Dear Francesco,
Thank you so much for your important information.
Best regards.
Trinh, GANIL, France
________________________________________
De : Francesco Cerutti [Francesco.Cerutti_at_cern.ch]
Envoyé : lundi 7 mars 2016 21:24
À : Trinh Ngoc-Duy
Cc : fluka-discuss_at_fluka.org
Objet : RE:[fluka-discuss]: Pre-equilibirium emission of low energy heavy ion reaction in FLUKA
Dear Trinh,
in fact BME pre-equilibrium emissions are not limited to the pre-computed
systems, but are extrapolated also for systems close enough in terms of
reduced mass and proton and neutron separation energies in the complete
fusion compound.
However, these are pre-equilibrium emissions from the complete fusion
compound.
In case of processes other than complete fusion (with the latter made
unlikely for U+U by the large charge of the interacting ions), BME yields
two or three excited bodies that in most cases (unless they can be thought
as the complete fusion compound of a known system) go directly to
evaporation/fission, with no pre-equilibrium emission. This limitation,
presently affecting your system, will be overcome with the next major
release, where the interface to the PEANUT pre-equilibrium has been
implemented for all excited bodies not treated through the BME database.
Kind regards
Francesco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854
On Mon, 7 Mar 2016, Trinh Ngoc-Duy wrote:
> Dear Francesco,
>
> Thank you very much for your answer.
>
> So if i understand well, BME simulates the pre equilibrium emission of
> reaction in the domaine of several representative systems :
>
> 16O + 6Li, 8Li, 8B, 10B, 12C, 14N, 16O, 19F, 20Ne, 24Mg, 27Al, 56Fe, 197Au
> 12C + 8Li, 8B, 12C, 27Al, 40Ca
> _at_ 12, 30, 50, 70, 100 MeV/n
>
> But in the case of reaction not from theses systems : 238U+238U for example.
> How does FLUKA simulate the pre equilibrium emission ? Is it an
> extrapolation of fitting functions from theses systems ?
> Thank you so much for clearing me out.
>
> Sincerely,
>
> Trinh, GANIL, France.
> ________________________________________
> De : Francesco Cerutti [Francesco.Cerutti_at_cern.ch]
> Envoyé : lundi 7 mars 2016 09:32
> À : Trinh Ngoc-Duy
> Cc : fluka-discuss_at_fluka.org
> Objet : Re: [fluka-discuss]: Pre-equilibirium emission of low energy heavy
> ion reaction in FLUKA
>
> Dear Trinh,
>
> heavy ion reactions have a specific treatment in FLUKA and at low energies
> are indeed handled by the BME event generator. Below 20 MeV/A you get a
> significant chance for complete fusion, and pre-equilibrium emissions,
> before evaporation/fragmentation/fission, in the present release are
> performed only for systems falling in the domain covered by the
> precomputed database.
>
> On the other hand, for single hadron induced reactions - which are
> another thing -, FLUKA has its own implementation based on the exciton
> model and on the Veselski recipe for pre-equilibrium termination. But this
> does not apply to your case.
>
> Best regards
>
> Francesco Cerutti
>
> **************************************************
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. ++41 22 7678962
> fax ++41 22 7668854
>
> On Fri, 4 Mar 2016, Trinh Ngoc-Duy wrote:
>
> >
> > Dear FLUKA experts,
> >
> >
> >
> > I'm studying the double differential (energy, angle) spectra of particle
> > from heavy ion reaction at low energy beam (<20 MeV/u).
> >
> >
> >
> > I read in this presentation that FLUKA uses the Veselski model to
> calculate
> > the probability of pre-equilibrium emission of particle from reaction
> (page
> > 15).
> >
> >
> >
> > http://pro.ganil-spiral2.eu/events/seminars/files/ceruttiganil.pdf
> >
> >
> >
> > I put the article of this model in attached file.
> >
> >
> >
> > When I’m studying this article, I see that Veselski model is initially
> > developed for nucleus-nucleus reaction at Fermi energy range (20 MeV/A -
> 100
> > MeV/A) and Veselski mentioned the limit of his model for the low energy
> > heavy ion beam (<20 MeV/A).
> >
> >
> >
> > Otherwise, i see that FLUKA uses BME model to simulate the reaction of ion
> <
> > 100 MeV/A and this model is parameterized for the pre-equilibrium
> emission.
> >
> >
> >
> > Hence, i would like to know how FLUKA treats the pre-equilibrium emission
> of
> > particle produced by low energy beam. How Veselski and BME model are used
> in
> > this energy range ?
> >
> >
> >
> > Thank you very much for your answer.
> >
> >
> >
> > Trinh, GANIL, France.
> >
> >___________________________________________________________________________
> _
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> > Preserve our environment, print this email only if necessary.
> >
> >
> >
>
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Received on Mon Mar 07 2016 - 23:17:54 CET