publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2006-06-27 | Fe adatoms along Bi lines on H/Si(001): Patterning atomic magnetic chains | The stability, electronic and magnetic properties of Fe atoms adsorbed on the
self-assembled Bi-dimer lines nanostructure on the H/Si(001) surface are
addressed by spin-density functional calculations. Our results show that Fe
adatoms are much more stable on sites closer to the Bi nanolines being able to
form one-dimen... | 0606707v2 |
2006-08-14 | Thermal relaxation of magnetic clusters in amorphous Hf_{57}Fe_{43} alloy | The magnetization processes in binary magnetic/nonmagnetic amorphous alloy
Hf_{57}Fe_{43} are investigated by the detailed measurements of magnetic
hysteresis loops, temperature dependence of magnetization, relaxation of
magnetization and magnetic ac susceptibility, including a nonlinear term.
Blocking of magnetic mome... | 0608307v3 |
2006-09-15 | Surfactant effects in monodisperse magnetite nanoparticles of controlled size | Monodisperse magnetite Fe3O4 nanoparticles of controlled size within 6 and 20
nm in diameter were synthesized by thermal decomposition of an iron organic
precursor in an organic medium. Particles were coated with oleic acid. For all
samples studied, saturation magnetization Ms reaches the expected value for
bulk magnet... | 0609384v1 |
2006-10-18 | A new type of temperature driven reorientation transition in magnetic thin films | We present a new type of temperature driven spin reorientation transition
(SRT) in thin films. It can occur when the lattice and the shape anisotropy
favor different easy directions of the magnetization. Due to different
temperature dependencies of the two contributions the effective anisotropy may
change its sign and ... | 0610504v1 |
2006-11-09 | New ultrasmall iron-oxide nanoparticles with high magnetisation as potential T1-MRI contrast agents for Molecular Imaging | Here we report on the synthesis of very small gamma-Fe2O3 nanoparticles (5
nm) presenting very narrow particle size distribution and exceptionally high
saturation magnetisation. The synthesis has been carried out in an organic
medium with subsequent transfer to an aqueous solution at physiological pH. The
structural an... | 0611243v1 |
2006-12-10 | Substituting the main group element in cobalt - iron based Heusler alloys: Co$_2$FeAl$_{1-x}$Si$_x$ | This work reports about electronic structure calculations for the Heusler
compound Co$_2$FeAl$_{1-x}$Si$_x$. Particular emphasis was put on the role of
the main group element in this compound. The substitution of Al by Si leads to
an increase of the number of valence electrons with increasing Si content and
may be seen... | 0612241v1 |
2006-12-23 | Magnetic phase diagram of Ce2Fe17 | Rare-earth-based permanent-magnet materials rich in iron have relatively low
ferromagnetic ordering temperatures. This is believed to be due to the presence
of antiferromagnetic exchange interactions, besides the ferromagnetic
interactions responsible for the magnetic order. The magnetic properties of
Ce2Fe17 are anoma... | 0612603v1 |
2007-01-02 | Resonant soft x-ray magnetic scattering from the 4f and 3d electrons in DyFe(4)Al(8) | Soft x-ray resonant scattering has been used to examine the charge and
magnetic interactions in the cycloidal antiferromagnetic compound \dyfeal. By
tuning to the Dy $M_4$ and $M_5$ absorption edges and the Fe L(2) and L(3)
absorption edges we can directly observe the behavior of the Dy 4f and Fe 3d
electron shells. Ma... | 0701034v1 |
2007-01-26 | Use of Superparamagnetic Nanoparticle/Block Copolymer Electrostatic Complexes as Contrast Agents in Magnetic Resonance Imaging | During the past years we have investigated the complexation between
nanocolloids and oppositely charged polymers. The nanocolloids examined were
ionic surfactant micelles and inorganic oxide nanoparticles. For the polymers,
we used homopolyelectrolytes and block copolymers with linear and comb
architectures. In general... | 0701663v1 |
2007-02-23 | Spectral and Fermi surface properties from Wannier interpolation | We present an efficient first-principles approach for calculating Fermi
surface averages and spectral properties of solids, and use it to compute the
low-field Hall coefficient of several cubic metals and the magnetic circular
dichroism of iron. The first step is to perform a conventional first-principles
calculation a... | 0702554v1 |
2007-03-15 | Theoretical introduction to express way of the complex determination of the thermophysical parameters of metals | A method to measure thermophysical characteristics (TPC) of conductive
materials is described. The method is based upon controlled bulk (e.g., Ohmic)
heating and measurement of the averaged over the volume of a sample temperature
and the temperature of the surface of a sample. To measure averaged over a
sample volume t... | 0703392v2 |
1999-01-15 | The Atmospheric Neutrino Flavor Ratio from a 3.9 Fiducial Kiloton-Year Exposure of Soudan 2 | We report a measurement of the atmospheric neutrino flavor ratio, R, using a
sample of quasi-elastic neutrino interactions occurring in an iron medium. The
flavor ratio (tracks/showers) of atmospheric neutrinos in a 3.9 fiducial
kiloton-year exposure of Soudan 2 is 0.64 +- 0.11 (stat.) +- 0.06 (syst.) of
that expected.... | 9901024v1 |
1999-12-14 | Longitudinal Hadronic Shower Development in a Combined Calorimeter | This work is devoted to the experimental study of the longitudinal hadronic
shower development in the ATLAS barrel combined prototype calorimeter
consisting of the lead-liquid argon electromagnetic part and the
iron-scintillator hadronic part. The results have been obtained on the basis of
the 1996 combined test beam d... | 9912028v1 |
2000-01-05 | Search for Nucleon Decay with Final States l+ eta, nubar eta, and nubar pi+,0 Using Soudan 2 | We have searched for nucleon decay into five two-body final states using a
4.4 kiloton-year fiducial exposure of the Soudan 2 iron tracking calorimeter.
