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## Re: Neutron energy deposit on hafnium dioxide

Forum: Biasing and Scoring
Re: Neutron energy deposit on hafnium dioxide
Re: Re: Neutron energy deposit on hafnium dioxide (michel maire)
Date: 07 Oct, 2017
From: <jeonyboy@gmail.com>

 On Wed, 04 Oct 2017 10:44:19 GMT, michel maire wrote: ```> 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 > ``` Hi, following your helpful and detailed explanation, I have upped the neutron particle shot from 2x10^6 to 2x10^8 but still energy deposits are being observed. Maybe because the B4d example I am basing has default cut range much greater than nm? So I am trying run/setCut 1 nm in my executable file before running the macro file. It takes really long time for it to process, hopefully this will work. I really appreciate your help. ``` http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/10/07/05.00-73673-10MeVNeutron2x10_8.txt ```

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1 Re: Neutron energy deposit on hafnium dioxide   (michel maire - 09 Oct, 2017)
1 Re: Neutron energy deposit on hafnium dioxide   (jeonyboy@gmail.com - 09 Oct, 2017)
1 Re: Neutron energy deposit on hafnium dioxide   (jeonyboy@gmail.com - 10 Oct, 2017)
2 Re: Neutron energy deposit on hafnium dioxide   (jeonyboy@gmail.com - 10 Oct, 2017)
1 Re: Neutron energy deposit on hafnium dioxide   (michel maire - 10 Oct, 2017)
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