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Forum: Hadronic Processes
Re: Question Best model for fission n,g production (Michael)
Date: 05 Aug, 2011
From: Michael <Michael>

Hi guys...

Could really do with more help on this question. At the moment I'm trying to benchmark Geant4 / MCNP-X for a simple fission problem:

1.2 MeV neutron source -> block of u235.

I'm tallying neutron / gamma number as a function of energy (time integrated) and as a function of energy (time integrated); tally surface is just a thin sphere surface around the problem.

The G4NeutronHPFission produces delayed neutrons and gammas but at a much lower intensity than MCNP-X, G4ParaFissionModel and G4LFission don't produce any delayed gammas at all?

The gamma spectrum from U235 using 4NuetronHPFission doesn't compare well either; the MCNP-X matches literature better but has discontinuities in it (I'm told it's related to their multi-compound model); nevertheless niether looks like it nails the problem.

I'd really appreciate some advice on this...I'm specifically interested in delayed gammas and neutrons.

Cheers,

Mike.

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