[fluka-discuss]: RE: Residual nuclei calculation: models or data libraries?

From: Chris Theis <Christian.Theis_at_cern.ch>
Date: Tue, 2 Sep 2014 10:47:32 +0000

Dear Gabriele,

you can find an answer to your question in the discussion archive at:


Regarding the models, FLUKA uses its own model which is called PEANUT. You can find the respective references to the publications on the FLUKA website in the reference section.

Best regards

From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Firpo Gabriele
Sent: 02 September 2014 12:07
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: Residual nuclei calculation: models or data libraries?

Dear Fluka users,

I know that the capability to score the residual nuclei has been implemented into FLUKA with an analytical solution of the Bateman equations describing activity build-up and decay during irradiation and cooling down, for arbitrary irradiation conditions.

As it is well known, the Bateman equation for the concentration Ni of isotope i in a material subject to a particle flux reads as

where λd are decay constants , φ(E,t) is the magnitude of the particle flux of energy E and σij is the particle cross section for transmutation from isotope j to i (The sum is to be taken over all other nuclides j present in the material).

The question is: depending on particle irradiating type (neutron and proton in particular), does Fluka use data libraries and/or models to set the σij parameters on the Bateman equation? I suggest that data libraries are used for “low-energetic” neutrons (E<20 MeV) and models elsewhere. Is that true? If so, which kind of data libraries and models are used?


Gabriele Firpo
Unità Reattori e Sicurezza – Reactor and Safety Engineer

C.so F.M. Perrone, 25

16152 Genova - Italia

Ph: +39.010.655.83.42



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Received on Tue Sep 02 2014 - 14:16:48 CEST

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