For proton decay into the fully visible final states mu+ eta and e+ eta, we
observe zero and one event, respectively, that satisfy our search criteria for
nucleon deca... | 0001015v1 |
2000-01-13 | Neutrino Oscillation Appearance Experiment using Nuclear Emulsion and Magnetized Iron | This report describes an apparatus that could be used to measure both the
identity and charge of an outgoing lepton in a charged current neutrino
interaction. This capability in a massive detector would allow the most
comprehensive set of neutrino oscillation physics measurements. By measuring
the six observable transi... | 0001035v1 |
2000-04-06 | Hadron Energy Reconstruction for the ATLAS Barrel Prototype Combined Calorimeter in the Framework of the Non-parametrical Method | Hadron energy reconstruction for the Atlas barrel prototype combined
calorimeter, consisting of the lead-liquid argon electromagnetic part and the
iron-scintillator hadronic part, in the framework of the non-parametrical
method has been fulfilled. This method uses only the known e/h ratios and the
electron calibration ... | 0004009v1 |
2001-04-02 | Hadron Energy Reconstruction for the ATLAS Calorimetry in the Framework of the Non-parametrical Method | This paper discusses hadron energy reconstruction for the ATLAS barrel
prototype combined calorimeter (consisting of a lead-liquid argon
electromagnetic part and an iron-scintillator hadronic part) in the framework
of the non-parametrical method. The non-parametrical method utilizes only the
known $e/h$ ratios and the ... | 0104002v2 |
2001-04-11 | New calibrations and time stability of the response of the INTERCAST CR-39 | We present new calibrations of different production batches (from 1989 to
1999) of the INTERCAST CR-39, using the BNL-AGS 1 A GeV iron beam. The
comparison with previous results, obtained with the 158 A GeV lead beam from
the CERN-SPS shows that, while each production batch has a different
calibration curve (mainly due... | 0104022v1 |
2001-05-22 | Extraction of R=sigma_L/sigma_T from CCFR Neutrino and Antinetrino Differential Cross Sections | We report on the extraction of R=sigam_L/sigma_T from CCFR neutrino and
antineutrino-Iron differential cross sections. R as measured in neutrno
scattering is in agreement with $R$ as measured in muon and electron
scattering. All data on R for Q2 > 1 GeV2 are in agreement with a NNLO QCD
calculation which uses NNLO PDFs... | 0105067v1 |
2002-11-07 | Design and test results of the AMS RICH detector | The AMS-02 detector will operate for at least 3 years on the International
Space Station, measuring cosmic ray spectra at about 400 km above sea level
over a wide range of geomagnetic latitude.
The proximity focusing ring imaging \v{C}erenkov counter of AMS-02 will
measure the particle velocity $\beta$ with $\approx ... | 0211018v1 |
2006-07-31 | Machine-Related Backgrounds in the SiD Detector at ILC | With a multi-stage collimation system and magnetic iron spoilers in the
tunnel, the background particle fluxes on the ILC detector can be substantially
reduced. At the same time, beam-halo interactions with collimators and
protective masks in the beam delivery system create fluxes of muons and other
secondary particles... | 0608001v1 |
1992-11-19 | Recent Work on Standard Solar Models | Recent results on standard solar models are reviewed. I shall summarize
briefly three of the themes that I stressed at the Neutrino '92 Conference: 1)
Different solar model codes give the same answers when the same input data are
used; 2) Improved calculations of standard solar models include helium
diffusion, the Live... | 9211280v1 |
1997-09-09 | Neutrino-photon reactions in astrophysics and cosmology | At energies above the threshold for $W$ production the process $\nu \gamma
\to l W^+$ is competive with $\nu \nu$ scattering at the same center of mass
energies. In a cosmological setting, absorption of ultra high energy neutrinos
by the microwave photon background is comparable to absorption by the neutrino
background... | 9709290v1 |
1997-12-07 | Off-shell Corrections and Moments of the Deep Inelastic Nuclear Structure Functions | We present an improved method for handling off-shell effects in deep
inelastic nuclear scattering. With a firm understanding of the effects of the
nuclear wave function, including these off-shell corrections as well as binding
and nucleon-nucleon correlations, we can begin to examine the role of QCD in
nuclei through a... | 9712286v1 |
1998-05-07 | Measurement of Atmospheric Neutrino Oscillations with a High-Density Detector | We propose an experiment to test the hypothesis that the reported anomaly on
atmospheric neutrino fluxes is due to nu_mu <-> nu_x oscillations. It will rely
both on a disappearance technique, exploiting the method of the dependence of
the event rate on L/E, which was recently shown to be effective for detection
of neut... | 9805249v2 |
2000-12-13 | CP-violation in 3- and 4-family at the Neutrino Factory | The leptonic CP-violating phase $\delta$ can be measured with a Neutrino
Factory with $2 \times 10^{20} $ useful muons per year, if the solar neutrino
problem is solved by the LMA-MSW solution, with $\Delta m_{12}^2 \ge 2 \times
10^{-5}$ eV$^2$ (in this analysis a 40 kT magnetized iron detector is
considered, taking in... | 0012153v1 |
2000-12-27 | Propagation of Muons and Taus at High Energies | The photonuclear contribution to charged lepton energy loss has been
