Physics – Instrumentation and Detectors
Scientific paper
2007-08-20
JINST 3:P02001,2008
Physics
Instrumentation and Detectors
7 pages submitted to NIM A
Scientific paper
10.1088/1748-0221/3/02/P02001
While developing a liquid argon detector for dark matter searches we investigate the influence of air contamination on the VUV scintillation yield in gaseous argon at atmospheric pressure. We determine with a radioactive alpha-source the photon yield for various partial air pressures and different reflectors and wavelength shifters. We find for the fast scintillation component a time constant tau1= 11.3 +- 2.8 ns, independent of gas purity. However, the decay time of the slow component depends on gas purity and is a good indicator for the total VUV light yield. This dependence is attributed to impurities destroying the long-lived argon excimer states. The population ratio between the slowly and the fast decaying excimer states is determined for alpha-particles to be 5.5 +-0.6 in argon gas at 1100 mbar and room temperature. The measured mean life of the slow component is tau2 = 3.140 +- 0.067 microsec at a partial air pressure of 2 x 10-6 mbar.
Amsler Claude
Boccone Vittorio
Buchler A.
Chandrasekharan R.
Regenfus Christian
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