Spatially uniform calibration of a liquid xenon detector at low energies using {sup 83m}Kr
- Physik-Institut, Universitaet Zuerich, Zuerich 8057 (Switzerland)
- Nuclear Physics Institute, Academy of Sciences of the Czech Republic, CZ 250 68 Rez near Prague (Czech Republic)
A difficult task with many particle detectors focusing on interactions below {approx}100 keV is to perform a calibration in the appropriate energy range that adequately probes all regions of the detector. Because detector response can vary greatly in various locations within the device, a spatially uniform calibration is important. We present a new method for calibration of liquid xenon (LXe) detectors, using the short-lived {sup 83m}Kr. This source has transitions at 9.4 and 32.1 keV, and as a noble gas like Xe, it disperses uniformly in all regions of the detector. Even for low source activities, the existence of the two transitions provides a method of identifying the decays that is free of background. We find that at decreasing energies, the LXe light yield increases, while the amount of electric field quenching is diminished. Additionally, we show that if any long-lived radioactive backgrounds are introduced by this method, they will present less than 67x10{sup -6} events kg{sup -1} day{sup -1} keV{sup -1} in the next generation of LXe dark matter direct detection searches.
- OSTI ID:
- 22053780
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 7 Vol. 81; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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