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Question Strange Secondaries from nCapture 

Forum: Hadronic Processes
Date: 22 Jul, 2016
From: <asteuer>

Hello experts,

I'm seeing strange neutron capture products when simulating hadronic cascades in ice. After long research I'm still not able to identify this process. My Detector Material is ice, composed with isotopes. I attached the most important part of the code to this post.

So I expect low energy neutrons to be mostly captured on hydrogen, forming deuterium which releases a 2.2 MeV gamma. However, the most abundant nCapture process looks like this:

   34  -2.35e+05 mm  1.41e+05 mm  1.27e+05 mm  5.15e+04 ns    0.0114 eV         0 eV  5.34e+06 nm  4.58e+08 nm       Ice   hadElastic
   35  -2.35e+05 mm  1.41e+05 mm  1.27e+05 mm  5.44e+04 ns         0 eV         0 eV  7.54e+06 nm  4.66e+08 nm       Ice     nCapture

    :----- List of secondaries ----------------
        deuteron:  energy = 0.0539 eV  time = 5.441e+04 ns  X =   -2.351e+08 um  Y =    1.408e+08 um  Z =    1.268e+08 um  Px =           -0 GeV/c  Py =            0 GeV/c  Pz =           -0 GeV/c
        deuteron:  energy =   1298 eV  time = 5.441e+04 ns  X =   -2.351e+08 um  Y =    1.408e+08 um  Z =    1.268e+08 um  Px =           -0 GeV/c  Py =            0 GeV/c  Pz =           -0 GeV/c
    :------------------------------------------

With two deuterons produced. I can neither identify what kind of nCapture this is suppose to be nor pinpoint a bug in my code. Less abundanc captures on e.g. nitrogen look ok.

Any ideas?

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/07/22/02.44-24035-DetectorConstruction.txt

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1 Idea: Re: Strange Secondaries from nCapture   (Vladimir Ivanchenko - 24 Jul, 2016)
(_ None: Re: Strange Secondaries from nCapture   (asteuer - 24 Jul, 2016)
(_ None: Re: Strange Secondaries from nCapture   (michel maire - 25 Jul, 2016)
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