Re: [fluka-discuss]: energy information of fission products

From: Anna Ferrari <a.ferrari_at_hzdr.de>
Date: Sat, 02 Nov 2013 05:04:26 +0100

Dear Milena,

almost right :-).
(FHEAVY) and (TRACKR) are exactly what you want but they are not user
routines,
they are include files (you can find it in $FLUPRO/flukapro and give a look
at the stored variables):

(TRACKR) is intended to store the properties of the currently
          transported particle;
(FHEAVY) is the stack of the heavy secondaries created in nuclear evaporation.

(FHEAVY) is intended to store fission/fragmentation products when they are
generated in an inelastic interaction. You can inspect it after such an
interaction in the MGDRAW user routine, entry USDRAW. There you can retrieve
the information you need, for example their total energy/momentum from ETRACK
in (TRACKR) and AMNHEA(-JTRACK) in (FHEAVY) (with JTRACK -the identity number
of the particle- from (TRACKR)).

I think that you could extract complementary useful informations also in a
completely different way, without intercepting the tracking but using the
FLUKA scoring cards. You could find useful to study the tracklength density in
the two materials and the fluence of the different secondaries.
Last: if you want to activate the transport of ions remember to do it via the
card IONTRANS.
Also: nucleus-nucleus interactions at energies larger than 100MeV/n are
performed provided that the external event generators DPMJET and RQMD are
linked.

Maybe the big experts like to add something more...

Hope it helps,
kind regards,
Anna




Am Sun, 27 Oct 2013 10:50:50 +0000 schrieb Milena Quittnat
<milena.eleonore.quittnat_at_cern.ch>:
>
> Dear FLUKA experts,
>
> I am studying hadron-irradiated inorganic scintillator materials (PbWO4,
>LYSO) with FLUKA.
>For PbWO4, the hadrons undergo fission with lead or tungsten and the created
>nuclear fragments cause a very high ionisation along their path in the
>crystal. This leads to a permanent transmission loss.
> Measurements show that the transmission loss (more precisely the
>radiation-induced absorption coefficient) as a function of the cumulative
>proton fluence is a factor 5 less for LYSO than for PbWO4. This factor is not
>directly reflected by the fission density or the displacement per atom of
>LYSO, which is only a factor 2 lower. The star density is even roughly the
>same for both materials. Apparently, the induced hadron damage is different
>for both materials and I would like to understand it a bit better.
> Is there a way to extract the energy information of the fission fragments in
>FLUKA?
> That would give me a good hint towards an explanation of the difference in
>the transmission loss.
> It would be interesting to score for example the track length per
>star/fission as a function of a critical energy.
> I was told that I could get the information in the user routine "fheavy" or
>"tracker", is that right?
>
> Thank you very much for your help
> Kind regards,
>
> Milena Quittnat
>



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dr. Anna Ferrari
Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf e.V.
Bautzner Landstraße 400
D - 01328 Dresden (Germany)
Tel. +49 351 260 2872
Received on Sat Nov 02 2013 - 05:52:02 CET