Kavli Affiliate: Masaki Yamashita
| First 5 Authors: Jing Liu, Masaki Yamashita, Arun Kumar Soma, ,
| Summary:
A light yield of 20.4 $pm$ 0.8 photoelectrons/keV was achieved with an
undoped CsI crystal coupled directly to a photomultiplier tube at 77 Kelvin.
This is by far the largest yield in the world achieved with CsI crystals. An
energy threshold that is several times lower than the current dark matter
experiments utilizing CsI(Tl) crystals may be achievable using this technique.
Together with novel CsI crystal purification methods, the technique may be used
to improve the sensitivities of dark matter and coherent elastic
neutrino-nucleus scattering experiments. Also measured were the scintillation
light decay constants of the undoped CsI crystal at both room temperature and
77 Kelvin. The results are consistent with those in the literature.
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