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Question Discrepancies between cascade model results in Geant4 10.2 and 10.3 

Forum: Hadronic Processes
Date: 01 Jun, 2017
From: Peter Kunz <Peter Kunz>

Hello, a simulation of 480 MeV protons on uranium using the Liege cascade (QGSP_INCLXX) in combination with the ABLA V3 produced a peculiar cluster of extremely neutron-rich isotopes (see attached figure) in the latest Geant4 10.3 version. It doesn't show up using the same code in 10.2. The same effect is observed with the Bertini cascade (QGSP_BERT_HP). Production cross-sections are as high as 0.4 mbarn for Lu-194, for example. That's 3 orders of magnitude higher the most neutron-rich isotopes (about 15 neutrons less than Lu-194) which can realistically be produced by fragmentation. I wonder if someone can tell me if this result is based on some new reaction cross-section data or just a bug.

Thanks, Peter

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/06/01/11.28-65716-ton_INCL-ABLA_41589e5.png

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