RE: FW: changing cross section values

From: Stefan Roesler <>
Date: Tue, 30 Nov 2010 14:57:50 +0100

Dear Makis

The discrepancy for light fragments is partially due to the lack of a
multi-fragmentation model. I think it has never been claimed to be within
30% in that region.

There is no possibility to "bias" it directly in FLUKA. Of course, the
user is free to enter corrections via user-routines or offline
normalization of results but it cannot be called FLUKA prediction in this


On Tue, 30 Nov 2010, Chrysostomos Valderanis wrote:

> 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 (158GeV 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,
> Makis
> ________________________________________
> 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.
> Cheers
> Stefan
>> -----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 - 14:56:31 CET

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