Re: [fluka-discuss]: the comparision of Multiple Scattering cross section and Single Scattering cross section

From: Alberto Fasso <fasso_at_mail.cern.ch>
Date: Tue, 18 Feb 2014 16:30:29 +0100

Dear Chen Yuan,

you have already asked many times questions about multiple scattering and
single scattering in FLUKA. I hope this is the last time: the purpose of
this discussion list is to help users to set up and run FLUKA, not to look
for information which can be easily found with Google or any other search
engine.

First, it is not correct what you say, that "the results... differ from
multiple scattering to total single scattering". If there is a
difference, it is minimal: it is not true that "the results are quite
different", except concerning the computer time used. See for instance
slide 20 in: http://www.fluka.org/content/presentations/2000_mc_fasso.pdf

About your other questions, please read:
http://www.fluka.org/content/publications/1995_sare.pdf

Alberto

On Tue, 18 Feb 2014, yyc2011_at_mail.ustc.edu.cn wrote:

> Dear Fluka experts,
>
> For the same target,the results(the electrons flux density)differ from
> multiple scattering to total single scattering.Here,total single
> scattering refers to single scattering everywhere in the target.But,I
> don't know why the results are quite different.
>
> So,here are my questions.My first question :In the Fluka code,is
> multiple scattering cross section different from total single scattering
> cross section? If they are not the same,what is the difference? I know
> multiple scattering theory use the screened Rutherford cross section.But
> how about single scattering? What kind of cross section it uses? My
> second question:In the Fluka code,does multiple scattering take into
> account spin-relativistic effects and the nuclear finite size? In the
> Fluka code,does single scattering take into account spin-relativistic
> effects and the nuclear finite size?
>
> I am looking forward to receive from you.
>
> Best Regards
> Chen Yuan
>
>
>
>
Received on Tue Feb 18 2014 - 17:36:09 CET

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