Dear Tamer
Your userbin are of type "XYZ Point" and "Region" . With this choice, the
quantity scored is the number of stars produced by the selected particle
(see the manual), where star means inelastic interaction. It means, that
you are requesting the scoring of muon photonuclear reactions, which are
very unlikely...and give no information about the muon flux.
If you wish to score muon fluence, you should use the "distributed"
quantities (what(1)=10 or 11).
If you wish to compare with your boundary crossing in usermed.f, why not
using USRBDX? This will provide you the muon fluence vs. energy entering
and exiting your beam dump. USRBIN instead will give a spatial
distribution of fluence, integrated over energy.
Then: why would you need different PHYSICS for different SCORING? The
physics setting should be chosen as the best to reproduce the experimental
conditions, independently on scoring. And, if you wish to activate muon
photonuclear reactions, you should add a MUPHOTON card (PHOTONUC is for
photon induced nuclear interactions)
Hope this helps
PAola
> Dear FLUKA experts,
>
> I am scoring muons (and other particles) that are produced from pion
> decays, which are produced from 2.5 GeV protons interacting with a Ti
> target in the middle of a magnetic focusing horn, at the level of a beam
> dump, which is at 25 meter a way from the target.
>
> I use two methods to score the muons:
>
> 1- via usrmed.f routine (attached), which scores the number of particles
> and their energies at three boundaries; 1- between the decay tunnel and
> the beam dump core-front side (i.e. particles entering the beam dump
> core), 2- between the beam dump core-back side and the dump back
> shielding (i.e. particles passing through/exiting the dump core), and 3-
> behind the beam dump.
>
> 2- via USRBIN scoring cards.
>
> I used the same *.inp code for both studies, i.e. all nodes are same
> except for the Physics and Scoring nodes had to be modified with respect
> to the need of each method. To avoid confusion with the large *.inp
> file, attached you will find slides showing the main features applied
> for each of the two different node.
>
> using the usrmed.f routine I do record some "few tens" muons (with E
> _kin < 500 MeV) entering (i.e. boundary #1 above) and some "handful"
> exiting (i.e. at boundary #2) the beam dump. While scoring with USRBIN
> cards in side the beam dump (in both ways; coordinate and region),
> _nothing comes out_. What could be my mistake in scoring via the usrbin?
>
> With my best regards,
>
> Tamer
>
> --
> Dr. Tamer Tolba
> Institut für Experimentalphysik,
> Universität Hamburg ,
> Luruper Chaussee 149,
> 22761 Hamburg - Germany
>
> Tel.: +49 (0)40-8998-4872
>
>
Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148
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Received on Wed Sep 09 2020 - 18:31:36 CEST