RE: FW: changing cross section values

From: Chrysostomos Valderanis <>
Date: Tue, 30 Nov 2010 12:50:53 +0000

Dear Stefan,

Thank you very much for answer. I am reading the references. But I would
like to have a little clarification. I saw in Fluka's last course page 30 of
a comparison between data and Fluka. If I interpret the plot correctly
(158 GeV Pb on C) I see a difference between data and simulation up to a factor
of 3-4 for light ions. I was under the impression that Fluka's accuracy was about 30%.
Is there a way to bias my simulation to take into account this factor?

Thank you,

From: Stefan Roesler
Sent: 30 November 2010 11:29
To:; Chrysostomos Valderanis
Subject: Re: FW: changing cross section values

Dear Makis

FLUKA is not using the EPAX or any other parametrization of fragmentation
cross sections.

The production of individual fragments in a heavy ion collision is
directly predicted by the FLUKA interaction models. Thus, the cross
section follows from the probability that the model produces a certain
fragment and the inelastic interaction cross section. The latter are based
on parametrized predictions by DPMJET-III at high energy and a modified
universal parametrizations by R.Tripathi et al (NASA Technical Report
3621, 1997). Details can be found in

V.Andersen et al, The FLUKA code for space applications: recent
developments, Advances in Space Research 34 (2004) 1302

Therefore, the fragmentation cross sections are FLUKA predictions and
cannot be modified by the user.


> -----Original Message-----
> From: [] On Behalf Of Chrysostomos Valderanis
> Sent: 26 November 2010 20:17
> To:
> Subject: changing cross section values
> Hello,
> I would like to know if Fluka is using the EPAX parametrization for ion
> cross sections. IF it is using something else could you point me to it?
> Another question is the following. Assuming that I would like to change
> some values for specific cross sections, is there an easy way to do it?
> thank you in advance,
> Makis
Received on Wed Dec 01 2010 - 14:59:26 CET

This archive was generated by hypermail 2.2.0 : Wed Dec 01 2010 - 14:59:56 CET