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Question CHIPS pi- capture on the deuteron 

Forum: Hadronic Processes
Date: 21 Mar, 2012
From: Sam <Sam>

Hello,

I am trying to simulate the capture of pi-s on deuterium and in particular I am looking at the two reactions:

pi- + d -> 2n pi- + d -> 2n + g and the less likely pi- +d -> 2n + pi0

However, when I try to keep track of how often it implements these reactions I do not see what I expect. After ~5 million pi- starting in a deuterium target I never see the 2n+ g reaction and I rarely see the 2n reaction. I expect to see branching ratios of 75% for the 2n reaction 25% for the 2n +g reaction and 10^-4 for the 2n+pi0 reaction. These reactions seem overwhelmed with the reactions off the proton where there are only 2 body final states and the only 3 body final state reaction I see is the less likely pi- +d -> 2n + pi0 reaction. Information about the branching ratios for these reactions can be seen at http://arxiv.org/pdf/nucl-ex/0701001v1.pdf Table 1.

Does CHIPS know how to do the pi- + d -> 2n + g reaction? Is there something special that I need to do in order to see it?

Information about my set up:

Physics list: QGSP_BIC Geant4 version: geant4.9.4.p01

I am keeping track of which reaction is being invoked by looking at the secondaries made in each step and looking for the right mix of secondary particles.

Thank you,

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1 None: Re: CHIPS pi- capture on the deuteron   (Dennis H. Wright - 29 Mar, 2012)
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