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Forum: Biasing and Scoring
Re: Question Neutron energy deposit on hafnium dioxide
Date: 04 Oct, 2017
From: michel maire <michel maire>

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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1 None: Re: Neutron energy deposit on hafnium dioxide   (jeonyboy@gmail.com - 07 Oct, 2017)
(_ None: Re: Neutron energy deposit on hafnium dioxide   (michel maire - 09 Oct, 2017)
1 None: Re: Neutron energy deposit on hafnium dioxide   (jeonyboy@gmail.com - 09 Oct, 2017)
1 None: Re: Neutron energy deposit on hafnium dioxide   (jeonyboy@gmail.com - 10 Oct, 2017)
2 None: Re: Neutron energy deposit on hafnium dioxide   (jeonyboy@gmail.com - 10 Oct, 2017)
1 None: Re: Neutron energy deposit on hafnium dioxide   (michel maire - 10 Oct, 2017)
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