Gallium neutrino absorption cross section and its uncertainty

Elliott, S. R.; Gavrin, V. N.; Haxton, W. C.; Ibragimova, T. V.; Rule, E. J.

doi:10.1103/PhysRevC.108.035502

Gallium neutrino absorption cross section and its uncertainty

Journal Article · Mon Sep 25 00:00:00 EDT 2023 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.108.035502· OSTI ID:2938348

^[1]; Gavrin, V. N. ^[2]; ^[3]; Ibragimova, T. V. ^[2]; ^[4]

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Russian Academy of Sciences (RAS), Moscow (Russian Federation)
University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
University of California, Berkeley, CA (United States)

In the recent Baksan Experiment on Sterile Transitions (BEST), a suppressed rate of neutrino absorption on a gallium target was observed, consistent with earlier results from neutrino source calibrations of the SAGE and GALLEX/GNO solar neutrino experiments. The BEST Collaboration, utilizing a 3.4 MCi ⁵¹Cr neutrino source, found observed-to-expected counting rates at two very short baselines of 𝑅 = 0.791 ± 0.05 and 0.766 ± 0.05, respectively. Among recent neutrino experiments, BEST is notable for the simplicity of both its neutrino spectrum, line neutrinos from an electron-capture source whose intensity can be measured to a estimated precision of 0.23%, and its absorption cross section, where the precisely known rate of electron capture to the gallium ground state, ⁷¹Ge ⁢(𝑒−, 𝜈_𝑒)⁢ ⁷¹Ga ⁢(g.s.), establishes a minimum value. However, the absorption cross section uncertainty is a common systematic in the BEST, SAGE, and GALLEX/GNO neutrino source experiments. Here, in this work, we update that cross section, considering a variety of electroweak corrections and the role of transitions to excited states, to establish both a central value and reasonable uncertainty, thereby enabling a more accurate assessment of the statistical significance of the gallium anomalies. Results are given for ⁵¹Cr and ³⁷Ar sources. The revised neutrino capture rates are used in a reevaluation of the BEST and gallium anomalies.

View Accepted Manuscript (DOE)

Research Organization:: University of California, Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0004658; SC0015376; AC02-05CH11231

OSTI ID:: 2938348

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 108; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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