A1 Journal article (refereed)
Feasibility and physics potential of detecting 8B solar neutrinos at JUNO (2021)

JUNO Collaboration. (2021). Feasibility and physics potential of detecting 8B solar neutrinos at JUNO. Chinese Physics C, 45(2), Article 023004. https://doi.org/10.1088/1674-1137/abd92a

JYU authors or editors

Publication details

All authors or editors: JUNO Collaboration

Journal or series: Chinese Physics C

ISSN: 1674-1137

eISSN: 2058-6132

Publication year: 2021

Volume: 45

Issue number: 2

Article number: 023004

Publisher: IOP Publishing

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1088/1674-1137/abd92a

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/74430

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2006.11760

Abstract

The Jiangmen Underground Neutrino Observatory (JUNO) features a 20 kt multi-purpose underground liquid scintillator sphere as its main detector. Some of JUNO's features make it an excellent location for B-8 solar neutrino measurements, such as its low-energy threshold, high energy resolution compared with water Cherenkov detectors, and much larger target mass compared with previous liquid scintillator detectors. In this paper, we present a comprehensive assessment of JUNO's potential for detecting B solar neutrinos via the neutrino-electron elastic scattering process. A reduced 2 MeV threshold for the recoil electron energy is found to be achievable, assuming that the intrinsic radioactive background U-238 and Th-232 in the liquid scintillator can be controlled to 10(-17) g/g. With ten years of data acquisition, approximately 60,000 signal and 30,000 background events are expected. This large sample will enable an examination of the distortion of the recoil electron spectrum that is dominated by the neutrino flavor transformation in the dense solar matter, which will shed new light on the inconsistency between the measured electron spectra and the predictions of the standard three-flavor neutrino oscillation framework. If Delta m(21)(2) = 4.8 x 10(-5) (7.5 x 10(-5)) eV(2), JUNO can provide evidence of neutrino oscillation in the Earth at approximately the 3 sigma(2 sigma) level by measuring the non-zero signal rate variation with respect to the solar zenith angle. Moreover, JUNO can simultaneously measure Delta m(21)(2) using B-8 solar neutrinos to a precision of 20% or better, depending on the central value, and to sub-percent precision using reactor antineutrinos. A comparison of these two measurements from the same detector will help understand the current mild inconsistency between the value of Delta m(21)(2) reported by solar neutrino experiments and the KamLAND experiment.

Keywords: particle physics; nuclear physics; neutrinos; neutrino oscillation; research equipment; detectors

Free keywords: solar neutrino; JUNO

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2021

Preliminary JUFO rating: 1