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Question low energy neutron scattering problem 

Forum: Hadronic Processes
Date: 25 Oct, 2012
From: <Santos>

I am scattering 1.5MeV neutrons off a 1x1x1 mm cube of high pressure (100 atm) oxygen situated in vacuum. Actually, I repeated it with a 10atm 1x1x1 cm cube (with similar results), just want to make sure I only deal with single scattering events.

The resulting polar angle neutron distribution, which I am showing in the attached graph, looks very strange, with strange drop-offs at forward and backward angles.

I based my physics list on the Hadr01 example, with hadronic part having:

-- HadronPhysicsQGSP_BIC_HP (tried bertini as well, same thing)

-- G4EmExtraPhysics (from the corresponding include file)

-- G4HadronElasticPhysicsHP

-- G4QStoppingPhysics

-- G4IonPhysics

-- G4NeutronTrackingCut

I also tried scattering off carbon, and same strange features were present. Could anybody advise me on what can be wrong? Any possible problems with my physics list? Any known problems in GEANT at this energy?

By the way, now I am "playing" with good old geant 9.4p02, but I started out with 9.5, got strange carbon result, cross-checked with 9.4, and kept debugging in the older version.

Thank you in advance for any help!

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/10/25/09.44-11144-theta_g94_10Mbic.png

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1 Idea: Re: low energy neutron scattering problem   (Vladimir Ivanchenko - 26 Oct, 2012)
1 None: Re: low energy neutron scattering problem   (Santos - 26 Oct, 2012)
2 Question: Re: low energy neutron scattering problem   (Santos - 01 Nov, 2012)
1 None: Re: low energy neutron scattering problem   (Koi, Tatsumi - 02 Nov, 2012)
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