Dear Paola
Thank you very much.
Regards,
Jilberto
*******************************************************************
Dr. Jilberto Zamora Saa
Facultad de Ciencias Exactas
Universidad Andrés Bello
Santiago, Región Metropolitana, Chile
phone: +(56) 22 770 3707 (Office)
email: jzamorasaa_at_jinr.ru
********************************************************************
El 26 de may. de 2020 2:06 AM -0400, Paola Sala <paola.sala_at_mi.infn.it>, escribió:
> Hello
> answers below
> > Dear Paola
> >
> > Thanks you for your answer, now the situation is more clear to me.
> >
> >
> > It seems that I must add two cards:
> >
> > 1) photonuclear
> > 2) electronuclear
> yes
>
> >
> > I suppose that both (photo-nuclear and electro-nuclear) cards need a
> > LAM-BIAS card, then how I should add the two LAM-BIAS cards, each one
> > after the corresponding PHOTOBUC card?
> Yes. You do not need to add them after the corresponding photonuc, they
> can be anywhere.
>
> >
> > thank in advance,
> > Jilberto
> >
> > ---
> > *******************************************************************
> > Dr. Jilberto Zamora Saa
> > Dzhelepov Laboratory of Nuclear Problems
> > Joint Institute for Nuclear Research
> > 141980 Dubna, Moscow region, Russia
> > phone: +(496)2162589 (Office)
> > phone: +7(915)4671294 (Mobile)
> > email: jzamorasaa_at_jinr.ru
> >
> > ********************************************************************
> >
> > El 25-05-2020 12:08 pm, Paola Sala escribió:
> > > Hello
> > > The electronuclear cross section is suppressed by a factor 1/alpha
> > > (1/137)
> > > with respect to the photonuclear one (electronuc goes throug virtual
> > > photon)
> > > Thus, electronuclear dominate in the very first part of the shower, up
> > > to
> > > ~0.25radiation lengths. Afterwards, the photons produced in the shower
> > > dominate.
> > > Paola
> > > > hello
> > > >
> > > > It seems to me because my beam is composed by electrons I should pay
> > > > more attention to electro-nuclear interaction than photo-nuclear
> > > > interaction (is this correct?), that is why I defined the PHOTONUC
> > > > card,
> > > > using SDUM=ELECTNUC.
> > > >
> > > > cheers,
> > > > Jilberto
> > > >
> > > > ---
> > > > *******************************************************************
> > > > Dr. Jilberto Zamora Saa
> > > > Dzhelepov Laboratory of Nuclear Problems
> > > > Joint Institute for Nuclear Research
> > > > 141980 Dubna, Moscow region, Russia
> > > > phone: +(496)2162589 (Office)
> > > > phone: +7(915)4671294 (Mobile)
> > > > email: jzamorasaa_at_jinr.ru
> > > >
> > > > ********************************************************************
> > > >
> > > > El 25-05-2020 4:22 am, Answers escribió:
> > > > > Hello
> > > > > the LAM-BIAS card should have no SDUM. One has to bias the
> > > > > interaction
> > > > > probability, not the decay probability.
> > > > > The PHOTONUC card with SDUM=ELECTNUC activates nuclear reactions
> > > > > induced by electrons. In order to activate nuclear reactions induced
> > > > > by photons, a PHOTONUC card with a blank SDUM is needed
> > > > > Regards
> > > > >
> > > > >
> > > > >
> > > > > On Sat, 23 May 2020, Jilberto Antonio Zamora Saá wrote:
> > > > >
> > > > > > Dear fluka expert
> > > > > >
> > > > > > I'm simulating 100 GeV electron beam impinging a Pb target. I'm
> > > > > > interested in score neutron and energy deposited in a calorimeter
> > > > > > place after the target. In order to have good accuracy, I have
> > > > > > defined
> > > > > > the corresponding PHOTONUC card, using SDUM=ELECTNUC option. Then,
> > > > > > as
> > > > > > is recommended in the fluka manual I have added a LAM-BIAS card with
> > > > > > SDUM=GDECAY.
> > > > > >
> > > > > >
> > > > > >
> > > > > > The manual reads:
> > > > > >
> > > > > > "10) For photons, a typical reduction factor of the hadronic
> > > > > > inelastic
> > > > > > interaction length is the order of 0.01-0.05 for a shower
> > > > > > initiated
> > > > > > by 1 GeV photons or electrons, and of 0.1-0.5 for one at
> > > > > > 10
> > > > > > TeV.
> > > > > > For electrons and positrons, a typical reduction factor
> > > > > > is
> > > > > > about
> > > > > > 5.E-4"
> > > > > >
> > > > > >
> > > > > > According to the fluka manual, I have tried different values of
> > > > > > parameter lambda-inelastic (WHAT(2)), starting from 5.E-4 as the
> > > > > > manual suggests to my case. However, it was impossible to run the
> > > > > > code, this takes a lot of time and then the computer becomes stuck.
> > > > > > In
> > > > > > this sense, I start to increase this value, founding that for a
> > > > > > value
> > > > > > equal to 0.6 the code works.
> > > > > >
> > > > > > So. I would like to ask if there is any problem choosing a value
> > > > > > different from the recommended and how this fact can affect my
> > > > > > results?
> > > > > >
> > > > > > thank you in advance.
> > > > > >
> > > > > > regards,
> > > > > > Jilberto
> > > > > >
> > > > > > --
> > > > > > *******************************************************************
> > > > > > Dr. Jilberto Zamora Saa
> > > > > > Dzhelepov Laboratory of Nuclear Problems
> > > > > > Joint Institute for Nuclear Research
> > > > > > 141980 Dubna, Moscow region, Russia
> > > > > > phone: +(496)2162589 (Office)
> > > > > > phone: +7(915)4671294 (Mobile)
> > > > > > email: jzamorasaa_at_jinr.ru
> > > > > >
> > > > > > ********************************************************************
> > > > > >
> > > > > > __________________________________________________________________________
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> > > > > >
> > > >
> > > > __________________________________________________________________________
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> > > > https://www.fluka.org/fluka.php?id=acc_info
> > > >
> > >
> > >
> > > Paola Sala
> > > INFN Milano
> > > tel. Milano +39-0250317374
> > > tel. CERN +41-227679148
> >
> > __________________________________________________________________________
> > You can manage unsubscription from this mailing list at
> > https://www.fluka.org/fluka.php?id=acc_info
> >
>
>
> Paola Sala
> INFN Milano
> tel. Milano +39-0250317374
> tel. CERN +41-227679148
>
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Received on Tue May 26 2020 - 19:54:54 CEST