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Forum: Hadronic Processes
Re: None low energy Xe-Xe full cascade: what's the best physics list? (Ricardo Pinho)
Date: 18 May, 2007
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Wed, 16 May 2007, Ricardo Pinho wrote:

> *** Discussion title: Hadronic Processes
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/hadronprocess/690"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hi!
> 
> This a very straightforward and simple question so I hope I get some
> feedback, especially from you VI.
> 
> I'm doing a low energy Xe full cascade. As I guess this doesn't exist in
> Geant4 I'll implement it. Still, I need the Xe-ion -> Xe-atom/nucleus
> scattering process, so my question is what's the best physics process to
> use as It seems to be a huge variety of Hadron/Ion elastic/inelastic
> scattering/collision processes in Geant4 ?
> 
> I will of course also need the cross sections. The idea is to permit
> nuclear recoils, obviously, with the final goal of a full cascade.
> 
> When I say low energy I mean bellow 150 keV, for example.
> 
> Thanks in advance, hope to get an answer, ricardo pinho, LIP-Coimbra.
> 

Hello Ricardo,

If your interest is concentrated to energy of Xe ion below 150 keV, than 
there is no Xe nuclear cascade at all because of Coulomb barier. The only 
processes are scattering and ionisation.

In both standrad and low-energy implementation ion scattering is taken 
into account in average as a nucleat=r stopping power. This may provide 
simulation of ranges but not recoil. 

Unfortunatelly, we have no adequate scattering process so far.
There is a new process G4CoulombScattering, which simulates single 
scattering of charged particle with recoil. It was tested only for 
relatively high energy and only for electrons, muons, and protons. never 
for ions. Just now I cannot tell you is it applicable for low energy ions 
or not (currently I am very busy with other things).

So, in this area extra development is required. 

best regards,

-- 
    Vladimir Ivanchenko  
    ### CERN PH SFT Tel: +41-22-76-78-871  Vladimir.Ivantchenko@cern.ch ###

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