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Forum: Hadronic Processes
Re: Question High energy PB ion physics? (Paul Anton)
Date: 22 Nov, 2007
From: Gunter Folger <Gunter Folger>

Hello Paul,

We do not have any model implemented in Geant4 for inelastic collisions 
of ions at high energies. Developments for this are under discussion, 
but any implementation will take some time.

We are also discussing to implement interfaces to existing external 
codes , especially for ion induced reactions. This could be available on 
a shorter timescale, but we would only provide an interface, not the 
needed external code. A college has an interface for JQMD; this is able 
to handle ion interaction, but according to documentation not at the 
energies you would need. I believe QGSJET is valid for at your energies, 
but we do not have an interface; there is interest in this however 
elsewhere within the collaboration.

Please contact me directly to discuss options how to proceed.

Regards, Gunter

Paul Anton wrote:
> *** Discussion title: Hadronic Processes
> Email replies to must include:
>   In-Reply-To: <"/hadronprocess/843">
>   Subject: ...change this to be about your reply.
> Hello,
> I am currently investigating energy deposition in a beam scraper (a
> small "collimator") in CERN's SPS accelerator. Basically, I want to see
> what happens when a beam of 177 GeV/nucleon Pb-82+ hits this beam
> scraper, made of copper.
> I have already done simulations with 450 GeV protons, and it looks
> fairly good. The problem is that I use the QGSP physics list, and for
> generic ions this list only includes the processes G4MultipleScattering
> and G4ionIonisation. ( URL :
> ) I would also like to see some nuclear inelastic collisions. Ten-digit
> accuracy is not interesting, but as a minimum I would like to find the
> average energy deposited in the beam scraper per lead ion, plus/minus,
> say, 25%. I have a feeling that inelastic collisions will add a huge
> amount of energy deposited (this is at least the case with protons!!)
> I have searched this forum, but the only relevant discussion I see is
> from 2004 and concludes that there is no such physics functionality yet.
> Appreciate any help on this!


Gunter Folger                        e-mail:
CERN PH/SFT                           phone:  (41)-22-76 79 778

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