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
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Received on Mon May 25 2020 - 19:56:52 CEST