RE: FW: changing cross section values

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
case.

Cheers
Stefan

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
> https://www.fluka.org/free_download/course/portugal2010/Lectures/AdvancedSettings2010.pdf
> 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: fluka-discuss_at_fluka.org; 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: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Chrysostomos Valderanis
>> Sent: 26 November 2010 20:17
>> To: fluka-discuss_at_fluka.org
>> 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