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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>>
>>
>> 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 - 19:37:49 CEST