Re: event by event low energy neutrons scoring

From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Thu Nov 15 2007 - 03:34:31 CET

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    On Wed, 14 Nov 2007, wrote:
    > I'd like to use Fluka but before starting
    > I've the following question :
    > I need to score , event by event , the low energy neutrons
    > exiting from a calorimeter (or passing through a volume around
    > it) , recording for each event the multiplicity
    > and the energies of the neutrons. Is it possible or in some
    > way this kind of scoring is meaningfull due to multigroup
    > low-energy neutrons transport ?
    > which is the best approach for such scoring , is it possible with
    > EVENTBIN ?
    > best regards Sergio Bottai

    You can use EVENTBIN, but take into account the following:
    1) The energy of the neutrons escaping from the calorimeter is
        not known exactly, but is known only with a resolution equal to
        the width of the energy groups
    2) EVENTBIN, like USRBIN, does not score the number of neutrons
        per event, but the neutron tracklength in a specified bin (or
        in a specified region, if you chose region binning)

    Remark number 1) is valid in any case, independent of the command
    you use. The neutron energy is not known better than the group width
    even inside the program itself.

    You can avoid the problem described in remark number 2)
    by using instead USERDUMP and writing a user routine mgdraw.f.
    In this case you can get the actual number of escaping neutrons,
    doing some programming after ENTRY BXDRAW (boundary crossing)
    and after ENTRY EEDRAW (end of event).


    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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