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Forum: Hadronic Processes
Re: Question Neutron Range (M Sek)
Re: None Re: Neutron Range (michel maire)
Re: None Re: Neutron Range (M Sek)
Re: None Re: Neutron Range (michel maire)
Date: 15 Dec, 2017
From: M Sek <M Sek>

On Tue, 12 Dec 2017 12:19:37 GMT, michel maire wrote:
> 
>  As you know, for neutrons, elastic collisions are important (even dominant at thermal energies), making trajectories of such neutrons erratic.
> 
>  For example, from Hadr03 I read :  neutrons 10 MeV on Gd, mean free path for elastic collisions ~ 13 cm and inelastic interactions ~ 13 cm (a coincidence !). 
>  A neutron can make several elastic collisions before to end with an inelastic interaction.
>  To see the effect, you may run Hadr04 or Hadr07 interactively with visualisation, with attached macros.
>  Defining "range" or "penetration"  of neutrons is not so simple as for charged particles : there is no Bethe Bloch formula !
> 
>   Ps : Hadr04 is exclusively devoted to neutrons. It does not make sense to shoot a proton.
> 
>    Attachment:
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/12/12/04.14-45606-hadr04.mac.txt
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/12/12/04.14-91482-hadr07.mac.txt
> 

Dear Dr. Marie,

Thank you so much for your consideration. I am grateful for your reply and teaching efforts. Using a proton in a Hadr example was just because of curiosity and I was trying to make it clear for me.

On the other hand, I tried to run the macros you provide. As you already mentioned, visual observation makes it more clear for understanding yet I still aspire to obtain the neutron and gamma ranges in materials. It is clear that Bethe-Bloch formula is valid for charged particles. Also, you indicate range or penetration definitions are not so simple for neutral particles, I also get that. However, there must be a method for obtaining these values. I am sure Geant4 is capable of doing that. I just do not know how to use it. I will be so grateful if you could point a direction for me.

Respects, M Sek

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1 Feedback: Re: Neutron Range   (Michael H. Kelsey - 15 Dec, 2017)
2 None: Re: Neutron Range   (michel maire - 16 Dec, 2017)
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