Optimization of positron lifetime spectrometer using Monte-Carlo simulation of the detectors
In this paper, we present the Monte-Carlo simulation that we developed and used to design and to interpret the data of a new kind of lifetime spectrometer especially constructed for the determination of the ortho-positronium (o-Ps) re-emission yield from thin mesoporous silica films. The main issue was to have the detection efficiency independent of the o-Ps re-emission energy. This was done in order to avoid a bias of the results related to the positron implantation energy. Furthermore, the simulation is used to calculate the detection efficiencies for annihilation events yielding 2 and 3 gamma photons allowing a precise evaluation of the absolute yield of o-Ps produced in the samples. Calculations were performed using the GEANT4 package. New classes were written to describe the different decay types related to the Ps formation in matter. Moreover, the propagation and interaction of the o-Ps reemitted in a vacuum cavity were also included in the simulation.
Geant4 Monte-Carlo simulation PALS spectrometer ortho-positronium
P.Crivelli U.Gendotti A.Rubbia L.Liszkay P.Perez
Institut für Teilchenphysik,ETHZ,CH-8093 Zürich,Switzerland CEA Saclay,IRFU,91191 Gif-sur-Yvette Cedex,France
国际会议
第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)
武汉
英文
251-253
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）