Dear Vladimir,
when I run your input files I do not observe absolutely different distributions.
What I see is that the distribution to the neutrons created in the Lead is identical in the two input files.
What does change is basically the fact that in the first input there is significant thermalization happening in the water and these neutrons are double backscattered and then measured from the usrbdx.
This is not happening in the second case.
In my opinion the results seem perfectly consistent.
Kind regards
Lefteris
-----------------------
Eleftherios Skordis
Dep. EN/STI, CERN
CH-1211 GENEVA 23
SWITZERLAND
OFFICE: +41-22-7679541
________________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of babintsev [babintsev_at_ihep.ru]
Sent: 13 February 2019 13:10
To: Fluka Discuss
Subject: [fluka-discuss]: neutron flux from Lead - how to explain it ?
Hi, experts.
I cannot explain results for neutron flux from Lead
I use ex-5-Tutorial.inp for slow neutron with small modifications:
1) test1.inp - geometry from tutorial : Pb + Water + Cd
2) test2.inp - new geometry -> add 1 (air) region : Pb + Air + Water + Cd
When I compare neutron distributions for (1) and (2) after Lead
I see absolutely different distributions !
For (1) it starts from E-12 GeV.... for (2) it starts from E-06 GeV
Could you please give the clue how to explain it ?
than you
Vladimir
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Received on Wed Feb 13 2019 - 19:28:56 CET