RE : [fluka-discuss]: alpha and tritium production from Li-6 (pwxs)

From: Ferrari Alfredo <alfredoferrari_at_orange.fr>
Date: Tue, 12 Nov 2024 14:41:46 +0100 (CET)
Dear Federico

The difference is due to the different range of 3H and 4He, some of them can indeed escape from the (tiny) LiF.
Given the different charge and energy split, 3H's from 6Li(n,3H)4He have a longer range than 4He's, and therefore are escaping somewhat more.

If you look in the output towards the end where the stopping particle are listed regardless of "where", you'll find that the numbers are identical.

This shows once more the importance of pointwise fully correlated, with groupwise the 3H and 4He are not explicitly generated and trsnasported, ergo they are dumped on place.

Ciao
Alfredo

Le : 11 novembre 2024 à 10:52 (GMT +01:00)
De : "Federico Chiarelli" <Federico.Chiarelli_at_lnf.infn.it>
À : "Alfredo Ferrari" <alfredo.ferrari_at_mi.infn.it>
Cc : "Fluka Discuss" <fluka-discuss@fluka.org>
Objet : [fluka-discuss]: alpha and tritium production from Li-6 (pwxs)


Dear Alfredo,

I am contacting you regarding a potential small issue I have encountered
in FLUKA.
I have created an input file designed for calculating the response
function in Lithium Iodide within a Bonner sphere using the RESNUCLEI
card. When I use multigroup transport, the number of tritium and alpha
nuclei generated is the same, as expected physically from the neutron
absorption reaction with Li-6.
However, when I use the pointwise cross-sections, the number of tritium
and alpha nuclei produced is different.
Am I making an error in setting up the input, or is there some process I
might be overlooking?

For better understanding, I am attaching the input file and the _sum.lis
files obtained in both cases.

Thank you in advance for your response.

Best regards,

--
Federico Chiarelli
INFN - Laboratori Nazionali di Frascati
Esperto di Radioprotezione di III grado n. 882

Via Enrico Fermi 54
00044 - Frascati (Roma)
0694032104
0694038338
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