Dear Andrea,
thank you so much for the help and the advice! The results I'm comparing
with are presented as [x10^-24/nuclide/source neutron] (I suppose the
10^-24 stands for barn). Thus I thought there is no need to normalize it.
Anyway normalizing it made the results to differ even with additional one
order of magnitude.
I also tried to change the irradiation profile but it doesn't seem to have
any effect - I get the same numbers. Is this expected for this model?
Maybe I should try to change the beam profile?
What should be scored in the Nb detector/foil is the isomer 92mNb. So I
also tried switching on the patching for isomers but it is probably
activated by default thus that didn't have effect.
To have proper results for 198Au I need much better statistics. Thus my
idea was to deal first with the 92mNb before running the model with more
primaries.
Best regards,
Angel
> Dear Angel,
> you are missing the correct volumes in the RESNUCLEI cards (that
> in your case are 0.1 for NbDet and 0.00025 for AuDet regions). This
volume is used to normalized the results and is needed if you want to
compare with experimental results. If you add the correct values, you
should get more reasonable results.
> Other minor things I noticed in your input:
> - when defining a material, if you need the natural isotopic
> composition, use WHAT(6)=0 and do not specify WHAT(2)
> (see also the manual);
> - you can skip Z definition in a MATERIAL for a COMPOUND:
> it is ignored.
> I attach a revised copy of the input file.
> Hope this helps,
> Andrea
> Il 30/10/2018 13:21, Angel Demerdzhiev ha scritto:
>> Dear FLUKA experts and users,
>> I am a beginner trying to calculate the reaction rates at different depths
>> in a concrete block in Nb and Au activation foil for a 14.1 MeV neutron
source.
>> For a reason not known to me I get results which differ in two orders
of
>> magnitude of what is expected. Can you take a squiz at my .inp file and
tell me if I am doing anything wrong.
>> Kind regards,
>> Angel
> --
> ========================================================================
Dr. Andrea Fontana tel: +39 0382 987991
> Istituto Nazionale fax: +39 0382 423241
> di Fisica Nucleare
> Sezione di Pavia e-mail: andrea.fontana_at_pv.infn.it
Via Bassi 6 web : www.pv.infn.it/~fontana
27100 PAVIA, Italy
> ========================================================================
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Received on Wed Oct 31 2018 - 12:20:02 CET