Paper Title:
Optimization of Positron Lifetime Spectrometer Using Monte-Carlo Simulation of the Detectors
  Abstract

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.

  Info
Periodical
Edited by
S. J. Wang, Z. Q. Chen, B. Wang and Y. C. Jean
Pages
251-253
DOI
10.4028/www.scientific.net/MSF.607.251
Citation
P. Crivelli, U. Gendotti, A. Rubbia, L. Liszkay, P. Perez, "Optimization of Positron Lifetime Spectrometer Using Monte-Carlo Simulation of the Detectors", Materials Science Forum, Vol. 607, pp. 251-253, 2009
Online since
November 2008
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$32.00
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