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Forum: Hadronic Processes
Re: Question Missing implementation of deuteron elastic scattering (N.P.M. Brantjes)
Re: None Re: Missing implementation of deuteron elastic scattering (Vladimir IVANTCHENKO )
Date: 07 Dec, 2006
From: N.P.M. Brantjes <N.P.M. Brantjes>

User Vladimir IVANTCHENKO wrote:

>> > HI, I want to simulate deuteron scattering on a carbon target. My
>> > deuterons have a kinetic energy of around 500 MeV In Line 1258 of
>> > G4HadronCrossSections.cc, the elastic cross section for deuterons and
>> > Helium ions is hardcoded to 0. This process is therefore not implemented
>> > for deuterons.
>> > 
>> > I have a few questions about it. -Is this intentionally, or will this
>> > situation be fixed in the near future?
>> >
>> 
>> Hello,
>> 
>> In the new process G4UHadronElasticProcess it is fixed. This process is 
>> available since 8.1.
>>  

Hi,

thank you for your fast reply. I am currently using the latest version of Geant4 and I have indeed looked into the G4UHadronElasticProcess. However, this process obtains its cross sections from G4HadronElasticDataSet and thus from G4HadronCrossSections. Thus it appears to refer to exactly the same hardcoded zero.

>> > -When I put an arbitrary number here, the process takes place and there
>> > is some particle change as a result. Does this particle change reflect
>> > reality?
>> > 
>> > -What kind of model do you advise for me to implement to fix this
>> > problem?
>> > 
>> > -As the deuteron elastic process is obviously not working, can I still
>> > trust the implementation of the Deuteron inelastic process to reflect
>> > reality?
>> 
>> Elastic scattering of deuteron due to strong interaction is not the main
>> process, because the cross section is relatively small and the effect is
>> only scattering on small angle.

I am well aware that this is not the most important effect, but it happens to be the main effect for my study as it is spin dependend.

>> 
>> > 
>> > -In the deuteron inelastic process, also deuteron breakup seems to
>> > covered next to elastic scattering. Is there a particular reason for
>> > this and is there a way for these two interactions to show up under a
>> > different name?
>> > 
>> > Thanks ahead, Klaas Brantjes University Groningen
>> > 
>> 
>> For deuterons I would suggest to use binary cascade as inelastic 
>> interaction. Some example you can find out
>> 
>> examples/extended/eletromagnetic/TestEm7
>> example/extended/hadronic/Hadr01
>> 
>> VI
>>

I will look into the binary cascade. thank you for the info :)

Klaas Brantjes

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1 None: elastic issues   (Ryan Romero - 26 Jan, 2007)
(_ None: Re: elastic issues   (Vladimir IVANTCHENKO - 29 Jan, 2007)
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