Re: Identifying stopped particles

From: Francesco Cerutti (
Date: Tue Nov 27 2007 - 11:17:30 CET

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    >From Alberto Fasso' <>


    Heavy charged particles (hadrons and muons) are normally never "stopped"
    in FLUKA, but once they have reached the energy cutoff they are ranged out
    to rest. I use the word "stopped" in the sense of "their energy is deposited
    at one point", which corresponds to mgdraw ICODE 12 (ENTRY ENDRAW). Instead,
    their energy is deposited continuously along the residual range, which
    corresponds to mgdraw ICODE 1 (ENTRY MGDRAW).
    However, there is a way to find out that the history of a heavy charged
    particle is ended: there is a call to MGDRAW at the end of the range,
    with the particle momentum (PTRACK) equal to zero and the total energy
    (ETRACK) equal to the particle mass.

    An exception is if the energy cutoff has been set by the user > 0.1 GeV.
    In this case no ranging out is done and ICODE 12 should appear (you may
    try it).

    The situation is different for electrons/positrons, as you have noticed.
    (Ranging out is not done, mainly because it is difficult to define with
    precision a residual range).

    Still different is the situation for a particle which decays or interacts
    with a nucleus at the end of its range. In the first case, after the final
    step call to MGDRAW, there is a call to USDRAW with ICODE 102; in the second
    case, with ICODE 101.


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