re-evaluated taking into account HERA results on real and virtual photon
interactions with nucleons. With large $Q^2$ processes incorporated, the
average muon range in rock for muon energies of $10^9$ GeV is reduced by only
5% as compared with the sta... | 0012350v1 |
2001-07-27 | Extragalactic Sources for Ultra High Energy Cosmic Ray Nuclei | In this article we examine the hypothesis that the highest energy cosmic rays
are complex nuclei from extragalactic sources. Under reasonable physical
assumptions, we show that the nearby metally rich starburst galaxies (M82 and
NGC 253) can produce all the events observed above the ankle. This requires
diffusion of pa... | 0107287v4 |
2002-06-04 | The silver channel at the Neutrino Factory | We notice that looking for $\nu_e \to \nu_\tau$ at the same time as $\nu_e
\to \nu_\mu$ oscillations could significantly help to reduce the errors in the
leptonic CP-violating phase $\delta$ measurement. We show how the $\nu_e \to
\nu_\mu$ (``golden'') and $\nu_e \to \nu_\tau$ (``silver'') transitions
observed at an OP... | 0206034v1 |
2002-07-12 | Possible Studies of Parton Distribution Functions at JHF | We discuss possible studies of parton distribution functions (PDFs) in the
nucleon and nuclei at the Japan Hadron Facility (JHF). First, the PDFs could be
investigated by the 50 GeV primary proton facility. The distributions at medium
x are determined, for example, by Drell-Yan measurements. Second, there are
feasibili... | 0207151v1 |
2002-09-18 | Modified Paschos-Wolfenstein relation and extraction of weak mixing angle sin^2 theta_W | The NuTeV collaboration reported anomalously large weak mixing angle sin^2
theta_W in comparison with the standard model prediction. Neutrino and
antineutrino charged- and neutral-current events are analyzed for extracting
sin^2 theta_W. Although the Paschos-Wolfenstein relation is not directly used
in the analysis, it... | 0209200v2 |
2003-01-18 | Charge Symmetry Violating Contributions to Neutrino Reactions | The NuTeV group has measured charged and neutral current reactions for
neutrinos on iron targets. Ratios of these cross sections provide an
independent measurement of the Weinberg angle. The NuTeV value for sin^2
theta_W is three standard deviations larger than the value measured in other
electroweak processes. By revi... | 0301147v3 |
2003-05-16 | The synergy of the golden and silver channels at the Neutrino Factory | We deepen the study of the so-called ``silver channel'' $\nu_e \to \nu_\tau$
\cite{Donini:2002rm} and of its relevance to solve some of the ambiguities that
can arise in the simultaneous measurement of $(\theta_{13},\delta)$ at the
Neutrino Factory by presenting in full detail the characteristics of the
considered OPER... | 0305185v1 |
2003-06-06 | Supernova Neutrinos, Neutrino Oscillations, and the Mass of the Progenitor Star | We investigate the initial progenitor mass dependence of the early-phase
neutrino signal from supernovae taking neutrino oscillations into account. The
early-phase analysis has advantages in that it is not affected by the time
evolution of the density structure of the star due to shock propagation or
whether the remnan... | 0306056v1 |
2003-07-08 | Nuclear modification of structure functions in lepton scattering | We discuss nuclear structure functions in lepton scattering including
neutrino reactions. First, the determination of nuclear parton distribution
functions is explained by using the data of electron and muon deep inelastic
scattering and those of Drell-Yan processes. Second, NuTeV sin^2 theta_W
anomaly is discussed by ... | 0307105v1 |
2004-10-19 | Detecting matter effects in long baseline experiments | Experiments strongly suggest that the flavour mixing responsible for the
atmospheric neutrino anomaly is very close to being maximal. Thus, it is of
great theoretical as well as experimental importance to measure any possible
deviation from maximality. In this context, we reexamine the effects of matter
interactions in... | 0410266v1 |
2004-12-20 | Nuclear modification difference between u_v and d_v distributions and its relation to NuTeV sin^2 theta_W anomaly | We investigate a possible nuclear correction to the NuTeV measurement of the
weak-mixing angle sin^2 theta_W. In particular, a nuclear modification
difference between u_v and d_v distributions contributes to the NuTeV
measurement with the iron target. First, the modification differenceis
determined by a chi^2 analysis ... | 0412284v2 |
2005-11-10 | Perspectives for a neutrino program based on the upgrades of the CERN accelerator complex | In this paper, we discuss the possibilities offered to neutrino physics by
the upgrades of the CERN accelerator complex. Emphasis is on the physics reach
of a medium $\gamma$ (350-580) $\beta$-beam that fully exploits the
improvements in the CERN accelerator complex for the luminosity/energy upgrade
of the LHC. We show... | 0511134v2 |
2006-09-25 | Probing Lepton Number Violating Interactions with Beta-beams | We show that a detector placed near a beta-beam storage ring can probe lepton
number violating interactions, as predicted by supersymmetric theories with
R-parity non-conservation. In the presence of such interactions, nu_tau can be
produced during beta-decay leading to tau leptons through weak interactions.
