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Average Numbers of Scintillation Photons and Electrons Produced by an Alpha Particle in High-Density Xenon Gas

Mitsuteru Mimura, Shingo Kobayashi, Naoki Masuyama, Mitsuhiro Miyajima, and Nobuyuki Hasebe

Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan

(Received June 23, 2008; revised February 21, 2009; accepted March 30, 2009; published online July 21, 2009)

The average numbers of scintillation photons and electrons produced by an α-particle with 5.49 MeV were determined in high-density xenon gas in the density range of 0.03–0.12 g/cm3. No significant density dependence was observed for the number of excited atoms or liberated electrons. The average energies expended per excited atom (Wex-value) and liberated electron (W-value) were found to be 34.1±2.4 and 20.9±0.4 eV, respectively. It was also found that some liberated electrons escape from recombination at zero electric field.

URL: http://jjap.jsap.jp/link?JJAP/48/076501/
DOI: 10.1143/JJAP.48.076501


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