Detection of Scintillation Light of Liquid Xenon with a LAAPD
  First observation of liquid xenon scintillation due to alpha-particles and gamma-rays with a large area avalanche photodiode immersed in the liquid is reported. An energy resolution of 10% (FWHM) and a coincidence time resolution of less then 1 ns (FWHM) were measured with 5.5 MeV alpha-particles and 511 keV gamma-rays, respectively. The quantum efficiency of the photodiode for xenon scintillation light (wavelength 178 nm) is estimated to be ~100%. 
V.N. Solovov, A. Hitachi, V. Chepel, M.I. Lopes, R. Ferreira Marques   and A.J.P.L. Policarpo