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Thank you, Bradley for useful information. It turns out that Geant4 v10 has several Coulomb scattering models. It might be worth checking it out as well. Takashi -----Original Message----- From: Bradley T Yale [mailto:[log in to unmask]] Sent: Wednesday, October 14, 2015 11:04 AM To: Maruyama, Takashi; Solt, Matthew Reagan Cc: hps-software Subject: Large-Angle FEE Discrepancy in MC Concerning what I mentioned in the meeting about how egs5 handles multiple scattering by default: Page 91 (109 of the attached pdf) describes how the default Moliere distribution breaks down for large angles and high Z, and page 367 (385 of the attached pdf) gives the flag for using the Goudsmit-Saunderson instead. Figure 2 of http://www2.cose.isu.edu/~tforest/Classes/NucSim/Day7/MSC_Fernandez_NIM_B73_pg447-473_1993.pdf <http://www2.cose.isu.edu/~tforest/Classes/NucSim/Day7/MSC_Fernandez_NIM_B73_pg447-473_1993.pdf> Shows the large-angle difference between Moliere and G-S for lower energy and an Au target, so there could be a similar effect for us. I started to try out the G-S distribution a while back in /u/group/hps/production/mc/egs5/src/esa-carbon-GS.inp but decided not to alter things to that extent. Maybe it would be worth trying for this purpose though. ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1