Dear Francesco, dear Kriti
thanks for the quick replies. This explains a lot. For me, three
questions remain:
- What happens to secondary deuterons that are produced during nuclear
reactions? Are these not tracked at all if they have a lower energy than
200 MeV?
- In a simulation of deuterons (28 MeV) on a Al-alloy, I get results in
form of radioactive nuclei. What is Fluka doing? Where do they come from?
- Is support for deuterons planned in the future?
Best regards
Marius Arenz
On 24.10.19 17:06, Francesco Cerutti wrote:
>
> Dear all,
>
> note that (low energy) deuteron interactions are simply not implemented,
> as formerly recalled:
> http://www.fluka.org/web_archive/earchive/new-fluka-discuss/8921.html
>
> At higher energies, they are crudely performed by the rQMD module in its
> application range, i.e. above 200 MeV deuteron energy.
>
> Kind regards
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> Esplanade des Particules 1
> 1211 Geneva 23
> Switzerland
> tel. +41 22 7678962
>
> On Thu, 24 Oct 2019, Kriti Gupta wrote:
>
>> Hi Marius,
>>
>> In your RESNUCLE card, you have not specified WHAT(3), that is the
>> max. Z for the activated nuclei. Default is max. Z of all elements in
>> the system, which in your case is Z=7. To get activation for O and F
>> products, you need to have atleast Z=9.
>>
>> Hope it helps.
>>
>> Best regards,
>> Kriti Gupta
>>
>> -----Original Message-----
>> From: owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it>
>> On Behalf Of Marius Arenz
>> Sent: 24 October 2019 14:49
>> To: fluka discuss <fluka-discuss_at_fluka.org>
>> Subject: [fluka-discuss]: Deuteron activation of N
>>
>> Dear Fluka users,
>>
>> I am using Fluka for simulations of activation in various particle
>> beams. At the moment, I am particularly interested in the activation
>> of air. I used 14 MeV proton, 28 MeV deuteron and 56 MeV alpha beams
>> for my simulations. While obtaining reasonable results for protons and
>> alphas, the result for deuterons was no activation at all. This result
>> is in contrast to my expectations and to cross section values given
>> e.g. here:
>> http://www.oecd-nea.org/janisweb/
>> for e.g. deuteron induced reactions like N14 (d,n) O15, C12 (d,n) N13 or
>> O16 (d,n) F17 just to name a few. All these cross sections differ
>> significantly from zero for deuteron energies below 28 MeV.
>>
>> I am not a long-term Fluka user and I was not able to find the mistake
>> in my input file, hence, I decided to ask this question to the mailing
>> list.
>>
>> To give a minimal example, I have simplified the geometry and setup to
>> a deuteron irradiation of Nitrogen in a 4 m cylindrical black hole
>> container. The four metre length should allow for all deuterons to be
>> stopped. From the cross sections I would at least expect the N14 (d,n)
>> O15 reaction to happen and produce a significant amount of F17.
>> What I get is a small amount of 11C with an uncertainty of 99% despite
>> 40 cycles with 10^7 primaries. According to
>> http://www.oecd-nea.org/janisweb/ , N14 (d,n + alpha) C11 is a
>> possible reaction. However, the cross section is not significantly
>> higher than the well-documented N14 (d,n) O15 reaction which is not
>> happening at all.
>> Additionally there are some N14 (n, something) something reactions
>> possible that do not seem to take place.
>>
>> I expect some basic mistake in my input file that I fail to find myself.
>> I'd be grateful if someone would point me towards the origin of the
>> problem or maybe even present a solution. I'm appending my input and
>> the tab.lis file.
>>
>> Thank you very much.
>> Best regards
>>
>> Marius Arenz
>>
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Received on Thu Oct 24 2019 - 19:19:07 CEST