from s3—80-channel detector of reactor antineutrinos |
the deep underground neutrino experiment (dune) is a next-generation long-baseline neutrino oscillation experiment which aims to measure the oscillation patterns of νμ /νe and νμ /νe over a range of energies. dune far detectors are based on liquid argon tpc (lartpc) technology. in july 2020, dune's single-phase prototy... | purity monitoring for protodune-sp |
the jiangmen underground neutrino observatory (juno) will be a 20kt liquid scintillator neutrino detector located at kaiping, jiangmen in south china. with the data aquisition starting in 2021, its main goal is the determination of the neutrino mass hierarchy from a precise measurement of the energy spectrum of anti-el... | reduction of the 14c-background in the juno experiment |
the re-analyses of the reference spectra of reactor antineutrinos together with a revised neutrino interaction cross section enlarged the absolute normalization of the predicted neutrino flux. the tension between previous reactor measurements and the new prediction is significant at 2.7 σ and is known as “reactor antin... | search for ev sterile neutrinos at a nuclear reactor — the stereo project |
the measurement of the neutrino mass ordering (nmo), i.e. the ordering of the three neutrino mass eigenstates, is a major goal of many future experiments. one strategy to measure the nmo is observing matter effects in the oscillation pattern of atmospheric neutrinos as proposed for the precision next generation upgrade... | results from testing the neutrino mass ordering with three years of icecube deepcore data |
neutrino oscillation experiments have shown that at least one neutrino has a mass greater than 50 mev. in the inverted hierarchy pattern of neutrino masses, one would expect an effective majorana neutrino mass of 15 mev or greater. this fact has led to a strong resurgence of interest in neutrinoless double beta decay e... | future challenges for double beta decay experiments |
in sharp contrast to its classical counterpart, quantum measurement plays a fundamental role in quantum mechanics and blurs the essential distinction between the measurement apparatus and the objects under investigation. an appealing phenomenon in quantum measurements, termed as quantum zeno effect, can be observed in ... | possible implications for particle physics by quantum measurement |
since the discovery of neutrino oscillations, for which takaaki kajita and arthur b. mcdonald were awarded the 2015 nobel prize in physics, tremendous progresses have been made in measuring the mixing angles which determine the oscillation pattern. a lot of theoretical efforts have been made to understand how neutrinos... | theory for neutrino mixing |
we construct a multiscalar and nonrenormalizable b - l extension of the standard model with a4 group which successfully explains the recent observed neutrino oscillation pattern. the tiny neutrino masses and their orderings are reproduced via the type-i seesaw mechanism. the model predicts co-bimaximal neutrino mixing,... | multiscalar b - l extension with a4 symmetry for fermion mass and mixing with co-bimaximal scheme |
we consider a toroidal extra-dimensional space with shape moduli $\theta$ which is the angle between the two large extra dimensions $r_1$ and $r_2$ (twisted led with $\delta=2$). the kaluza-klein (kk) compactification results in a tower of kk bulk neutrinos which are sterile in nature and couple to the active neutrinos... | effect of compactification of twisted toroidal extra-dimension on sterile neutrino |
the coulomb enhancement of low energy electrons in nuclear beta decay generates sharp cutoffs in the accompanying antineutrino spectrum at the beta decay endpoint energies. it has been conjectured that these features will interfere with measuring the effect of a neutrino mass hierarchy on an oscillated nuclear reactor ... | solving the neutrino mass hierarchy problem, despite nuclear structure |
microboone is an 85 ton active volume liquid argon time projection chamber in the booster neutrino beam at fermilab. one of microboone's major physics goals is to investigate short baseline neutrino oscillations, primarily the low energy excess of electromagnetic events observed by the miniboone experiment. the challen... | charged current electron neutrino event selection in microboone based on wire-cell 3d reconstruction algorithms |
we consider the tev scale left-right symmetric theory which can accommodate low scale seesaw mechanisms consistent with neutrino oscillation data and find new physics contributions to neutrinoless double beta decay. the model facilitates natural type-ii seesaw dominance and the presence of extra particles make the dira... | lepton number violation in low scale seesaw mechanism and its collider complementarity |
solid, located at sck-cen in mol, belgium, is a reactor antineutrino experiment at a very short baseline of 5.5 - 10m aiming at the search for sterile neutrinos and for high precision measurement of the neutrino energy spectrum of uranium-235. it uses a novel approach using lithium-6 sheets and pvt cubes as scintillato... | development & implementation of the trigger for a short-baseline reactor antineutrino experiment (solid) |
the measurement of the neutrino mass ordering (nmo), i.e. the ordering of the neutrino mass eigenstates, is one of the major goals of many future neutrino experiments. one strategy is to measure matter effects in the oscillation pattern of atmospheric neutrinos as proposed for the pingu extension of the icecube neutrin... | testing the neutrino mass ordering with four years of icecube/deepcore data |
in the present paper we develop the quantum theory of neutrino spin and spin-flavour oscillations in moving magnetized matter with a special focus on the effects of matter polarization. we derive an effective neutrino evolution hamiltonian and corresponding expressions for the neutrino oscillation probabilities. both t... | dirac and majorana neutrino oscillations in magnetized moving and polarized matter |
the reactor antineutrino energy spectra and flux were reevaluated during the preparation of the recent experiments devoted to the measurement of θ13. consequently some discrepancies between data and the theoretical predictions in reactor antineutrino experiments at short distances were observed when using the new predi... | status of the solid experiment: search for sterile neutrinos at the sck cen br2 reactor |
nova is an experiment based at fermilab that aims to learn more about neutrino oscillations. the detectors for nova use cells filled with liquid scintillator to observe energy deposited by particles produced in interaction. groupings of 32 cells connect to a single front end board, feb, where the electronics are locate... | simulating front end flash in the no νa experiment |
it is well known that the observations of neutrinoless double-beta decay prove the majorana nature of the neutrino. however, with specific values of majorana phases, the effective majorana neutrino mass to be estimated from the observation of neutrinoless double-beta decay experiments is strongly suppressed if the neut... | effective majorana neutrino mass for δl = 2 neutrino oscillations |
the juno (jiangmen underground neutrino observatory), a 20 kton multi-purpose underground liquid scintillator detector, has been proposed and approved for realization in the south of china. after an intense design phase, the overall concept of the structure of the detector has been finalized, paving the way towards the... | status and perspectives of the juno experiment |
some properties of lepton mixing and neutrino masses can be computed under the assumption of a5 and cp as a symmetry in the leptonic sector. the results show that four mixing patterns accommodate well the oscillation data, i.e. all the mixing angles are in the 3sigma confidence region. we also introduce an explicit rea... | lepton mixing and neutrino masses from a5 and cp |
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