| Summary: | Thermal neutron capture does not generate nuclear lines | ||
|---|---|---|---|
| Product: | Geant4 | Reporter: | Andreas <zog> |
| Component: | processes/hadronic/models/neutron_hp | Assignee: | tkoi |
| Status: | RESOLVED FIXED | ||
| Severity: | major | ||
| Priority: | P5 | ||
| Version: | 9.2 | ||
| Hardware: | All | ||
| OS: | All | ||
| Attachments: | Expected result | ||
OK. My fault. I was accidentally using (and debugging) an old Geant4 version. Problem is fixed in version 9.2 using the G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION flag. I also checked independently and “G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION” flag works fine as designed. I believe this flag also works in previous version of Gean4. Tatsumi |
Created attachment 44 [details] Expected result Hello, I am shooting thermal neutrons (25 eV) on Cd. This results in the reaction 113Cd (n, gamma) 114Cd. Measurements show that the reaction should lead to a strong 558 keV line, simulations with Geant4.9.2 using the qgsb-bic-hp physics list, don't show any nuclear lines. I tried both cases, once using G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION and once not. I was able to trace the problem down to the function G4NeutronHPCapture::ApplyYourself: The photons in the if-loop starting with "if (HasFSData() ...", both cases, never include the correct nuclear gamma-ray energies and gamma-ray cascades as expected from the photon evaporation data. Thanks for fixing this problem, Andreas