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Title: Weak Magnetism Correction to Allowed Beta-decay for Reactor Antineutrino Spectra

Abstract

The weak magnetism correction and its uncertainty to nuclear β decay play a major role in determining the significance of the reactor neutrino anomaly. Here in this paper, we examine the common approximation used for one-body weak magnetism in the calculation of fission antineutrino spectra, wherein matrix elements of the orbital angular-momentum operator contribution to the magnetic-dipole current are assumed to be proportional to those of the spin operator. Although we find this approximation invalid for a large set of nuclear structure situations, we conclude that it is valid for the relevant allowed β decays between fission fragments. In particular, the uncertainty in the fission antineutrino due to the uncertainty in the one-body weak magnetism correction is found to be less than 1%. Thus, the dominant uncertainty from weak magnetism for reactor neutrino fluxes lies in the uncertainty in the two-body meson-exchange magnetic-dipole current.

Authors:
 [1]; ORCiD logo [2]
  1. Huzhou Univ., Huzhou (China). School of Science
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1460644
Alternate Identifier(s):
OSTI ID: 1364079
Report Number(s):
LA-UR-17-21424
Journal ID: ISSN 2469-9985
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic and Nuclear Physics; Reactor; Neutrino

Citation Formats

Wang, Xiabao B., and Hayes-Sterbenz, Anna Catherine. Weak Magnetism Correction to Allowed Beta-decay for Reactor Antineutrino Spectra. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.95.064313.
Wang, Xiabao B., & Hayes-Sterbenz, Anna Catherine. Weak Magnetism Correction to Allowed Beta-decay for Reactor Antineutrino Spectra. United States. doi:10.1103/PhysRevC.95.064313.
Wang, Xiabao B., and Hayes-Sterbenz, Anna Catherine. Thu . "Weak Magnetism Correction to Allowed Beta-decay for Reactor Antineutrino Spectra". United States. doi:10.1103/PhysRevC.95.064313. https://www.osti.gov/servlets/purl/1460644.
@article{osti_1460644,
title = {Weak Magnetism Correction to Allowed Beta-decay for Reactor Antineutrino Spectra},
author = {Wang, Xiabao B. and Hayes-Sterbenz, Anna Catherine},
abstractNote = {The weak magnetism correction and its uncertainty to nuclear β decay play a major role in determining the significance of the reactor neutrino anomaly. Here in this paper, we examine the common approximation used for one-body weak magnetism in the calculation of fission antineutrino spectra, wherein matrix elements of the orbital angular-momentum operator contribution to the magnetic-dipole current are assumed to be proportional to those of the spin operator. Although we find this approximation invalid for a large set of nuclear structure situations, we conclude that it is valid for the relevant allowed β decays between fission fragments. In particular, the uncertainty in the fission antineutrino due to the uncertainty in the one-body weak magnetism correction is found to be less than 1%. Thus, the dominant uncertainty from weak magnetism for reactor neutrino fluxes lies in the uncertainty in the two-body meson-exchange magnetic-dipole current.},
doi = {10.1103/PhysRevC.95.064313},
journal = {Physical Review C},
number = 6,
volume = 95,
place = {United States},
year = {Thu Jun 15 00:00:00 EDT 2017},
month = {Thu Jun 15 00:00:00 EDT 2017}
}

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