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Forum: Hadronic Processes
Re: Question CHIPS pi- capture on the deuteron (Sam)
Date: 29 Mar, 2012
From: Dennis H. Wright <Dennis H. Wright>

I think what you're doing is correct and that the model is to blame. I'm not an expert on CHIPS, but I don't believe it uses the measured pi- branching ratios on deuterium. It appears only to recognize the charge exchange channel. We have recently found that the Bertini cascade model does a better job than CHIPS in many cases, so you might try it by replacing G4QStoppingPhysics with G4QandFTFStoppingPhysics in your copy of geant4/source/physics_lists/lists/include/QGSP_BIC.icc This will require you to switch to Geant4 9.5 p01 however.

Bertini has a simplified quasi-deuteron model which will probably give you the nn channel at least. The branching ratios are not used as inputs in the current code, but this seems like a good job for future improvement of Geant4 Bertini.

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