Dear Konstantin,
As already pointed out in the Email below, you have to use the PHOTONUC card in order to activate photo-nuclear interactions. However, there is another issue with the DEFAULTS card: you are using SDUM=NEUTRONS which is only suitable for pure low-energy neutron simulations while electrons are not transported in this case (they are dumped at the spot). Rather use PRECISIO on the DEFAULTS card.
Another important point to consider is that photo-nuclear interactions have small cross sections, so it is recommended to use the LAM-BIAS card for the target in order to bias the interaction length (see the PHOTONUC and LAM-BIAS description in the manual).
Cheers, Anton
________________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Sébastien Wurth [wurth_at_ipno.in2p3.fr]
Sent: 05 December 2017 11:49
To: Konstantin Rönsch; fluka-discuss_at_fluka.org
Subject: Re: [fluka-discuss]: Problem with neutron radiation and the Nuclear Photoeffect
Hello Konstantin,
Photonuclear reactions have to be turned on in FLUKA since they are not
by default. See PHOTONUC and PHYSICS cards sections in the manual.
Hope it helps.
Best.
Sebastien.
Le 05/12/17 ŕ 10:24, Konstantin Rönsch a écrit :
> Dear Fluka and Flair experts,
>
> as a student at TU Ilmenau, Germany, I am currently working on the
> simulation of a Linac-Head.
> I want to shoot an 15 MeV electron-beam at a Tungsten-Copper target
> and simulate the neutran radiation that occurs because of the Nuclear
> Photoeffect.
>
> Unfortunately none of the different produced detectors detected a
> neutron radiation,
> even when I choose a high number of particals or a very high electron
> energy.
> I use the Fluka through the Flair Program and a VMBox.
> Is it possible that Fluka does not take into consideration the Nuclear
> Photoeffect,
> or could anyone find a mistake with the Input-File?
> I would be very thankful for any feedback or hint.
> Yours sincerely,
> Konstantin Rönsch,
> TU Ilmenai, Biomedical Engineering.
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Received on Sun Dec 10 2017 - 19:23:22 CET