Alternativ... | 0609252v2 |
2006-10-16 | The mass hierarchy with atmospheric neutrinos at INO | We study the neutrino mass hierarchy at the magnetized Iron CALorimeter
(ICAL) detector at India-based Neutrino Observatory with atmospheric neutrino
events generated by the Monte Carlo event generator Nuance. We judicially
choose the observables so that the possible systematic uncertainties can be
reduced. The resolut... | 0610196v3 |
2006-10-25 | Neutrino mass hierarchy and $θ_{13}$ with a magic baseline beta-beam experiment | We underscore the physics advantage of an experiment where neutrinos produced
in a beta-beam facility at CERN are observed in a large magnetized iron
calorimeter (ICAL) at the India-based Neutrino Observatory (INO). The CERN-INO
distance is close to the so-called "magic" baseline which helps evade some of
the parameter... | 0610333v2 |
2007-02-18 | A GEANT-based study of atmospheric neutrino oscillation parameters at INO | We have studied the dependence of the allowed space of the atmospheric
neutrino oscillation parameters on the time of exposure for a magnetized Iron
CALorimeter (ICAL) detector at the India-based Neutrino Observatory (INO). We
have performed a Monte Carlo simulation for a 50 kTon ICAL detector generating
events by the ... | 0702180v3 |
2007-03-20 | Neutrino hierarchy from CP-blind observables with high density magnetized detectors | High density magnetized detectors are well suited to exploit the outstanding
purity and intensities of novel neutrino sources like Neutrino Factories and
Beta Beams. They can also provide independent measurements of leptonic mixing
parameters through the observation of atmospheric muon-neutrinos. In this
paper, we disc... | 0703209v3 |
1996-08-18 | M-Theory (the Theory Formerly Known as Strings) | Superunification underwent a major paradigm shift in 1984 when
eleven-dimensional supergravity was knocked off its pedestal by ten-dimensional
superstrings. This last year has witnessed a new shift of equal proportions:
perturbative ten-dimensional superstrings have in their turn been superseded by
a new non-perturbati... | 9608117v3 |
2002-10-03 | Critical analyses of order parameter and phase transitions at high density in Gross-Neveu model | By critical analyses of the order parameter of symmetry breaking, we have
researched the phase transitions at high density in D=2 and D=3 Gross-Neveu
(GN) model and shown that the gap equation obeyed by the dynamical fermion mass
has the same effectivenesss as the effective potentials for such analyses of
all the secon... | 0210023v3 |
1999-10-18 | A high-precision polarimeter | We have built a polarimeter in order to measure the electron beam
polarization in hall C at JLAB. Using a superconducting solenoid to drive the
pure-iron target foil into saturation, and a symmetrical setup to detect the
Moller electrons in coincidence, we achieve an accuracy of <1%. This sets a new
standard for Moller... | 9910013v1 |
2002-11-25 | The Single-Particle Structure of Neutron-Rich Nuclei of Astrophysical Interest at the Ornl Hribf | The rapid nuetron-capture process (r process) produces roughly half of the
elements heavier than iron. The path and abundances produced are uncertain,
however, because of the lack of nuclear strucure information on important
neutron-rich nuclei. We are studying nuclei on or near the r-process path via
single-nucleon tr... | 0211027v1 |
2003-07-11 | Low-Q scaling, duality, and the EMC effect | High energy lepton scattering has been the primary tool for mapping out the
quark distributions of nucleons and nuclei. Data on the proton and deuteron
have shown that there is a fundamental connection between the low and high
energy regimes, referred to as quark-hadron duality. We present the results of
similar studie... | 0307012v3 |
2005-11-28 | Cosmogenic activation of Germanium and its reduction for low background experiments | Production of $^{60}$Co and $^{68}$Ge from stable isotopes of Germanium by
nuclear active component of cosmic rays is a principal background source for a
new generation of $^{76}$Ge double beta decay experiments like GERDA and
Majorana. The biggest amount of cosmogenic activity is expected to be produced
during transpo... | 0511049v1 |
2006-04-06 | Level density of $^{56}$Fe and low-energy enhancement of $γ$-strength function | The $^{55}$Mn$(d,n)^{56}$Fe differential cross section is measured at $E_d=7$
MeV\@. The $^{56}$Fe level density obtained from neutron evaporation spectra is
compared to the level density extracted from the
$^{57}$Fe$(^3$He,$\alpha\gamma)^{56}$Fe reaction by the Oslo-type technique.
