Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 554, Issue 1-3, Pages 474-493Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2005.08.064
Keywords
ionization; modeling; simulation; gaseous detectors; PAI; relaxation
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A computer modeling of ionization is necessary for the simulation of gaseous detectors of fast charged particles. The interactions of the incident particle with matter are well described by the photoabsorption ionization (PAI) model, which is based on the relation between the energy deposited by the fast charged particle in a medium and the photoabsorption cross-section of this medium. Some modification of the PAI model energy-transfer cross-section allows to distinguish the interactions with different atomic shells and to determine the energy of the primary photoelectrons and possible atomic relaxation cascades. Further simulation of paths and absorption of secondary particles results in a realistic reproduction of the space distributions and amount of initial ionization. (c) 2005 Elsevier B.V. All rights reserved.
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