|Message: Re: CHIPS pi- capture on the deuteron||Not Logged In (login)|
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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
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.