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

TL;DR

This paper presents the development and calibration of a $^{83}$Kr source for the CENNS-10 liquid argon detector, enabling precise low-energy response characterization crucial for neutrino detection experiments.

Contribution

The study introduces a novel $^{83}$Kr calibration source and demonstrates its effectiveness in calibrating low-energy responses of liquid argon detectors.

Findings

Achieved 9% energy resolution at 41.5 keV

Successfully observed scintillation from low-energy electrons

Calibrated detector response at multiple low energies

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