Date: Mon, 15 Apr 2013 19:39:56 +0900
Dear Fluka Users/Experts & Santana Mario,
Actually the problem, we have with LIF-converter is; we can¡¯t use it in FLUKA, as LIF is compound material.
If you have a look at the FLUKA Manual at page 159; (Notes section 4), notifies
that:
(Not Implemented!) If
WHAT(5) is set > 0.0 because a pre-mixed compound low-energy neutron material
is used, average
cross sections are used (as for instance in the Morse code). Otherwise, if each of the Fluka
elemental components
has been associated with one of the elemental low-energy neutron components and the
composition of the
compound has been dened by a COMPOUND option, low-energy neutron interactions will
take place randomly
with each individual component, with the appropriate probability.
(1) We used the following
mechanism to detect thermal neutrons via 3Li7- converter-based PPAC detector.
Neutrons + Li
----------? H3 + He4
Our
problem is we can easily detect secondary particles of the incident thermal neutrons at the converter layer.
However if we try to detect at the gas-gap (Isobutane) we can find the secondary particles there, why we cant detects
them at the PPAC¡¯s gas gap?
We will keep waiting for the reply!
Dr. M. Jamil and Kim Hyun Gee
Konkuk
University,
EMail:
mjamil_at_konkuk.ac.kr