|Message: Re: Issues with gamma spectra for neutron capture on cadmium||Not Logged In (login)|
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Thanks so much for the reply. According to the NNDC CapGam data base, 113Cd(n,gamma)114Cd releases discrete gamma rays at 558.46 and 651.26 keV primarily (http://www.nndc.bnl.gov/capgam/byn/page126.html). So I am very confused as to why the gamma emission energy spectrum from JENDL would be continuous for the capture reaction, unless I am missing something.
A few questions:
1) Which portion of G4NeutronHP handles the final state selection of the excited nucleus for capture? If G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION=1 is set, Geant4 seems to correctly reproduce the experimental 113Cd(n,gamma) energy and emission spectrum, and the 114Cd energy levels in geant4 data library PhotonEvaporation2.1 are correct with respect to the energy of neutron-capture gamma rays. So everything about the "default" G4NeutronHP seems correct with the exception of the incorrect gamma energy spectrum.
2) Are you implying that G4NeutronHPCapture attempts to conserve energy of the reaction by producing non-physical gamma rays? Is there a reason why the photon evaporation data is not used as the default to produce capture gamma rays (since it seems to give a result which matches the experimental data)?
3) Are there any validation results of G4NeutronHPInelastic or G4NeutronHPCapture gamma production that you could point me to?
Thanks again, looking forward to your reply