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Warning random velocity generator in G4Nucleus,cc 

Keywords: thermal neutron
Forum: Hadronic Processes
Date: 14 Jul, 2006
From: Richard Hodges <Richard Hodges>

In G4Nucleus the random velocity of a collision partner for a thermal neutron is chosen from a Gausian distribution. This procedure is unrealistic for both solids and gases. The distribution of vibrational states of target atoms in a solid is well explained by the Debye theory of specific heat. In a gas, the speeds and directions of random target atoms (or molecules) should be chosen from a biased Maxwellian flux distribution. In any case, it is essential to account for the variation of the cross section with relative velocity.

While GEANT4 is not heavily used for thermal neutrons, it doesn't make much sense to burden it with inaccurate code. If there is interest in correcting this problem, perhaps I can help.

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