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Title: Improved calculations of β decay backgrounds to new physics in liquid xenon detectors

Abstract

We present high-precision theoretical predictions for the electron energy spectra for the ground-state to ground-state β decays of 214Pb, 212Pb, and 85Kr most relevant to the background of liquid xenon dark matter detectors. The effects of nuclear structure on the spectral shapes are taken into account using large-scale shell-model calculations. Final spectra also include atomic screening and exchange effects. The impact of nuclear structure effects on the 214 Pb and 212Pb spectra below ≈ 100 keV, pertinent for several searches for new physics, are found to be comparatively larger than those from the atomic effects alone. We find that the full calculation for 214Pb (212Pb) predicts 15.0%–23.2% (12.1%–19.0%) less event rate in a 1–15 keV energy region of interest compared to the spectrum calculated as an allowed transition when using values of the weak axial vector coupling in the range gA = 0.7 –1.0. The discrepancy highlights the importance of both a proper theoretical treatment and the need for direct measurements of these spectra for a thorough understanding of β decay backgrounds in future experiments.

Authors:
ORCiD logo; ; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1735395
Alternate Identifier(s):
OSTI ID: 1810783
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Physical Review C
Additional Journal Information:
Journal Name: Physical Review C Journal Volume: 102 Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; beta decay; electroweak interactions in nuclear physics; nuclear structure & decay

Citation Formats

Haselschwardt, S. J., Kostensalo, J., Mougeot, X., and Suhonen, J.. Improved calculations of β decay backgrounds to new physics in liquid xenon detectors. United States: N. p., 2020. Web. https://doi.org/10.1103/PhysRevC.102.065501.
Haselschwardt, S. J., Kostensalo, J., Mougeot, X., & Suhonen, J.. Improved calculations of β decay backgrounds to new physics in liquid xenon detectors. United States. https://doi.org/10.1103/PhysRevC.102.065501
Haselschwardt, S. J., Kostensalo, J., Mougeot, X., and Suhonen, J.. Fri . "Improved calculations of β decay backgrounds to new physics in liquid xenon detectors". United States. https://doi.org/10.1103/PhysRevC.102.065501.
@article{osti_1735395,
title = {Improved calculations of β decay backgrounds to new physics in liquid xenon detectors},
author = {Haselschwardt, S. J. and Kostensalo, J. and Mougeot, X. and Suhonen, J.},
abstractNote = {We present high-precision theoretical predictions for the electron energy spectra for the ground-state to ground-state β decays of 214Pb, 212Pb, and 85Kr most relevant to the background of liquid xenon dark matter detectors. The effects of nuclear structure on the spectral shapes are taken into account using large-scale shell-model calculations. Final spectra also include atomic screening and exchange effects. The impact of nuclear structure effects on the 214 Pb and 212Pb spectra below ≈ 100 keV, pertinent for several searches for new physics, are found to be comparatively larger than those from the atomic effects alone. We find that the full calculation for 214Pb (212Pb) predicts 15.0%–23.2% (12.1%–19.0%) less event rate in a 1–15 keV energy region of interest compared to the spectrum calculated as an allowed transition when using values of the weak axial vector coupling in the range gA = 0.7 –1.0. The discrepancy highlights the importance of both a proper theoretical treatment and the need for direct measurements of these spectra for a thorough understanding of β decay backgrounds in future experiments.},
doi = {10.1103/PhysRevC.102.065501},
journal = {Physical Review C},
number = 6,
volume = 102,
place = {United States},
year = {2020},
month = {12}
}

Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/PhysRevC.102.065501

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