|Message: Re: Neutron Range||Not Logged In (login)|
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On Fri, 15 Dec 2017 16:32:33 GMT, M Sek wrote:
> On Tue, 12 Dec 2017 12:19:37 GMT, michel maire wrote:
> > Defining "range" or "penetration" of neutrons is not so simple as for charged particles : there > > is no Bethe Bloch formula ![...]
> you indicate range or penetration definitions are not so simple for > neutral particles, I also get that. However, there must be a method for > obtaining these values. I am sure Geant4 is capable of doing that. I > just do not know how to use it. I will be so grateful if you could point > a direction for me.
The problem isn't "neutral particles" in general -- photons have a well-defined interaction length. Neutrons undergo inelastic hadronic interactions: the incident neutron is absorbed by a nucleus, and a new neutron (or even more than one!) may be emitted. Does "range" correspond to that first interaction? If not, do you carry on with the secondary neutron(s), to determine the material depth at which all secondary interactions stop? What about other secondaries, like protons?
Those are the sorts of questions you will need to answer in order to come up with a definition of "range". Once you have such a definition, implementing it in a stepping action should be fairly straightforward.
-- Michael Kelsey