Message: Re: Neutron energy deposit on hafnium dioxide Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

None Re: Neutron energy deposit on hafnium dioxide 

Forum: Biasing and Scoring
Re: Question Neutron energy deposit on hafnium dioxide
Re: None 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

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 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)
... 2 Message(s)
 Add Message Add Message
to: "Re: Neutron energy deposit on hafnium dioxide"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews