Re: [fluka-discuss]: Question about PHOTONUC and LAM-BIAS cards.

From: Jilberto Antonio Zamora Saá <jzamorasaa_at_jinr.ru>
Date: Mon, 25 May 2020 12:45:55 -0400

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

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?

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
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Received on Mon May 25 2020 - 20:03:20 CEST

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