Re: event by event low energy neutrons scoring

From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Thu Nov 15 2007 - 18:21:35 CET

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    On Thu, 15 Nov 2007, Giuseppe Battistoni wrote (answering Sergio Bottai's

    > 2) you can use mgdraw with that caveat, but on top of this question of
    > histogramming, you have to take into account that even when you are not using
    > explicitly biasing techniques, low-energy neutrons might have a weight
    > different from one (Alberto can probably confirm this). In that case the
    > simple counting of neutrons is again meaningless. Each neutron has to be
    > accounted for using its weight. Again, this is something that you must
    > consider in your ntuples.
    > So, everything can be done, but this is a typical case in which, if you
    > prepare a scoring of your own, you must be very careful and check twice.

    Some biasing (non-analogue absorption) is indeed applied by default to
    low-energy neutron transport, but only if no DEFAULTS card is present, or when
    it is present with certain values of SDUM.
    But if a DEFAULTS card is present with SDUM=CALORIMEtry (as I think it would
    be natural in Sergio's case), or with SDUM=ICARUS, NEUTRONS or PRECISIOn,
    non-analogue absorption is not applied. The same situation can be obtained
    explicitely in any case, by issuing a card LOW-BIAS with WHAT(2) = 73.


    Alberto Fasso`
    SLAC-RP, MS 48, 2575 Sand Hill Road, Menlo Park CA 94025
    Phone: (1 650) 926 4762   Fax: (1 650) 926 3569

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