Re: [fluka-discuss]: What particle crosses a boundary

From: Santana, Mario <msantana_at_slac.stanford.edu>
Date: Sat, 1 Mar 2014 22:25:31 -0800

Joseph,

Within mgdraw.f are you sure your particle printing statements are in
BXDRAW?

Mario


On 3/1/14 3:23 PM, "Joseph Comfort" <Joseph.Comfort_at_asu.edu> wrote:

>I sometimes use boundary crossings as a means to identify the particle
>that reached a boundary (detector). There are some problems.
>
>The setup is very simple: A line beam of 1-GeV/c particles travel 2000
>cm
>in vacuum before hitting a square 'target'. The target has either copper
>or vacuum. Mgdraw is used to select on particle crossings from the
>vacuum _into_ the target, and each particle type is recorded.
>
>100,000 pi+ beam on 1-cm-thick copper: 72,835 particles enter the
>target.
>That is OK. In addition to pi+, mu+, and 2 e+, there are 9 photons and 5
>pi-. How can pi+ decays produce photons and pi- in vacuum? (The vacuum
>target gives only pi+ and mu+.)
>
>1 million K0Long beam on 5-cm-thick copper: 542,355 particles enter the
>target. They include e-, e+, gamma, mu+, mu-, K0, and K0bar (also true
>for vacuum target). But there are also 26 protons and 38 neutrons!
>How can a K0L produce a p or n in vacuum?
>
>It appears that JTRACK does not identify the particle that hit and
>crossed
>the boundary, but rather something after interactions somewhere in the
>medium. In the case of several produced particles, which one is chosen?
>
>How can the particle that hit the boundary be identified?
>
>Joe Comfort
>
Received on Sun Mar 02 2014 - 08:37:46 CET

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