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Title: The {sup 8}B neutrino spectrum

Abstract

Knowledge of the energy spectrum of {sup 8}B neutrinos is important for interpreting experiments that detect energetic neutrinos from the Sun. The neutrino spectrum deviates from the allowed {beta}-decay approximation because of the broad {alpha}-unstable {sup 8}Be final state and recoil order corrections. We have measured the total energy of the {alpha} particles emitted following the {beta} decay of {sup 8}B. The measured {alpha} spectrum is inconsistent with a recent measurement of comparable precision. The {alpha} spectrum is fit using the R-matrix approach, which gives a functional form for the {beta}-decay strength function for the transition from {sup 8}B to the accessible excitation energies in {sup 8}Be. Both the positron and neutrino energy spectra, corrected for recoil order effects, are constructed from the strength function. The positron spectrum is in good agreement with a previous direct measurement. The neutrino spectrum disagrees with previous experiments.

Authors:
 [1];  [2]; ;  [3]
  1. Nuclear Science Division, Lawrence Berkeley National Laboratory, California 94720 (United States)
  2. Physics Department, University of California, Berkeley, California 94720 (United States)
  3. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
20771297
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.73.025503; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA DECAY; ALPHA PARTICLES; ALPHA SPECTRA; APPROXIMATIONS; BERYLLIUM 8; BETA DECAY; BORON 8; CORRECTIONS; COSMIC NEUTRINOS; ENERGY SPECTRA; EXCITATION; ION EMISSION; POSITRONS; R MATRIX; RECOILS; SOLAR NEUTRINOS; STRENGTH FUNCTIONS

Citation Formats

Winter, W.T., Freedman, S.J., Rehm, K.E., and Schiffer, J.P. The {sup 8}B neutrino spectrum. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.025503.
Winter, W.T., Freedman, S.J., Rehm, K.E., & Schiffer, J.P. The {sup 8}B neutrino spectrum. United States. doi:10.1103/PhysRevC.73.025503.
Winter, W.T., Freedman, S.J., Rehm, K.E., and Schiffer, J.P. Wed . "The {sup 8}B neutrino spectrum". United States. doi:10.1103/PhysRevC.73.025503.
@article{osti_20771297,
title = {The {sup 8}B neutrino spectrum},
author = {Winter, W.T. and Freedman, S.J. and Rehm, K.E. and Schiffer, J.P.},
abstractNote = {Knowledge of the energy spectrum of {sup 8}B neutrinos is important for interpreting experiments that detect energetic neutrinos from the Sun. The neutrino spectrum deviates from the allowed {beta}-decay approximation because of the broad {alpha}-unstable {sup 8}Be final state and recoil order corrections. We have measured the total energy of the {alpha} particles emitted following the {beta} decay of {sup 8}B. The measured {alpha} spectrum is inconsistent with a recent measurement of comparable precision. The {alpha} spectrum is fit using the R-matrix approach, which gives a functional form for the {beta}-decay strength function for the transition from {sup 8}B to the accessible excitation energies in {sup 8}Be. Both the positron and neutrino energy spectra, corrected for recoil order effects, are constructed from the strength function. The positron spectrum is in good agreement with a previous direct measurement. The neutrino spectrum disagrees with previous experiments.},
doi = {10.1103/PhysRevC.73.025503},
journal = {Physical Review. C, Nuclear Physics},
number = 2,
volume = 73,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}