Electric field dependence of luminescence due to alpha particles in gaseous xenon and the energy expended per photon

Fluctuation of ionization, scintillation and proportional scintillation yields due to alpha-particles in gaseous xenon under normal pressures

“…5 and 6, respectively, in Ref. [21]. The rise times of the signals from the collector due to the ionization yields depend on the drift velocity of electron swarms under the electric field.…”

“…However, this is not the case for measurements of the ionization yields due to alpha-particles with a parallel plate ionization chamber (PPIC), which is used in the previous study [21] and in this study.…”

“…However, there still exists a large discrepancy between their W s -values. In addition, fluctuations of the scintillation yields in gaseous xenon have almost never been discussed [17][18][19][20][21].…”

“…In our previous study [21], we have measured scintillation yields as a function of electric field strength in order to separate excitation luminescence and recombination one, which are observed at a same time at zero electric field. In scintillation processes, the excitation luminescence is emitted through excited dimmers (Xe 2 *) which are formed from excited xenon atoms (Xe*) through three body collision with neutral xenon atoms.…”

“…Then, the excited molecules emit photons. We have measured W s -value just for the excitation luminescence in the previous study [21].…”