Good agreement is found between the ... | 0604002v1 |
1996-01-30 | Temperature Dependence of Pair Correlations in Nuclei in the Iron-Region | We use the shell model Monte Carlo approach to study thermal properties and
pair correlations in $^{54,56,58}$Fe and in $^{56}$Cr. The calculations are
performed with the modified Kuo-Brown interaction in the complete $1p0f$ model
space. We find generally that the proton-proton and neutron-neutron $J=0$
pairing correla... | 9601047v1 |
1997-11-21 | Approximate Treatment of Lepton Distortion in Charged-Current Neutrino Scattering from Nuclei | The partial-wave expansion used to treat the distortion of scattered
electrons by the nuclear Coulomb field is simpler and considerably less
time-consuming when applied to the production of muons and electrons by low and
intermediate-energy neutrinos. For angle-integrated cross sections, however, a
modification of the ... | 9711045v1 |
1998-01-08 | Electron capture on iron group nuclei | We present Gamow-Teller strength distributions from shell model Monte Carlo
studies of fp-shell nuclei that may play an important role in the pre-collapse
evolution of supernovae. We then use these strength distributions to calculate
the electron-capture cross sections and rates in the zero-momentum transfer
limit. We ... | 9801012v1 |
1998-03-11 | Shell model calculation of the beta- and beta+ partial halflifes of 54Mn and other unique second forbidden beta decays | The nucleus 54Mn has been observed in cosmic rays. In astrophysical
environments it is fully stripped of its atomic electrons and its decay is
dominated by the beta- branch to the 54Fe ground state. Application of 54Mn
based chronometer to study the confinement of the iron group cosmic rays
requires knowledge of the co... | 9803032v1 |
2000-03-08 | Level Densities by Particle-Number Reprojection Monte Carlo Methods | A particle-number reprojection method is applied in the framework of the
shell model Monte Carlo approach to calculate level densities for a family of
nuclei using Monte Carlo sampling for a single nucleus. In particular we can
also calculate level densities of odd-even and odd-odd nuclei despite a new
sign problem int... | 0003015v1 |
2002-08-12 | Liquid-Gas Phase Transition of Supernova Matter and Its Relation to Nucleosynthesis | We investigate the liquid-gas phase transition of dense matter in supernova
explosion by the relativistic mean field approach and fragment based
statistical model. The boiling temperature is found to be high (T_{boil} >= 0.7
MeV for rho_B >= 10^{-7} fm^{-3}), and adiabatic paths are shown to go across
the boundary of c... | 0208020v1 |
2002-11-08 | Nuclear Reactions Important in Alpha-Rich Freezeouts | The alpha-rich freezeout from equilibrium occurs during the core-collapse
explosion of a massive star when the supernova shock wave passes through the
Si-rich shell of the star. The nuclei are heated to high temperature and broken
down into nucleons and alpha particles. These subsequently reassemble as the
material exp... | 0211022v1 |
2003-03-18 | Nuclear level statistics: extending the shell model theory to higher temperatures | The Shell Model Monte Carlo (SMMC) approach has been applied to calculate
level densities and partition functions to temperatures up to ~ 1.5 - 2 MeV,
with the maximal temperature limited by the size of the configuration space.
Here we develop an extension of the theory that can be used to higher
temperatures, taking i... | 0303040v1 |
2005-06-17 | Charged Lepton Production from Iron Induced by Atmospheric Neutrinos | The charged current lepton production induced by neutrinos in $^{56}Fe$
nuclei has been studied. The calculations have been done for the quasielastic
as well as the inelastic reactions assuming $\Delta$ dominance and take into
account the effect of Pauli blocking, Fermi motion and the renormalization of
weak transition... | 0506057v1 |
2005-08-13 | The nuclear moment of inertia and spin distribution of nuclear levels | We introduce a simple model to calculate the nuclear moment of inertia at
finite temperature. This moment of inertia describes the spin distribution of
nuclear levels in the framework of the spin-cutoff model. Our model is based on
a deformed single-particle Hamiltonian with pairing interaction and takes into
account f... | 0508027v1 |
2000-08-18 | An ECR hydrogen negative ion source at CEA/Saclay: preliminary results | The development of a high intensity negative ion source is part of a
considerably larger activity presently undergoing at CEA Saclay in the field of
high intensity linear accelerators. Preliminary studies toward the construction
of a 2.45 GHz ECR H- ion source have been performed for few months. This new
test bench tak... | 0008143v1 |
2003-05-09 | The particle-in-cell model for ab initio thermodynamics: implications for the elastic anisotropy of the Earth's inner core | We assess the quantitative accuracy of the particle-in-cell (PIC)
approximation used in recent ab initio predictions of the thermodynamic
properties of hexagonal-close-packed iron at the conditions of the Earth's
inner core. The assessment is made by comparing PIC predictions for a range of
thermodynamic properties wit... | 0305033v2 |
2004-11-19 | New applications of Equinox code for real-time plasma equilibrium and profile reconstruction for tokamaks | Recent development of real-time equilibrium code Equinox [1] using a
fixed-point algorithm [2] allow major plasma magnetic parameters to be
identified in real-time, using rigorous analytical method. The code relies on
the boundary flux code providing flux values on the first wall of vacuum
vessel. By means of least-squ... | 0411181v1 |
2006-01-04 | Simulation Studies of Delta-ray Backgrounds in a Compton-Scatter Transition Radiation Detector | In order to evaluate the response to cosmic-ray nuclei of a Compton-Scatter
Transition Radiation Detector in the proposed ACCESS space-based mission, a
hybrid Monte Carlo simulation using GEANT3 and an external transition radiation
(TR) generator routine was constructed. This simulation was employed to study
the effect... | 0601020v1 |
2006-11-22 | Efficient Degradation and Expression Prioritization with Small RNAs | We build a simple model for feedback systems involving small RNA (sRNA)
molecules based on the iron metabolism system in the bacterium E. coli, and
compare it with the corresponding system in H. pylori which uses purely
transcriptional regulation. This reveals several unique features of sRNA based
regulation that could... | 0611069v3 |
2007-04-06 | Millimeter-Thick Single-Walled Carbon Nanotube Forests: Hidden Role of Catalyst Support | A parametric study of so-called "super growth" of single-walled carbon
nanotubes(SWNTs) was done by using combinatorial libraries of iron/aluminum
oxide catalysts. Millimeter-thick forests of nanotubes grew within 10 min, and
those grown by using catalysts with a thin Fe layer (about 0.5 nm) were SWNTs.
