|Message: Re: Neutron energy deposit on hafnium dioxide||Not Logged In (login)|
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On Tue, 03 Oct 2017 03:22:57 GMT, jeonyboy wrote:
> Hello all, > > 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? >
Let me try to quantify what Michael said. In example Hadr03, I have defined hafnium dioxide material, and ran the attached macro. As you can see on output, the mean free path ( or interaction length) of neutron (10 MeV) is 4.68 cm. Therefore the probability to have one interaction within 10 nm is 10 nm/4.68 cm = ~2 10^-7
In other words, you must have ~5 10^6 neutrons beam to get one interaction, or 5 10^9 neutrons to get 1000 interactions. Have you such a statistic ?
Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/10/04/03.40-36421-hafnium.mac.txt http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/10/04/03.40-10094-hafnium.out.txt
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