First operation of undoped CsI directly coupled with SiPMs at 77 Kelvin

Keyu Ding, Jing Liu, Yongjin Yang +1

The light yield of a small undoped cesium iodide (CsI) crystal directly coupled with two silicon photomultipliers (SiPMs) at about 77~Kelvin was measured to be $43.0\pm 1.1$~photo…