Low energy Neutrons

From: Feracci Vincent (feracci@ganil.fr)
Date: Tue Jul 24 2007 - 16:24:32 CEST

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        I have a few questions about low energy neutrons :
    I am measuring low-energy neutron fluence (< 19,6 MeV) with USRTRACK and
    I would like to know if it is possible to change the energy boundaries
    of the measures as they are fixed by the boundaries of the 72 energy
    groups used to simulate low energy neutrons.

        Physically I would also like to understand some details on how does
    the multigroup model work : is the energy of a low-energy neutron set to
    a specific value according to the group he is currently in (i.e : under
    19,6 MeV the energy of a neutron can only take 72 different values) or
    has the neutron a value that can change inside a specific group (with
    the cross-section values being fixed in each energy group) ?
    If it is the latter case is it then possible to change the energy
    boundaries (and increase the number of steps) of detectors such as
    USRTRACK in these energy levels?

        If this is impossible due to the use of the 72-group ENEA library,
    is it possible to use another multigroup library with FLUKA (which would
    have more energy groups) ?
        Thank you for your attention,
    Vincent Feracci

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