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Reactor neutrino physics potentials of cryogenic pure-CsI crystal

L. WangG. d. LiZ. Y. Yu ...+3 C. Gu
Dec 2022
摘要
The paper presents a world-leading scintillation light yield among inorganiccrystals measured from a 0.5 kg pure-CsI detector operated at 77 Kelvin.Scintillation photons were detected by two 2-inch Hamamatsu SiPM arraysequipped with cryogenic front end electronics. Benefiting the light yieldenhancement of pure-CsI at low temperatures and the high photon detectionefficiency of SiPM, a light yield of 52.1 photoelectrons per keV energy depositwas obtained for X-rays and {\gamma}-rays with energies from 5.9 keV to 60 keV.Instrumental and physical effects in the light yield measurement is carefullyanalyzed. This is the first stable cryogenic operation of kg-scale pure-CsIcrystal readout by SiPM arrays at liquid nitrogen temperatures for severaldays. The world-leading light yield opens a door for the usage of pure-CsIcrystal in several fields, particularly in detecting the coherent elasticneutrino-nucleus scattering of reactor neutrinos. Potentials of using pure-CsIcrystals in neutrino physics are discussed in the paper.
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