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Idea Re: Add Neutron Process 

Forum: Physics List
Re: Question Add Neutron Process (Qing Wang)
Date: 22 Apr, 2010
From: Zach Hartwig <Zach Hartwig>

Hi Qing,

If you want to add the n+6Li reaction to your simulation, you will have several options:

1) attach a G4NeutronInelasticProcess object ("the process") to your neutron along with objects of type G4NeutronHPInelastic (the "model") and G4NeutronHPInelasticData ("the cross section data"), if you are building your own physics list from scratch. Try the following for guidance:

  http://geant4.web.cern.ch/geant4/support/proc_mod_catalog/processes/hadronic/G4NeutronInelasticProcess.html

or

2) Use the QGSP_BERT_HP pre-built physics list.

or

3) Use the "Physics Builders" to add pre-written physics to your simulation, in which you include QGSP_BERT_HP. A good example of this type of physics list is in the Geant4 distribution examples: $G4INSTALL/examples/extended/hadronic/Hadr01/

Be aware that while the n+6Li cross section is correct in Geant4, the nuclear kinematics of the triton and the alpha are *WRONG* as of geant4.9.3. For more on this issue, as well a patch to fix it, please see Hypernews post #1045 in the Hadronicforum:

  http://hypernews.slac.stanford.edu/HyperNews/geant4/get/hadronprocess/1045.html

Best.

~Zach

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