Dear Jilberto
you should rethink the volume of your scoring region. Very likely it is
too small to ever get one muon going thru in a reasonable cpu time since
you need to use a very extended atmospheric geometry on top ot it.
There are two ways out:
a) a preliminary run, scoring the muons on a much larger surface at ground
level (large enoguh to get statistics but still small enough to
assume the muon fluence is the same over it, the example is fine in this
respectd. The a second run with only the local geometry where you "launch"
from an ad hoc source the muons in the area just above your detector with
the proper energy and angle distributions (spataially uniform) as scored
in the first step
b) use some Monte Carlo tricks to increase you statistics, I suggest
to give a look at an old paper which could give you some ideas about
``Monte Carlo simulation of underground muon events in
a finite size detector'', Astroparticle Physics, 7, 101-108 (1997)
Alfredo
+----------------------------------------------------------------------+
| Alfredo Ferrari || Tel.: +41.22.76.76119 |
| CERN-EN/STI || Fax.: +41.22.76.69474 |
| 1211 Geneva 23 || e-mail: Alfredo.Ferrari_at_cern.ch |
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+----------------------------------------------------------------------+
On Thu, 22 Nov 2018, jilberto Zamora Saa wrote:
> Dear fluka experts:
>
> I'm trying to estimate the number of muons (cosmic rays) crossing a box (1x1x1 m^3), which is placed 50 m underground. In order to produce the muons, I'm running the gcrexampleAllParticle example. I already added to the example some layers: rock and air where I will place my box.
> However, when I running the simulation and scored the muons on the box, I got zero muons.
>
> I would like to ask if the procedure that I'm doing is reasonable or I should proceed in a different way?
>
> thank in advances,
> Jilberto
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Received on Thu Nov 22 2018 - 22:41:23 CET