--- ******************************************************************* 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 >>>> >>>> ******************************************************************** >>>> >>>> __________________________________________________________________________ >>>> You can manage unsubscription from this mailing list at >>>> https://www.fluka.org/fluka.php?id=acc_info >>>> >> >> __________________________________________________________________________ >> 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 __________________________________________________________________________ You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id=acc_infoReceived on Mon May 25 2020 - 20:03:20 CEST
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