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Question Creation of Neutrons for a 1.94MeV Proton beam 

Forum: Physics List
Date: 21 Jul, 2008
From: Alan Shippen <Alan Shippen>

Hello,

I am running a simulation of a Lithium Fluorine target being hit by a 1.94MeV proton beam. In the simulation the created neutrons are recorded then killed through the user stepping functions.

From this interaction i am expecting to see at most a 144keV neutron every 3 million protons or so.

However if I run the QGSP_BERT(_HP) physics list I seem to get spurious results whereby a continuous spectrum of neutron energies is created upto around 1.2MeV, which, given energy conservation etc..., is impossible is it not?!?!

I then tried to use the QGSP_BIC(_HP) physics list which says it has implemented within it a better model for the production of secondaries. When this is run no secondaries are created at all. This physics list is run 'as standard' with no modifications is there something I am doing wrong with this physics list?

Are these models usable at energies close to the reaction threshold? if not does Geant4 provide a means with which to draw in ENDF cross sections?

Regards

Alan

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1 None: Re: Creation of Neutrons for a 1.94MeV Proton beam   (Alan Shippen - 28 Jul, 2008)
(_ None: Re: Creation of Neutrons for a 1.94MeV Proton beam   (Koi, Tatsumi - 13 Aug, 2008)
(_ None: Re: Creation of Neutrons for a 1.94MeV Proton beam   (Alan Shippen - 13 Aug, 2008)
(_ Feedback: Re: Creation of Neutrons for a 1.94MeV Proton beam   (Gunter Folger - 14 Aug, 2008)
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