Problem 1279 - different prompt gamma yield ratio
Summary: different prompt gamma yield ratio
Status: RESOLVED FIXED
Alias: None
Product: Geant4
Classification: Unclassified
Component: processes/hadronic/models/neutron_hp (show other problems)
Version: 9.4
Hardware: All All
: P5 critical
Assignee: tkoi
URL:
Depends on:
Blocks:
 
Reported: 2012-01-20 03:22 CET by Hyunha Shim
Modified: 2013-05-29 02:32 CEST (History)
1 user (show)

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Attachments
prompt gamma ratio(Nitrogen) (8.29 KB, image/gif)
2012-01-20 03:25 CET, Hyunha Shim 		Details
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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.