Problem 1279

Summary:	different prompt gamma yield ratio
Product:	Geant4	Reporter:	Hyunha Shim <hhshim>
Component:	processes/hadronic/models/neutron_hp	Assignee:	tkoi
Status:	RESOLVED FIXED
Severity:	critical	CC:	dennis.herbert.wright
Priority:	P5
Version:	9.4
Hardware:	All
OS:	All
Attachments:	prompt gamma ratio(Nitrogen)

Description Hyunha Shim 2012-01-20 03:22:47 CET

I simulated prompt gamma when a neutron is captured in Nitrogen. I used the same code under condition of two different GEANT versions.(geant 4.9.1p02, geant4.9.4p02)
I compared normalized prompt gamma yields of two simulation results with experimental result(NIM 56 (1967)325).  (<-- I read gamma kinetic energy when processName is "nCapture".)
It shows quite different result at 10.83 MeV.

I used Neutron high-precision models.

Comment 1 Hyunha Shim 2012-01-20 03:25:03 CET

Created attachment 145 [details]
prompt gamma ratio(Nitrogen)

Comment 2 tkoi 2013-05-29 02:31:35 CEST

This problem is caused by the final state adjustments for better conservation. 
I added capability to disable the adjustment for reproducing old result. 
You will get the old result by setting an environment variable of “G4NEUTRONHP_DO_NOT_ADJUST_FINAL_STATE”.
However the environment variable significant may give impacts to result, for example you may lost residual nucleus in “Inelastic” reactions.