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