Search for electron-neutrino transitions to sterile states in the BEST experiment

Barinov, V. V.; Danshin, S. N.; Gavrin, V. N.; Gorbachev, V. V.; Gorbunov, D. S.; Ibragimova, T. V.; Kozlova, Yu. P.; Kravchuk, L. V.; Kuzminov, V. V.; Lubsandorzhiev, B. K.; Malyshkin, Yu. M.; Mirmov, I. N.; Shikhin, A. A.; Veretenkin, E. P.; Cleveland, B. T.; Ejiri, H.; Elliott, S. R.; Kim, I.; Massarczyk, R.; Frekers, D.; Haxton, W. C.; Matveev, V. A.; Trubnikov, G. V.; Nico, J. S.; Petelin, A. L.; Tarasov, V. A.; Zvir, A. I.; Robertson, R. G. H.; Sinclair, D.; Wilkerson, J. F.

doi:10.1103/PhysRevC.105.065502

Search for electron-neutrino transitions to sterile states in the BEST experiment

Journal Article · Thu Jun 09 00:00:00 EDT 2022 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.105.065502· OSTI ID:2925172

Barinov, V. V. ^[1]; Danshin, S. N. ^[1]; Gavrin, V. N. ^[1]; Gorbachev, V. V. ^[1]; Gorbunov, D. S. ^[1]; Ibragimova, T. V. ^[1]; Kozlova, Yu. P. ^[1]; Kravchuk, L. V. ^[1]; Kuzminov, V. V. ^[1]; Lubsandorzhiev, B. K. ^[1]; Malyshkin, Yu. M. ^[1]; Mirmov, I. N. ^[1]; Shikhin, A. A. ^[1]; Veretenkin, E. P. ^[1]; Cleveland, B. T. ^[2]; Ejiri, H. ^[3]; Elliott, S. R. ^[4]; ^[4]; Massarczyk, R. ^[4]; Frekers, D. ^[5] more »

Russian Academy of Sciences (RAS), Moscow (Russian Federation)
SNOLAB, Sudbury, ON (Canada)
Osaka Univ. (Japan)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Westfälische Wilhelms-Universität Münster (Germany)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
JSC State Scientific Center Research Institute of Atomic Reactors (Russian Federation)
Univ. of Washington, Seattle, WA (United States)
Carleton Univ., Ottawa, ON (Canada)
University of North Carolina, Chapel Hill, NC (United States); Triangle Universities Nuclear Laboratory (TUNL), Durham, NC (United States)

The Baksan Experiment on Sterile Transitions (BEST) probes the gallium anomaly and its possible connections to oscillations between active and sterile neutrinos. Based on the Gallium-Germanium Neutrino Telescope (GGNT) technology of the SAGE experiment, BEST employs two zones of liquid Ga target to explore neutrino oscillations on the meter scale. Oscillations on this short scale could produce deficits in the ⁷¹Ge production rates within the two zones, as well as a possible rate difference between the zones. From July 5th to October 13th 2019, the two-zone target was exposed to a primarily monoenergetic, 3.4-MCi ⁵¹Cr neutrino source 10 times for a total of 20 independent ⁷¹Ge extractions from the two Ga targets. The ⁷¹Ge production rates from the neutrino source were measured from July 2019 to March 2020. At the end of these measurements, the counters were filled with ⁷¹Ge doped gas and calibrated during November 2020. In this paper, results from the BEST sterile neutrino oscillation experiment are presented in details. The ratio of the measured ⁷¹Ge production rates to the predicted rates for the inner and the outer target volumes are calculated from the known neutrino capture cross section. Comparable deficits in the measured ratios relative to predicted values are found for both zones, with the 4⁢𝜎 deviations from unity consistent with the previously reported gallium anomaly. Finally, if interpreted in the context of neutrino oscillations, the deficits give best-fit oscillation parameters of Δ⁢𝑚² = 3.3$$^{+∞}{−2.3}$$ eV² and sin²⁡2⁢𝜃 = 0.42$$^{+0.15}{−0.17}$$, consistent with 𝜈_𝑒→𝜈_𝑠 oscillations governed by a surprisingly large mixing angle.

View Accepted Manuscript (DOE)

Research Organization:: Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory; Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of North Carolina, Chapel Hill, NC (United States); University of California, Berkeley, CA (United States)

Sponsoring Organization:: Federal Agency of Science Organizations (FASO); Ministry of Education and Science of the Russian Federation; ROSATOM of Russia; USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC). Office of Nuclear Physics (NP)

Grant/Contract Number:: 89233218CNA000001; FG02-97ER41033; FG02-97ER41041; SC0004658

OSTI ID:: 2925172

Alternate ID(s):: OSTI ID: 1880501
OSTI ID: 1907283
OSTI ID: 1907687

Report Number(s):: LA-UR-22-20028

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 105; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Search for electron-neutrino transitions to sterile states in the BEST experiment

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