Development of a ${}^{83\mathrm{m}}$Kr source for the calibration of the CENNS-10 Liquid Argon Detector

Abstract

We report on the preparation of and calibration measurements with a ${}^{83\mathrm{m}}$Kr source for the CENNS-10 liquid argon detector. ${}^{83\mathrm{m}}$Kr atoms generated in the decay of a ${}^{83}$Rb source were introduced into the detector via injection into the Ar circulation loop. Scintillation light arising from the 9.4 keV and 32.1 keV conversion electrons in the decay of ${}^{83\mathrm{m}}$Kr in the detector volume were then observed. This calibration source allows the characterization of the low-energy response of the CENNS-10 detector and is applicable to other low-energy-threshold detectors. The energy resolution of the detector was measured to be 9$\%$ at the total ${}^{83\mathrm{m}}$Kr decay energy of 41.5 keV. We performed an analysis to separately calibrate the detector using the two conversion electrons at 9.4 keV and 32.1 keV

arXiv commentv2: As accepted to JINST

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