Re: [fluka-discuss]: Radioactive decay

From: Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch>
Date: Thu, 12 Apr 2018 12:53:16 +0000

Dear Guanying,
could you provide you input and user routines?
Thanks, luigi

> On 10 Apr 2018, at 22:01, Zhu, Guanying <zhu.1475_at_buckeyemail.osu.edu> wrote:
>
> Dear fluka experts,
>
> I’m trying to simulate beta decay of various isotopes. I basically request decay with RADDECAY card, record daughter nuclei with usrrnc.f, and record decay secondaries with mgdraw.f.
>
> It works for most isotopes, i.e.,
> When I set beam particle as certain isotope, I can see all of them decay, both the daughter nuclei and the beta spectrum are consistent with NNDC.
>
> However, for some isotopes, it doesn’t seem right. Here is what I noticed:
> 1) If I start with 11Be, then I see all of them successfully make 11B (from usrrnc.f output). However, I can’t find beta with mgdraw. [ do ip = 1, np; print kpart(ip), tki(ip) ]
> 2) If I start with 11Li (90% beta+neutron decay to 10Be; 10% beta decay to 11Be), then I do see 10Be and 11Be from usrrnc. One thing weird is that not all of them decay, some 11Li seem to do nothing at all. And if I look into the decay secondaries, there are only electrons plus neutrinos. I’m not sure why neutrons and gammas are not in the output. The beta energy spectrum doesn’t seem correct either. I see a cutoff around 10 MeV, while the Q value is actually around 20 MeV.
> 3) 17N is also a beta+neutron decay isotope, and fluka works fine on that.
>
> It would be really appreciated if anyone could help me understand the decay process in Fluka, or does anyone know if I could find the decay database that Fluka is currently using?
>
>
>
>
>
> Thank you!
>
> Guanying(�Ƨ��ځ맲��r���*'~�&������x%��Z�m��������?~[�j�i�֜r)

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Received on Thu Apr 12 2018 - 16:25:27 CEST