Problem 1332

Summary: hidden cut in hadron elastic process
Product: Geant4 Reporter: michel.maire
Component: processes/hadronic/processesAssignee: dennis.herbert.wright
Status: RESOLVED WONTFIX    
Severity: trivial    
Priority: P5    
Version: 9.5   
Hardware: All   
OS: All   

Description michel.maire 2012-07-01 13:20:50 CEST 
There is an hard coded cut in hadrElastic process : recoil nuclei is not generated below 1 keV
Consequences :
1- momentum conservation is broken
2- users cannot identify a specific nuclear channel
Comment 1 dennis.herbert.wright 2012-07-04 02:37:37 CEST 
Except for neutrons, we have no hadronic models that are valid below 1 keV and so the initial projectile and target are simply returned with no interaction in that case.  As Vladimir mentions in the code for G4WHadronElasticProcess::PostStepDoIt, very low energies cause numerical problems.  

So, until we have very low energy models for particles other than neutrons, this is the best we can do.