energy leak

From: Ludwik Pienkowski (
Date: Mon Oct 20 2003 - 01:01:19 CEST

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    Dear FLUKA authors,

     I observe a strange energy leak for low energy neutrons.
    The neutrons of the energy 19.5 MeV irradiate a very large block
    of lead (ntest.inp and other files are attached to this email)
    and the secondaries emitted during the cascade were watched
    in the mgdraw routine using the entry USDRAW. The attention
    was put on (n,n') reactions, i.e. the reactions that only
    one neutron is emitted. It was noted that for many cases the
    emitted neutron kinetic energy is much smaller than the energy
    of the primary neutron. The results are shown in the ntest001.log
    file. For example the strange case is:
      event En En" tv tvcms tvheavy time
             (MeV) (MeV) (MeV) tvrecl tvbind (ns)
          2 19.50 0.95 0.17 0.00 0.00 0.00 0.00 0.27400
     The value of the En-En' is equal to 18.55 MeV and this energy
    is not shown in the other available variables. Where is this
    missing energy?
     The other strange result is as following:
      event En En" tv tvcms tvheavy time
             (MeV) (MeV) (MeV) tvrecl tvbind (ns)
          5 18.52 18.52 0.17 0.00 0.00 0.00 0.00 0.36955
     The energies of both neutrons are virtually equal each other,
    however, the variable tv (excitation energy) is 0.17 MeV. What
    is the source of this energy?

    Best regards,
    Ludwik Pienkowski

    P.S.The attached files:
    The program was linked and run with the commands:
     lfluka -o ntest -m fluka mgdraw-ntest.f
     rfluka -e ntest -N 0 -M 1 ntest

    Heavy Ion Laboratory
    Warsaw University
    ul. Pasteura 5A
    02-093 Warszawa

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