Although nanotu... | 0704.0915v1 |
2007-04-11 | Physical parameters of evolved stars in clusters and in the field from line-depth ratios | We present a high-resolution spectroscopic analysis of two samples of evolved
stars selected in the field and in the intermediate-age open cluster IC 4651,
for which detailed measurements of chemical composition were made in the last
few years. Applying the Gray's method based on ratios of line depths, we
determine the... | 0704.1462v1 |
2007-04-13 | Spectrum of cosmic rays, produced in supernova remnants | Nonlinear kinetic theory of cosmic ray (CR) acceleration in supernova
remnants is employed to calculate CR spectra. The magnetic field in SNRs is
assumed to be significantly amplified by the efficiently accelerating nuclear
CR component. It is shown that the calculated CR spectra agree in a
satisfactory way with the ex... | 0704.1715v1 |
2007-04-16 | Single pion electro-- and neutrinoproduction on heavy targets | We present a calculation of single pion electroproduction cross sections on
heavy targets in the kinematic region of the Delta(1232) resonance. Final state
interactions of the pions are taken into account using the pion multiple
scattering model of Adler, Nussinov and Paschos (ANP model). For
electroproduction and neut... | 0704.1991v1 |
2007-04-17 | Maximum Entropy for Gravitational Wave Data Analysis: Inferring the Physical Parameters of Core-Collapse Supernovae | The gravitational wave signal arising from the collapsing iron core of a Type
II supernova progenitor star carries with it the imprint of the progenitor's
mass, rotation rate, degree of differential rotation, and the bounce depth.
Here, we show how to infer the gravitational radiation waveform of a core
collapse event ... | 0704.2157v2 |
2007-05-09 | Quark-nova explosion inside a collapsar: application to Gamma Ray Bursts | If a quark-nova occurs inside a collapsar, the interaction between the
quark-nova ejecta (relativistic iron-rich chunks) and the collapsar envelope,
leads to features indicative of those observed in Gamma Ray Bursts. The
quark-nova ejecta collides with the stellar envelope creating an outward moving
cap
(Gamma ~ 1-10... | 0705.1240v3 |
2007-05-17 | Applications of nanoparticles of gamma Fe2O3 for hyperthermia in E.coli by Nd:YAG laser | The paper explores the use of nanoparticles of gamma Fe2O3 for hyperthermia
treatment of living organisms by absorption of 1064 nm radiations from Nd:YAG
laser. Escherichia coli cells have been used as the model system for
demonstrating the effect wherein lysine is used as an interface between the
cell walls and the na... | 0705.2523v1 |
2007-05-21 | Room temperature spin polarized magnetic semiconductor | Alternating layers of granular Iron (Fe) and Titanium dioxide
(TiO$_{2-\delta}$) were deposited on (100) Lanthanum aluminate (LaAlO$_3$)
substrates in low oxygen chamber pressure using a controlled pulsed laser
ablation deposition technique. The total thickness of the film was about 200
nm. The films show ferromagnetic... | 0705.2993v1 |
2007-05-30 | Epitaxial thin films of multiferroic Bi2FeCrO6 with B-site cationic order | Epitaxial thin films of Bi2FeCrO6 have been synthesized by pulsed laser
deposition on SrRuO3 on (100)- and (111)-oriented SrTiO3 substrates. Detailed
X-ray diffraction and cross-section transmission electron microscopy analysis
revealed a double perovskite crystal structure of the Bi2FeCrO6 epitaxial films
very similar... | 0705.4390v1 |
2007-06-04 | Sum-rules for electron energy-loss near-edge spectra | We derive four sum-rule expressions for spectra measured in electron
energy-loss near edge structure experiments. These sum-rules permit the
determination spin and orbital magnetic moments, spin-orbit interaction and
number of states, analogously to the sum rules of x-ray magnetic circular
dichroism. The derivation of ... | 0706.0402v2 |
2007-06-14 | Molecular opacities for low-mass metal-poor AGB stars undergoing the Third Dredge Up | The concomitant overabundances of C, N and s-process elements are commonly
ascribed to the complex interplay of nucleosynthesis, mixing and mass loss
taking place in Asymptotic Giant Branch stars. At low metallicity, the
enhancement of C and/or N may be up to 1000 times larger than the original iron
content and signifi... | 0706.2100v1 |
2007-06-18 | The Spectrum of the Black Hole X-ray Nova V404 Cygni in Quiescence as Measured by XMM-Newton | We present XMM observations of the black hole X-ray nova V404 Cygni in
quiescence. Its quiescent spectrum can be best fitted by a simple power-law
with slope 2. The spectra are consistent with that expected for the
advection-dominated accretion flow (ADAF). V404 Cyg was roughly equal in
luminosity compared to the previ... | 0706.2652v1 |
2007-06-20 | Optical spectroscopy of RU Cam, a pulsating carbon star | We analysed the high resolution spectra of a RU Cam, classified as W Vir type
