Effect of varying HP process parameters on 58Ni thermal neutron capture gamma ray results from Hadr03 Summary: -------- 1. There is good agreement between Geant4 and NNDC thermal neutron capture gamma ray energies ONLY when use_photo_evaporation is true. 2. There is very poor agreement between Geant4 and NNDC gamma ray relative intensities for all combination of HP process parameters. 3. Energy conservation of individual neutron capture gamma ray processes happens 100% of the time ONLY when all HP process parameters are true. 4. 'Fictional' gamma rays are produced for all combinations of HP process parameters, regardless of whether energy conservation occurs or not. 5. I do not know what the default values of the HP process parameters are, but they are not all false as stated in the documentation (p.60 11.0 Guide for Physics Lists) Details: -------- HP process parameter my default (see p.60 11.0 of Guide for Physics Lists) symbol ------------------------- ------ ----------------------------------------------- use_photo_evaporation e false (0) (Note: In the below cases, true (1) seems to be the default for e!) skip_missing_isotopes s false (0) do_not_adjust_final_state d false (0) neglect_Doppler_broadening n false (0) (Example usage: /process/had/particle_hp/use_photo_evaporation true) esdn 1111 spectra: very good match to NNDC gamma ray energies relative intensities do not agree with NNDC many additional gamma ray energies that do not agree with NNDC Energy conserved 100% of events Total gamma rays/10 events Fictional gamma ray energies Close gamma ray energies Match to NNDC gamma ray energies /10 events (>+-10keV from NNDC) (<+-10keV from NNDC) (<=+-1.5keV from NNDC) 33 5 9 19 1101 very good match to NNDC gamma ray energies relative intensities do not agree with NNDC many additional gamma ray energies that do not agree with NNDC Energy conserved 90% of events Total gamma rays/10 events Fictional gamma ray energies Close gamma ray energies Match to NNDC gamma ray energies /10 events (>+-10keV from NNDC) (<+-10keV from NNDC) (<=+-1.5keV from NNDC) 34 3 11 20 0111 bad spectra: only 9 significant lines, each is very wide triangular shape (base ~100keV) energies are a poor match to NNDC energies, relative intensities do not agree with NNDC Energy conserved 80% of events Total gamma rays/10 events Fictional gamma ray energies Close gamma ray energies Match to NNDC gamma ray energies /10 events (>+-10keV from NNDC) (<+-10keV from NNDC) (<=+-1.5keV from NNDC) 18 6 9 3 0101 bad spectra very wide (~100keV) bad spectra triangular lines very poor match but has intense narrow line at correct energy 8999 keV Energy conserved 60% of events Total gamma rays/10 events Fictional gamma ray energies Close gamma ray energies Match to NNDC gamma ray energies /10 events (>+-10keV from NNDC) (<+-10keV from NNDC) (<=+-1.5keV from NNDC) 18 3 6 9 0000 (supposedly default) bad spectra very wide (~100keV) bad spectra triangular lines very poor match but has intense narrow line at correct energy 8999 keV spectrum is same as 0101 Energy conserved 50% of events Total gamma rays/10 events Fictional gamma ray energies Close gamma ray energies Match to NNDC gamma ray energies /10 events (>+-10keV from NNDC) (<+-10keV from NNDC) (<=+-1.5keV from NNDC) 19 3 7 9 default (supposedly 0000) very good match to NNDC gamma ray energies relative intensities do not agree with NNDC many additional gamma ray energies that do not agree with NNDC Energy conserved 100% of events Total gamma rays/10 events Fictional gamma ray energies Close gamma ray energies Match to NNDC gamma ray energies /10 events (>+-10keV from NNDC) (<+-10keV from NNDC) (<=+-1.5keV from NNDC) 34 5 10 19