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Abstract
In this work we report on recent improvements in the electromagnetic (EM) physics models of Geant4 and new validations of EM physics. Improvements have been made in models of the photoelectric effect, Compton scattering, gamma conversion to electron and muon pairs, fluctuations of energy loss, multiple scattering, synchrotron radiation, and high energy positron annihilation. The results of these developments are included in the new Geant4 version 10.1 and in patches to previous versions 9.6 and 10.0 that are planned to be used for production for run-2 at LHC. The Geant4 validation suite for EM physics has been extended and new validation results are shown in this work. In particular, the effect of gamma-nuclear interactions on EM shower shape at LHC energies is discussed.
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Details
1 CERN, CH1211, Geneva 23, Switzerland
2 SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
3 Lebedev Physics Institute, 119991, Moscow, Russian Federation
4 Monash University, School of Physics, Melbourne, Australia
5 University of Tokyo, Tokyo, Japan
6 Universidad de Sevilla, Seville, Spain
7 LAPP, 74941, Annecy-le-vieux, France
8 Centre for Medical Radiation Physics, University of Wollongong, NSW, Australia
9 Université of Bordeaux 1, CNRS/IN2P3, CENBG, 33175, Gradignan, France
10 CERN, CH1211, Geneva 23, Switzerland; Ecoanalytica, 119899, Moscow, Russian Federation; Geant4 Associates International Ltd, United Kingdom
11 King Saud University, Riyadh, Saudi Arabia
12 Geant4 Associates International Ltd, United Kingdom
13 INFN-LNS, I-95123, Catania, Italy
14 Varian Medical Systems, Palo Alto, CA, 94304, USA
15 Nagoya Proton Therapy Center, Nagoya, Japan
16 Hyogo Ion Beam Medical Center, Tatsuno, Japan