star. The atmospheric parameters of RU Cam were estimated Teff=5250K and log
g=1.0. The hydrogen deficiency of RU Cam was not confirmed. The iron abundance,
[Fe/H]=-0.37, is close to the solar one. Abundances of most other elements are
also c... | 0706.2969v1 |
2007-06-20 | Neutrino-driven explosions twenty years after SN1987A | The neutrino-heating mechanism remains a viable possibility for the cause of
the explosion in a wide mass range of supernova progenitors. This is
demonstrated by recent two-dimensional hydrodynamic simulations with detailed,
energy-dependent neutrino transport. Neutrino-driven explosions were not only
found for stars i... | 0706.3056v1 |
2007-07-18 | Charge Order Superstructure with Integer Iron Valence in Fe2OBO3 | Solution-grown single crystals of Fe2OBO3 were characterized by specific
heat, Mossbauer spectroscopy, and x-ray diffraction. A peak in the specific
heat at 340 K indicates the onset of charge order. Evidence for a doubling of
the unit cell at low temperature is presented. Combining structural refinement
of diffraction... | 0707.2743v1 |
2007-07-27 | Magnetic Field Generation in Planets and Satellites by Natural Nuclear Fission Reactors | One of the most fundamental problems in physics has been to understand the
nature of the mechanism that generates the geomagnetic field and the magnetic
fields of other planets and satellites. For decades, the dynamo mechanism,
thought to be responsible for generating the geomagnetic field and other
planetary magnetic ... | 0707.4161v4 |
2007-08-01 | Abundances on the Main Sequence of Omega Centauri | Abundance ratios of carbon, nitrogen and strontium relative to iron,
calculated using spectrum synthesis techniques, are given for a sample of main
sequence and turnoff stars that belong to the globular cluster omega Centauri.
The variations of carbon, nitrogen and/or strontium show several different
abundance patterns... | 0708.0096v1 |
2007-08-01 | The 4th Concept Detector for the International Linear Collider | The 4th Concept detector presently being designed for the International
Linear Collider introduces several innovations in order to achieve the
necessary experimental goal of a detecter that is 2-to-10 times better than the
already excellent SLC and LEP detectors. We introduce a dual-readout
calorimeter system, a cluste... | 0708.0142v2 |
2007-08-01 | First-principles thermal equation of state and thermoelasticity for hcp Fe under high pressures | We investigate the equation of state and elastic properties of nonmagnetic
hcp iron at high pressures and high temperatures using the first principles
linear response linear-muffin-tin-orbital method in the generalized-gradient
approximation. We calculate the Helmholtz free energy as a function of volume,
temperature, ... | 0708.0183v1 |
2007-08-03 | Strong spin-orbit induced Gilbert damping and g-shift in iron-platinum nanoparticles | The shape of ferromagnetic resonance spectra of highly dispersed, chemically
disordered Fe_{0.2}Pt_{0.8} nanospheres is perfectly described by the solution
of the Landau-Lifshitz-Gilbert (LLG) equation excluding effects by crystalline
anisotropy and superparamagnetic fluctuations. Upon decreasing temperature, the
LLG d... | 0708.0463v1 |
2007-08-06 | Emission Lines in X-ray Spectra of Clusters of Galaxies | Emission lines in X-ray spectra of clusters of galaxies reveal the presence
of heavy elements in the diffuse hot plasma (the Intra Cluster Medium, or ICM)
in virial equilibrium in the dark matter potential well. The relatively simple
physical state of the ICM allows us to estimate, with good accuracy, its
thermodynamic... | 0708.0674v1 |
2007-08-29 | A Deep Chandra Observation of Kepler's Supernova Remnant: A Type Ia Event with Circumstellar Interaction | We present initial results of a 750 ks Chandra observation of the remnant of
Kepler's supernova of AD 1604. The strength and prominence of iron emission,
together with the absence of O-rich ejecta, demonstrate that Kepler resulted
from a thermonuclear supernova, even though evidence for circumstellar
interaction is als... | 0708.3858v1 |
2007-08-31 | Stellar Models and Yields of Asymptotic Giant Branch Stars | We present stellar yields calculated from detailed models of low and
intermediate-mass asymptotic giant branch (AGB) stars. We evolve models with a
range of mass from 1 to 6Msun, and initial metallicities from solar to 1/200th
of the solar metallicity. Each model was evolved from the zero age main
sequence to near the ... | 0708.4385v2 |
2007-09-03 | X-ray reflection in accreting stellar-mass black hole systems | The X-ray spectra of accreting stellar-mass black hole systems exhibit
spectral features due to reflection, especially broad iron K alpha emission
lines. We investigate the reflection by the accretion disc that can be expected
in the high/soft state of such a system. First, we perform a self-consistent
