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Question What is the neutron energy deposition mechanism? 

Forum: Hadronic Processes
Date: 14 Aug, 2014
From: matthew <matthew>

I'm trying to simulate the energy deposited in air from 14.1 MeV neutrons. The code is working well, but my understanding of GEANT physics mechanisms could use some work---specifically the energy deposition mechanisms.

For example, I'm tracking multiple particles and their secondaries. At the end of the run, I tabulate the number of particles created and the energy each particle species deposited.

I understandably get a large energy deposition for charged particles (electrons, ions, protons, alphas, etc), ~ 100's of MeV, which I attribute to energy deposition via ionization and/or bremsstrahlung. I get a small amount of energy deposit from gamma rays (less than 1 MeV) which i understand because they are transferring energy to charged particles (e.g. electrons) that then deposit energy.

However, I get ten's of MeV deposited from neutrons. This value I'm not sure I understand. Knock-on collisions would transfer energy and ultimately be deposited by ions, correct? What process is allowing energy deposition by neutrons?

thanks for any guidance.

matt

p.s. I am using the QGSP_BERT_HP modular physics list.

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1 Idea: Re: What is the neutron energy deposition mechanism?   (Vladimir Ivanchenko - 16 Aug, 2014)
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