From: paola sala (paola.sala@cern.ch)
Date: Fri Feb 16 2007 - 22:00:28 CET
Hi Lindley,
yes, you are missing interactions from low energy neutrons: they are not
considered in the "inelastic interactions" usryield scoring. The
problem, however, is that this use of USRYIELD in a thick target makes
no sense ( as you already realized). This option is useful for thin
target studies, when the interest is on one specific reaction.
In a full shower, the quantity that better characterizes the particle
fields is the fluence, that you can score either with USRBIN or with
USRTRACK ( this last gives also an energy spectrum). Fluence is the
quantity directly related to the response of a detector exposed to the
particle field.
( parenthesis : be sure to activate also photon induced nuclear
interactions, they play a non-negligible role in problems involving muon
induced showers)
Paola
On Thu, 2007-02-15 at 15:53 -0800, Lindley Winslow wrote:
> Hello all,
>
> This is a followup to a previous post about using USRYIELD to score
> particle yields and possible double counting. My goal is to score
> both particles made in muon and secondary interactions.
>
> The previous post can be found here:
> http://www.fluka.org/web_archive/earchive/new-fluka-discuss/0793.html
>
> I wrote a user defined routine to correct for scoring of particles'
> scattering, spallation etc. which brought my results with ~10% of the
> published result at 270GeV. I then tried to reproduce results for
> 10.3GeV muons and I am getting 1.4 instead of 2.5 n per muon g/cm2
> and 0.1 instead of 0.3 pion+ per muon g/cm2.
>
> I realized by scoring inelastic collisions I was missing particle
> decays which I thought was a small correction. I think I may also be
> missing particles created in Low Energy Neutron interactions. If so
> what is the proper way to score these particles? or may be more
> generally what is the proper way to score particle yields in thick
> detectors? (Detectors where total amount produced is more important
> than what escapes).
>
> Thank you,
> Lindley
>
>
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