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Question Simulating Recoil Ions 

Forum: Physics List
Date: 28 Aug, 2013
From: Martin Koslowsky <Martin Koslowsky>

Hello,

Mainly what I have been doing is smashing neutrons into nuclei. The processes I am most interested in modelling well are pretty much anything to do with neutrons, plus energy loss of protons and ions in materials. I think that most of everything else can emphasize computing speed over accuracy.

Firing primary neutrons, the energies I am dealing with are mostly in the 10 keV to 20 MeV regime. However, I am also interested in pushing higher, possibly up to 100 or 200 MeV. At less than 20 MeV I am currently using NeutronHP physics, with most of everything else being "LE" models (including the EM). This gives reasonable results, but doesn't quite match what I am expecting at >10 MeV.

I have a few suspicions regarding what would make things better, including:

1. Replacing the LE models for hIonisation and ionIonisation with something better.

2. Including electro-nuclear processes. These I shut off at some point because they were causing a segfault in my code during cleanup, however that is not a particularly big issue during the run itself.

With all that in mind, I have several questions:

1. What are the best models at low energy for hIonisation and ionIonisation, and how much is this likely to matter?

2. How much does the choice of EM model affect the gamma-nuclear and electro-nuclear processes (I think I remember reading something somewhere that implied that it did).

3. Most importantly, what is considered the most accurate approach above 20 MeV for neutrons? I am told that the experimental data above 20 MeV is sparse to nonexistent, so everything is likely a guess to some extent or another. But I have difficulty trusting the LENeutron models due to how badly they perform compared to HP models below 20 MeV.

That is a lot of questions, but I am relatively new to all of this so I would appreciate some advice.

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1 Idea: Re: Simulating Recoil Ions   (Vladimir Ivanchenko - 28 Aug, 2013)
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