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Question Differences in the Binary Cascade Model 

Forum: Hadronic Processes
Date: 10 Nov, 2016
From: Ulrich Stiegler <Ulrich Stiegler>

In 2011 I did shielding calculation with geant4-09-05-beta-01, physics list QGSP_BIC_HP 1.3. Now I repeat the calculation with geant4-10-02-patch-01, QGSP_BIC_HP 2.0. I use a proton beam with 4.7 GeV. Behind a shielding of 3 m soil (density 1.8 g/cm3) I observe a large difference between the two geant versions. The neutron and photon flux in the transverse direction is for the new version a factor 10 higher. For a proton beam with 19 MeV there is no difference. At 100 MeV the difference is large but smaller then at 4.7 GeV. I did the calculation with and without importance sampling and I observed the same difference between the two geant versions. I guess the difference comes from changes in the BIC-model. Of course, a difference in the cross section of a view per cent adds up to around a factor 2 for 1 m soil and a factor 10 for 3 m soil. My question is what was changed in the BIC-model and why? Beyond 9.5 GeV there was a change in the model between the two versions (LEP -> FTF) but my proton energy is well below 9.5 GeV. Therefore this change should not affect my result.

Thank you for an answer, Uli

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