Re: [fluka-discuss]: Fragmentation by Fluka in DPMJet

From: Paola Sala <>
Date: Mon, 3 Nov 2014 14:51:04 +0100

Dear Sourav,
Some time is needed perform full checks and understand all details, so I
would like to ask you for a few days of patience before a real answer can
be given. A first guess could be that the behaviour is due to binding
energy losses amplified by the Lorentz boost.
One sure point is that energy and momentum are conserved within rounding
errors in every interaction.
May I ask you a couple of details to better understand your plot?
What do you give exactly as initial energy? Is sqrt(s)=200 GeV, or is two
times p=100GeV/c? This question comes because in your plot the average
momentum at target mass is larger than 100 GeV/c.
Did you enable the evaporation of heavy fragments (physics 3 evaporat)?
Is your plot built with momenta as given at the exit from dpmjet, or after
Thank you
> Dear Fluka users,
> Recently I used DPMJet with Fluka interfaced to it for simulating Au +
> Au collision at C.M. energy of 200 GeV/nucleon. However the non
> interacting part of Au nuclei (spectators) has average energy less than
> 100 GeV/nucleon which is something strange. We expect to see average
> energy per nucleon for spectators as 100 GeV. As Fluka is used for
> fragmentation in DPMJet so have been wondering what could be the reason
> for average energy loss. I have attached a slide with the plots showing
> this feature. Any comment or insight on this issue will be really
> helpful.
> Thanks
> -Sourav

Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148
Received on Mon Nov 03 2014 - 17:26:01 CET

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