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