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Light yield of cryogenic CsI down to 5.9 keV

ORAL

Abstract

We measured the light yield of an undoped cryogenic CsI scintillator at four energies including the first measurement at 5.9 keV that is close to the detector threshold. A light yield of 33.4 ± 1.7 photoelectrons per keV electron-equivalent (PE/keV_ee) was achieved with an undoped CsI crystal coupled with a photomultiplier tube (PMT) at 77 Kelvin using the 5.9 keV X-ray from Fe-55 source and a light yield of 40.0 ± 2.0 PE/keV_ee was observed from the 59.5 keV γ-ray from an Am-241 source. Analysis procedures and reconstruction methods will be presented.

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Publication: J. Liu, M. Yamashita, and A. K. Soma. Light yield of an undoped CsI crystal coupled directly to a photomultiplier tube at 77 Kelvin. J. Inst., 11(10):P10003, 2016. <br>Prospect of undoped inorganic crystals at 77 Kelvin for low-mass dark matter search at Spallation Neutron Source Dmitry Chernyak, Daniel Pershey, Jing Liu, Keyu Ding, Nathan Saunders, and Tupendra Oli, Eur. Phys. J. C, 80(6):547 (2020).<br>Light yield of cold undoped CsI crystal down to 13 keV and the application of such crystals in neutrino detection Keyu Ding, Dmitry Chernyak, and Jing Liu, Eur. Phys. J. C, 80(12):1146, 2020.<br>First operation of undoped CsI directly coupled with SiPMs at 77 Kelvin Keyu Ding, Jing Liu, Yongjin Yang, and Dmitry Chernyak, Eur. Phys. J. C, 82(4):344, 2022.<br>The COHERENT Experimental Program COHERENT Collaboration, arXiv: 2204.04575<br>Planned paper: <br>Light yield of an undoped CsI crystal at 77 Kelvin down to 5.9 keV<br>Light yield of undoped CsI directly coupled with coated SiPMs at 77 Kelvin

Presenters

  • Keyu Ding

    University of South Dakota

Authors

  • Keyu Ding

    University of South Dakota