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Forum: Hadronic Processes
Re: Question Thermal neutron scattering issue in Hadr04
Date: 05 Feb, 2014
From: michel maire <michel maire>

On Tue, 04 Feb 2014 11:33:43 GMT, bbv_nsk wrote:
> Dear Colleagues, we have some problems with using of the thermal neutron
> scattering models.
> 
> We are considering the project Hadr04 and we introduced following
> changes in it:
> 
> 1. We removed Oxygen from the water. Now it consists of only Hydrogen
> ("TS_H_of_Water").
> 
> 2. We changed the Hadr04.cc. Now it runs vis1.mac without any dialogs.
> 
> 3. We changed the PrimaryGeneratorAction.cc in order to set the initial
> energy of emitted neutron to 4 eV.
> 
> Now we expect to see how the S(a,b) model works. But unfortunately we
> don't see any single scattering process. The neutron either is
> immediately captured by the atoms or it leaves the mother volume. The
> output file shows the results of such experiment.
> 
> It seems we wrongly activated the thermal scattering process. But we
> have no idea how to make it right. Can anybody help us with this issue?
> 

 There is a problem with G4NDL4.4 Not with the data set, but in the code to read it.
 You have  2 alternatives:
 - wait for Geant4.10 correction patch 1, to be release very soon
 - still use G4NDL4.2, but do not forget to download thermal scattering part:
   G4NDL4.2.TS 

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