From: Ludwik Pienkowski (pienkows@slcj.uw.edu.pl)
Date: Mon Oct 20 2003 - 01:01:19 CEST
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:
1.ntest.inp
2.ntest001.log
3.mgdraw-ntest.f
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
Poland
pienkows@slcj.uw.edu.pl
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