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Question Re: Follow up questions on Liquid Hydrogen 

Forum: Hadronic Processes
Re: Question Follow up questions on Liquid Hydrogen (Evan Askanazi)
Re: Idea Re: Follow up questions on Liquid Hydrogen (Vladimir Ivanchenko)
Date: 10 Jun, 2011
From: Evan Askanazi <Evan Askanazi>

Ok thanks for explaining. So then how can you specify that the Liquid Hydrogen corresponds to actual para or ortho hydrogen ? How can you make Liquid Hydrogen and ensure that it is actually ParaHydrogen, for example ? And that if neutrons or other particles are launched into it that they will scatter or capture in accordance at the rate they should for parahydrogen ?

Also, i am still wondering how the G4NeutronHPThermalScattering physics process, defined here :

G4NeutronHPThermalScattering* theNeutronThermalElasticModel = new G4NeutronHPThermalScattering();

G4NeutronHPThermalScatteringData* theHPThermalScatteringData = new G4NeutronHPThermalScatteringData();

theNeutronThermalElasticModel->SetMaxEnergy ( 4.0*eV ); theNeutronElasticProcess->RegisterMe(theNeutronThermalElasticModel); theNeutronElasticProcess->AddDataSet(theHPThermalScatteringData);

calculates scattering as compared to the G4HadronElasticProcess shown here:

G4HadronElasticProcess* theNeutronElasticProcess = new G4HadronElasticProcess();
   G4NeutronHPElastic* theHPElasticModel = new G4NeutronHPElastic();
   G4NeutronHPElasticData* theHPElasticData = new G4NeutronHPElasticData();

And in particular what data both processes use to calcualte scattering rates. I was thinking that one of these processes could somehow be modified to accurately simulate neutron scattering in liquid Hydrogen, but I was still looking for imformation on what date they use. And I was looking to see if perhaps any of the Geant4 experts had any info in it.

Thanks again for your help, E Askanazi

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