https://doi.org/10.1140/epjc/s10052-020-8111-7
Regular Article - Experimental Physics
Prospect of undoped inorganic crystals at 77 Kelvin for low-mass dark matter search at Spallation Neutron Source
1
Department of Physics, University of South Dakota, 414 East Clark Street, Vermillion, SD, 57069, USA
2
Department of Physics, Duke University, Physics Bldg., Science Dr., Durham, NC, 27708, USA
* e-mail: Jing.Liu@usd.edu
Received:
22
January
2020
Accepted:
3
June
2020
Published online:
17
June
2020
Investigated in this work were sensitivities of a prototype detector for the detection of low-mass dark matter particles produced at the Spallation Neutron Source at the Oak Ridge National Laboratory in 2 years of data taking. The presumed prototype consisted of 10 kg undoped CsI or NaI scintillation crystals directly coupled with SiPM arrays operated at 77 K. Compared to the COHERENT CsI(Na) detector, a much higher light yield was assumed for the prototype. An experiment with a cylindrical 1 kg undoped CsI crystal coupled directly to two photomultiplier tubes at about 77 K was conducted as the first step to verify the idea. A light yield of 
photoelectrons per keV electron-equivalent was achieved. This eliminated the concern of self light absorption in large crystals raised in some of the early studies.
© The Author(s), 2020
