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Forum: Hadronic Processes
Re: None Creation of Neutrons from a 1.94MeV Proton beam (Alan Shippen)
Date: 14 Aug, 2008
From: Gunter Folger <Gunter Folger>

Hello Alan,

Let me explain what *_BIC_HP does. The model responsible for protons of this energy will be Binary Cascade, but this will directly pass on to the Precompound model, as the energy is too low for the cascade model. I don't know why Precompound does never seem produce a secondary neutron; Precompound as a general model does NOT include the modeling of direct reactions, maybe this explains what you see; I will check with the person responsible for Precompound.

The Bertini cascade is known to have small problems with teh Coulomb barrier for protons, this may explain teh spurous result you observe using *_BERT(_HP) physics lists; the situation has much improved in the beta release for 9.2, however the Bertini cascade model is expected to give a good description of interactions for your range of energies.

We do not have a model in Geant4 which will simulate interactions of low energy particles using a database of possible reaction channels, except for low energy neutron interactions.

Cheers, Gunter

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