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None neutron energy gain with Hadronelastic process 

Keywords: neutron, energy, physicslist
Forum: Physics List
Date: 10 Jan, 2008
From: glinec <glinec>

Dear all,

Thank you for this very useful application. I've been using it for different purpose during the past years.
Now I try to use neutrons, but I'm facing a problem when tracking particles.

In this simulation, an initial 2 MeV neutron looses progressively energy in a water volume (target).
For energies < 1 eV, the neutron energy often increases.

*********************************************************************************************************
* G4Track Information:   Particle = neutron,   Track ID = 1,   Parent ID = 0
*********************************************************************************************************

Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
   15     13.6     14.1    1e+03  1.49e-08        0        0  1.05e+03      Target initStep
   16     25.4     6.76 1.01e+03  2.12e-08        0     14.9  1.07e+03      Target HadronElastic
    :----- List of 2ndaries - #SpawnInStep=  1(Rest= 0,Along= 0,Post= 1), #SpawnTotal=  1 ---------------
    :      25.4      6.76  1.01e+03  5.56e-08             proton
    :----------------------------------------------------------------- EndOf2ndaries Info ---------------
Track (trackID 1, parentID 0) is processed with stopping code 4
### pop requested out of 2 stacked tracks.

And the energy of each neutron goes up and down until it reaches the end of the world.

What do I do wrong ? Bad physics list ? Incorrect distribution functions ?
I'm basically using the physics list from advanced/underground_physics without the scintillation part. (HPelastic, HPinelastic and HPcapture).
Therefore, I've added UserCuts in energy to stop the energy oscillations. This forces a decay and gamma+anti-neutrino.

Is there a correct way to simulate this neutron propagation ?

Best regards
Yannick
References : geant4.9.1 G4NDL3.12

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2 None: Re: neutron energy gain with Hadronelastic process   (Koi, Tatsumi - 10 Jan, 2008)
(_ None: Re: neutron energy gain with Hadronelastic process   (glinec - 10 Jan, 2008)
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