Message: LElastic vs hElastic Not Logged In (login)

Question LElastic vs hElastic 

Forum: Hadronic Processes
Date: Jun 25, 00:28
From: Maria Gatu Johnson <Maria Gatu Johnson>

I am working on updating an existing GEANT 4.5 application (not written by me) to get it to work with GEANT 4.9. The application is low energy (1-18 MeV) neutron interactions in a time-of-flight system. I have previously replaced the custom made old Physics list with QGSP_BIC_HP. Now the code is running but for the same amount of simulated particles I get a lot fewer interactions (about half) than in GEANT 4.5. Another change I made was in the Stepping Action, I changed 'processName == "LElastic"' (which was not recognized by GEANT 4.9) to 'processName == "hElastic"'. Does this exclude events? Were more processes included in the old "LElastic" than in the new "hElastic"?

Maria

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None Re: LElastic vs hElastic  by Dennis H. Wright <Dennis H. Wright>,   Jun 26, 11:04
Re: Question LElastic vs hElastic (Maria Gatu Johnson)
Hi Maria,

   There have been many changes between Geant4 versions 5 and 9, including improvements in the high precision neutron code.  These may include a decrease
in cross section for given isotopes, but in any case, the later versions of
HP neutron should be considered more correct.
   You will not lose any particles in SteppingAction unless you specifically 
remove particles in that code, which is not a good idea in general.
   hElastic designates the use of a more general elastic scattering code that 
tries to take the best elastic scattering model in each energy range for each particle.  Depending on the physics list used it could be G4UHadronElasticProcess
or G4HadronElasticProcess.  LElastic refers to the older GHEISHA-style elastic
scattering model.

Dennis

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