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Question G4NeutronRadCapture produces incorrect secondary particles 

Forum: Hadronic Processes
Date: 14 Oct, 2016
From: <adamrouh>

I am trying to simulate neutron activation of Li6: n + Li6 -> H3 + alpha + Q(4.78 MeV).

If the material the neutron hits is either G4_LITHIUM_IODIDE or a user-defined material of LiI, a gamma and an I128 ion are produced with G4NeutronRadCapture.

    :----- List of 2ndaries - #SpawnInStep=  2(Rest= 0,Along= 0,Post= 2), #SpawnTotal=  2 ---------------
    :         0         0     -13.9      6.83              gamma
    :         0         0     -13.9  0.000194               I128
    :----------------------------------------------------------------- EndOf2ndaries Info ---------------

Even stranger, if the material is simply Li6, the secondary particles are a gamma and Li8. Just for fun, I tried it with U235 and the secondaries are a gamma and U238.

I would like to know what decides which secondaries are produced, why extra neutrons come into existence for certain materials, and how to produce the correct secondary particles.

I have tried adding many other physics processes as well to see what happens; the only thing I've noticed is that when I include electrons, sometimes an electron is produced in addition to the above secondaries.


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1 None: Re: G4NeutronRadCapture produces incorrect secondary particles   (michel maire - 19 Oct, 2016)
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