380 research outputs found
Antineutrino flux from the Laguna Verde Nuclear Power Plant
We present a calculation of the antineutrino flux produced by the reactors at
the Laguna Verde Nuclear Power Plant in M\'exico, based on the antineutrino
spectra produced in the decay chains of the fission fragments of the main
isotopes in the reactor core, and their fission rates, that have been
calculated using the DRAGON simulation code. We also present an estimate of the
number of expected events in a detector made of plastic scintillator with a
mass of 1 ton, at 100 m from the reactor cores.Comment: 15 pages, 8 figures, 4 table
Status of FNAL SciBooNE experiment
SciBooNE is a new experiment at FNAL which will make precision
neutrino-nucleus cross section measurements in the one GeV region. These
measurements are essential for the future neutrino oscillation experiments. We
started data taking in the antineutrino mode on June 8, 2007, and collected
5.19 \times 10^{19} protons on target (POT) before the accelerator shutdown in
August. The first data from SciBooNE are reported in this article.Comment: 3 pages, 3 figures. Proceedings of the 10th International Conference
on Topics in Astroparticle and Underground Physics (TAUP) 2007, Sendai,
Japan, September 11-15, 200
First measurement of the muon neutrino charged current quasielastic double differential cross section
A high-statistics sample of charged-current muon neutrino scattering events collected with the MiniBooNE experiment is analyzed to extract the first measurement of the double differential cross section (d(2)sigma/dT(mu)dcos theta(mu)) for charged-current quasielastic (CCQE) scattering on carbon. This result features minimal model dependence and provides the most complete information on this process to date. With the assumption of CCQE scattering, the absolute cross section as a function of neutrino energy (sigma[E-nu]) and the single differential cross section (d sigma/dQ(2)) are extracted to facilitate comparison with previous measurements. These quantities may be used to characterize an effective axial-vector form factor of the nucleon and to improve the modeling of low-energy neutrino interactions on nuclear targets. The results are relevant for experiments searching for neutrino oscillations.This work was conducted with support from Fermilab,
the U.S. Department of Energy, and the National Science
Foundation.Peer reviewe
Search for core-collapse supernovae using the MiniBooNE neutrino detector
We present a search for core-collapse supernovae in the Milky Way galaxy, using the MiniBooNE neutrino detector. No evidence is found for core-collapse supernovae occurring in our Galaxy in the period from December 14, 2004 to July 31, 2008, corresponding to 98% live time for collection. We set a limit on the core-collapse supernova rate out to a distance of 13.4 kpc to be less than 0.69 supernovae per year at 90% C. L.We acknowledge the support of Fermilab, the Department of Energy, and the National Science Foundation. We are grateful to John Beacom for his valuable insight and advice. We thank Alessandro Mirizzi, Georg G. Raffelt, and Pasquale D. Serpico for providing the probability distribution for the Milky Way.Peer reviewe
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The Neutrino Flux Prediction at MiniBooNE
The Booster Neutrino Experiment (MiniBooNE) searches for {nu}{sub {mu}} {yields} {nu}{sub e} oscillations using the {Omicron}(1 GeV) neutrino beam produced by the Booster synchrotron at the Fermi National Accelerator Laboratory (FNAL). The Booster delivers protons with 8 GeV kinetic energy (8.89 GeV=c momentum) to a beryllium target, producing neutrinos from the decay of secondary particles in the beam line. We describe the Monte Carlo simulation methods used to estimate the flux of neutrinos from the beamline incident on the MiniBooNE detector for both polarities of the focusing horn. The simulation uses the Geant4 framework for propagating particles, accounting for electromagnetic processes and hadronic interactions in the beamline materials, as well as the decay of particles. The absolute double differential cross sections of pion and kaon production in the simulation have been tuned to match external measurements, as have the hadronic cross sections for nucleons and pions. The statistical precision of the flux predictions is enhanced through reweighting and resampling techniques. Systematic errors in the flux estimation have been determined by varying parameters within their uncertainties, accounting for correlations where appropriate
Magnus Expansion and Three-Neutrino Oscillations in Matter
We present a semi-analytical derivation of the survival probability of solar
neutrinos in the three generation scheme, based on the Magnus approximation of
the evolution operator of a three level system, and assuming a mass hierarchy
among neutrino mass eigenstates. We have used an exponential profile for the
solar electron density in our approximation. The different interesting density
regions that appear throughout the propagation are analyzed. Finally, some
comments on the allowed regions in the solar neutrino parameter space are
addressed.Comment: RevTex4 style, 5 pages including 5 figures. Presented at Mexican
School of Astrophysics 2002, Guanajuato, Mexico, 31 Jul - 7 Aug 2002. Final
version to appear in the Proceedings of IX Mexican Workshop on Particles and
Fields Physics Beyond the Standard Model, Colima Col. Mexico, November 17-22,
200
Ionization efficiency for nuclear recoils in silicon from eV to MeV
We present a model for the nuclear recoil ionization efficiency in silicon
based on an extension of Lindhard's theory where atomic bond disruption is
modeled as a function of the initial ion energy, the interatomic potential, and
the average ion-vacancy production energy. A better description of the
electronic stopping than the one assumed by Lindhard, the effect of electronic
straggling, as well as charge screening and Coulomb repulsion effects of ions
are also considered. The model describes the available data over nearly four
orders of magnitude in nuclear recoil energy.Comment: 5 pages, 3 figure
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