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Idea Re: Neutron energy deposit on hafnium dioxide 

Forum: Biasing and Scoring
Re: Question Neutron energy deposit on hafnium dioxide
Date: 02 Oct, 2017
From: Michael H. Kelsey <Michael H. Kelsey>

On Tue, 03 Oct 2017 03:22:57 GMT, jeonyboy wrote:
> I am trying to figure out neutron energy deposit for energies from low
> to high (1~200 MeV) in a hafnium dioxide box the size of 5x10x10 nm^3. I
> am using a B4d based program, however I get no energy deposits no matter
> what I try. I tried setting the set/cut to 1um but no changes still. Am
> I missing something?

Neutrons themselves do not deposit energy (they're neutral particles, and energy deposits occur due to electromagnetic interactions). If you are doing something like a SteppingAction and only looking for hits from neutrons, you'll get zero. You need to accept energy deposit from _all_ particles (e.g., a neutron is captured on a nucleus, which subsequently emits gammas or electrons or whatever).

Is your box really just nanometers on a side? If the cross-sections for your desired interactions are large enough, then you might see hits, but with only a few hundred atoms in your box, it's likely that most of your simulation events are just "pass through", with no interactions. You may need to make your target larger to see anything.

  -- Michael Kelsey

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