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None (n, n+alpha) reaction at 16Oxygen, NeutronHP, G4.10.00 

Forum: Hadronic Processes
Date: 09 Apr, 2014
From: <bbv_nsk>

Colleagues, I am considering a model with pure Oxygen and 14 MeV neutron source. I use the Geant4.10.00. Using tracking verbosity I look at the secondary particles emitted after inelastic reactions. Specifically I am interested in the reaction (n, n+alpha).

I see that after each such reaction one gamma particle with the energy 4.44 MeV is always emitted. And I have a concern here.

The emission of gamma particles after such reactions is described in the ENDF VII data library with two sets of cross sections. The first set is the neutron cross section data and they are given by MF = 3 and MT = 22. The second set is the photon production cross sections data that are given by MF = 13 and MT = 22. These two sets of data should be used for computing the multiplicity of emitted gamma particles by taking a ratio of the production cross sections to the neutron cross sections.

I see that the multiplicity of emitting the gamma quantum with the energy 4.44 MeV is less than unity but the Geant4 acts like it is equal to unity.

I looked into the source code and I didn't see that the multiplicity are calculated. I think there is a problem in this part of code.

Could you please comment this issue?

Thanks,

Bair

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1 None: Re: (n, n+alpha) reaction at 16Oxygen, NeutronHP, G4.10.00   (michel maire - 12 Apr, 2014)
(_ None: Re: (n, n+alpha) reaction at 16Oxygen, NeutronHP, G4.10.00   (bbv_nsk - 14 Apr, 2014)
(_ None: Re: (n, n+alpha) reaction at 16Oxygen, NeutronHP, G4.10.00   (michel maire - 14 Apr, 2014)
(_ None: Re: (n, n+alpha) reaction at 16Oxygen, NeutronHP, G4.10.00   (bbv_nsk - 14 Apr, 2014)
(_ None: Re: (n, n+alpha) reaction at 16Oxygen, NeutronHP, G4.10.00   (michel maire - 14 Apr, 2014)
1 None: Re: (n, n+alpha) reaction at 16Oxygen, NeutronHP, G4.10.00   (bbv_nsk - 14 Apr, 2014)
2 None: Re: (n, n+alpha) reaction at 16Oxygen, NeutronHP, G4.10.00   (michel maire - 19 Apr, 2014)
1 None: Re: (n, n+alpha) reaction at 16Oxygen, NeutronHP, G4.10.00   (bbv_nsk - 21 Apr, 2014)
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