calculation of t... | 0709.0270v1 |
2007-09-21 | Self-assembly of polymers or copolymers and ferrofluids leading to either 1-d, 2-d or 3-d aggregates decorated with magnetic nanoparticles | A novel type of hybrid colloids is presented, based on the association of
several polymeric systems and ferrofluids. On the one hand, we use inorganic
nanoparticles made of magnetic iron oxide prepared at the LI2C, which response
to a magnetic field of low intensity. On the other hand the organic part is
made either of... | 0709.3514v1 |
2007-09-25 | The Burst Spectra of EXO 0748-676 during a Long 2003 XMM-Newton Observation | Gravitationally redshifted absorption lines from highly ionized iron have
been previously identified in the burst spectra of the neutron star in EXO
0748-676. To repeat this detection we obtained a long, nearly 600 ks
observation of the source with XMM-Newton in 2003. The spectral features seen
in the burst spectra fro... | 0709.4062v1 |
2007-10-10 | The control of iron oxidation state during FeO and olivine crystal growth | Crystal growth experiments (micro-pulling down or Czochralski methods,
respectively) and DTA/TG measurements with Fe2+ containing olivines
(fayalite--forsterite solid solution) and with FeO (wustite) are performed. For
both substances the oxygen partial pressure p_O2 of the growth atmosphere had
to be adjusted within t... | 0710.2050v1 |
2007-10-11 | RXTE confirmation of the Intermediate Polar status of Swift J0732.5-1331 | Aims. We intend to establish the X-ray properties of Swift J0732.5-1331 and
therefore confirm its status as an intermediate polar. Method. We analysed
36,240 s of X-ray data from RXTE. Frequency analysis was used to constrain
temporal variations and spectral analysis used to characterise the emission and
absorption pro... | 0710.2248v1 |
2007-10-23 | NGC3147: a "true" Seyfert 2 without the broad-line region | We report on simultaneous optical and X-ray observations of the Seyfert
galaxy, NGC3147. The XMM-Newton spectrum shows that the source is unabsorbed in
the X-rays ($N_H<5\times10^{20}$ cm$^{-2}$). On the other hand, no broad lines
are present in the optical spectrum. The origin of this optical/X-rays
misclassification ... | 0710.4226v1 |
2007-10-24 | Magnetic tight-binding and the iron-chromium enthalpy anomaly | We describe a self consistent magnetic tight-binding theory based in an
expansion of the Hohenberg-Kohn density functional to second order, about a non
spin polarised reference density. We show how a first order expansion about a
density having a trial input magnetic moment leads to the Stoner--Slater rigid
band model.... | 0710.4399v1 |
2007-10-25 | Ocean Planet or Thick Atmosphere: On the Mass-Radius Relationship for Solid Exoplanets with Massive Atmospheres | The bulk composition of an exoplanet is commonly inferred from its average
density. For small planets, however, the average density is not unique within
the range of compositions. Variations of a number of important planetary
parameters--which are difficult or impossible to constrain from measurements
alone--produce pl... | 0710.4941v1 |
2007-10-31 | XMM-Newton Detection of a Compton-thick AGN in the 1-Jy ULIRG/LINER F04103-2838 | We report on the detection of Fe Kalpha emission in F04103$-$2838, an
ultraluminous infrared galaxy (ULIRG; log[L$_{\rm IR}$/L$_\odot$] $\ge$ 12)
that is optically classified as a LINER. Previous {\it Chandra} observations
suggested the presence of both a starburst and an AGN in this source. A deeper
($\sim$20 ksec) {\... | 0711.0002v1 |
2007-11-01 | Magnetic resonance in iron oxide nanoparticles: quantum features and effect of size | In order to better understand the transition from quantum to classical
behavior in spin system, electron magnetic resonance (EMR) is studied in
suspensions of superparamagnetic magnetite nanoparticles with an average
diameter of ~ 9 nm and analyzed in comparison with the results obtained in the
maghemite particles of s... | 0711.0168v1 |
2007-11-07 | Ultrahigh energy cosmic rays as heavy nuclei from cluster accretion shocks | Large-scale accretion shocks around massive clusters of galaxies, generically
expected in hierarchical scenarios of cosmological structure formation, are
shown to be potential sources of the observed ultrahigh energy cosmic rays
(UHECRs) by accelerating a mixture of heavy nuclei including the iron group
elements. Curre... | 0711.1027v1 |
2007-11-12 | Low temperature dephasing in irradiated metallic wires | We present phase coherence time measurements in quasi-one-dimensional Ag
wires implanted with Ag$^{+}$ ions with an energy of $100 keV$. The
measurements have been carried out in the temperature range from $100 mK$ up to
$10 K$; this has to be compared with the Kondo temperature of iron in silver,
i.e. $T_{K}^{Ag/Fe} \... | 0711.1810v2 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.