Calibration of liquid argon detector with ${}^{83m}Kr$ and ${}^{22}Na$ in different drift field

Abstract

${}^{83m}Kr$ and ${}^{22}Na$ have been used in calibrating a liquid argon (LAr) detector.${}^{83m}Kr$ atoms are produced through the decay of ${}^{83}Rb$ and introduced into the LAr detector through the circulating purification system. The light yield reaches 7.26$\pm$0.02 photonelectrons/keV for 41.5keV from ${}^{83m}Kr$ and 7.66$\pm$0.01 photonelectrons/keV for the 511keV from ${}^{22}Na$, as a comparison. The light yield varies with the drift electric field from 50 to 200V/cm have been also reported. After stopping fill, the decay rate of ${}^{83m}Kr$ with a fitted half-life of 1.83$\pm$0.11 h, which is consistent with the reported value of 1.83$\pm$0.02 h.

6 pages, 11figures, 2 tables