Performance of a Large Area Avalanche Photodiode in a Liquid Xenon Ionization and Scintillation Chamber

Details Performance of a Large Area Avalanche Photodiode in a Liquid Xenon Ionization and Scintillation Chamber Performance of a Large Area Avalanche Photodiode in a Liquid Xenon Ionization and Scintillation Chamber

2005-02-14

arxiv.org/abs/physics/0502071v1

Nucl.Instrum.Meth. A551 (2005) 356-363

Physics

Instrumentation and Detectors

13 pages, 8 figures

Scientific paper

10.1016/j.nima.2005.06.054

Scintillation light produced in liquid xenon (LXe) by alpha particles, electrons and gamma-rays was detected with a large area avalanche photodiode (LAAPD) immersed in the liquid. The alpha scintillation yield was measured as a function of applied electric field. We estimate the quantum efficiency of the LAAPD to be 45%. The best energy resolution from the light measurement at zero electric field is 7.5%(sigma) for 976 keV internal conversion electrons from Bi-207 and 2.6%(sigma) for 5.5 MeV alpha particles from Am-241. The detector used for these measurements was also operated as a gridded ionization chamber to measure the charge yield. We confirm that using a LAAPD in LXe does not introduce impurities which inhibit the drifting of free electrons.

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