Re: Documentation on SPECSOUR

From: Samuel Hedges <>
Date: Tue, 31 Jul 2012 17:54:31 -0700

Dear Stefan Roesler,

I am using FLUKA to characterize the response of a luminosity monitor
to pp and heavy-ion collisions, and had a few questions after seeing
your post. I'm trying to understand which cross sections DPMJET uses
for collisions. Francesco had mentioned that DPMJET doesn't simulate
electromagnetic dissociations for heavy ion collisions. Are the only
interactions for these collisions inelastic? I ask because we thought
we saw an elastic peak near the beam energy in the attached graph:

I found a publication on DPMJET that states "Gribov-Glauber multiple
scattering formalism...allows the calculation of total, elastic,
quasi-elastic, and production cross sections for any high-energy
nuclear collision."
( I
was hoping you might be able to help clarify which types of
interactions DPMJET simulates and the cross sections it uses.

I found Glauber cross sections for some of the collisions I am running
here: Are these the cross
sections that are used by DPMJET?

I appreciate your help. Thank you,

Samuel Hedges

On Sun, Jun 10, 2012 at 1:59 PM, Stefan Roesler <> wrote:
> Hi Paul
> The event-generator is DPMJET-III; please don't forget to link it with
> ldpmqmd. It simulates inelastic (including diffractive) events. Elastic
> pp scattering is not treated. You can find more info on DPMJET in the
> respective literature.
> In order to score particles emerging directly from the pp collisions I
> suggest that define a small sphere (region) around the interaction point
> and score at this new boundary with any of the usual scorings (USRBDX,
> Cheers
> Stefan
> On Sun, 10 Jun 2012, Paul Miyagawa wrote:
>> Hello,
>> I would like to try using proton-proton collisions using the SPECSOUR
>> card below. However, I haven't managed to find any documentation on the
>> actual physics behind it (e.g., generator, cross-section, what
>> processes, in particular elastic scattering?, DPMJET?). How can I get
>> more information about the generated events before the detector
>> simulation? Thanks for any suggestions.
>> SPECSOUR 0.0 0.0 4000.9382 0.0 0.0-4000.9382PPSOURCE
>> Regards,
>> Paul
Received on Wed Aug 01 2012 - 10:40:24 CEST

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