From: Florian (florian.sommerer@cern.ch)
Date: Wed May 02 2007 - 15:48:36 CEST
Dear Vincent,
if you look in at the end of the *.out file you will find the message:
**** Low energy neutron xsec not found for some media 0 1 ****
URANIUM
That means that you have not set the correspondence between FLUKA
materials and low-energy neutron cross-sections. For CARBON it is done
automatically. For Uranium you have to set the correspondence with a
LOW-MAT card. For example:
LOW-MAT URANIUM 92.0 238.0 293.0 238-U
c.f the manual for the explanation of the numbers.
If you are use Flair it is easier: you have to add a LOW-MAT card and
chose from the pull-down menu for "Mat:" "URANIUM" and from the
pull-down menu for "Low-Mat:" the right isotope and temperature.
Regards, Florian
Feracci Vincent wrote:
> Hi,
> I am working on a simulation of an uranium target bombarded by
> neutrons and being quite new with FLUKA I can't seem to use other
> materials than those predefined by FLUKA:
> In this early simulation I am bombarding a cylindric target with a 40
> MeV neutron beam. The simulation works fine with a carbon target but as
> soon as I try using Uranium or any other material FLUKA doesn't generate
> anything but a log file and rangeomneut_u001 (geomneut_u being my input
> file).
> I have attached geomneut_u.inp which is my file with an uranium
> target which doesn't work and geomneut_c.inp which is the same file with
> a carbon target and which works okay.
> I use Flair V 0.4 to run my simulations, could that be a source of
> problem?
>
> Would somebody be kind enough to tell me what's wrong with my simulation?
> Thank you very much for your attention,
> Vincent Feracci
-- ########################################### Florian Sommerer European Organization for Nuclear Research CERN DSU/TT Mailbox Z08700 Geneve 23 CH-1211 Switzerland Tel : +41 2276 75582 ###########################################
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