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None possible bug fix in NeutronHPFission model 

Forum: Hadronic Processes
Date: 19 Nov, 2007
From: Victor_Makarov <Victor_Makarov>

As I've already posted in Bugzilla, NeutronHPFission model produces too many fission neutrons with energies around 20 MeV. After some investigations I found out that error hides in G4NeutronHPVector which returns energy value to G4NeutronHPArbitaryTab. I'm not very good in Geant 4 programming, so I could not locate the error itself in G4NeutronHPVector. But I tried this: I changed next lines of

theBuffer.Merge(theManager.GetScheme(low), anEnergy, 
               theDistFunc+low, theDistFunc+high);
return theBuffer.Sample();

to these:

theBuffer.Merge(theManager.GetScheme(low), anEnergy, 
               theDistFunc+low, theDistFunc+high);
G4double ee;
ee = theBuffer.Sample();
while (ee>19.0*MeV)  ee = theBuffer.Sample();
return ee;

The result was quite good - energy distribution became identical to LLNL fission model's and to Geant 3's. Of course, I'll be very thankful if one can correct itself and share the solution. Comments are welcome!

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1 None: Re: possible bug fix in NeutronHPFission model   (Koi, Tatsumi - 06 Dec, 2007)
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