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Forum: Biasing and Scoring
Re: Question Neutron energy deposit on hafnium dioxide
Re: None Re: Neutron energy deposit on hafnium dioxide (michel maire)
Re: None Re: Neutron energy deposit on hafnium dioxide
Date: 09 Oct, 2017
From: michel maire <michel maire>

On Sat, 07 Oct 2017 12:09:54 GMT, jeonyboy wrote:

> 
> 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?
> 
 1- It is not directly related. Kinetic energy of secondaries which are not generated (e.g. below threshold) are counted in the dE/dx of the primary particle. I would suggest to keep default cut ( ~ 1 mm). Playing with cuts will be a later refinement.

 2- Make sure that you have neutronHP in your physics list (compare with hafnium.out.txt).

 3- Around 1 eV, neutron capture dominates, cross section increases, mean free path is "only" ~0.5 mm
      Then ~10^7 events would allow to see few interactions.

 4- At most energies, elastic collisions may be important. The recoil nucleus contributes to energy deposition. But, for various reasons, this recoil nucleus is not generated by default.
 To create it, make sure that your physics list includes the statement  setCutValue(0*mm, "proton") 
 Instead, you can use the command /run/setCutForAGivenParticle  proton  0.  mm
 (if you do not understand well what I am speaking about, play with Hadr03 ...)

 5- I tried your exercice with Hadr07. I attach macro, output and plot. As you will see, there are 94 interactions  for 10^7 events.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/10/09/09.47-57787-hafnium.out.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/10/09/09.47-61635-hadr07.mac.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/10/09/09.47-76278-hadr07.out.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/10/09/09.47-48419-edep.gif

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