Re: Re: The FLUKA result is just 10 times lower than analytic one?

From: Yuanjie Bi (biyuanjie@tsinghua.org.cn)
Date: Mon Jun 11 2007 - 09:26:34 CEST

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    Hello Stefan Roesler,

     Thank you for your reply! I have found the mistake made in my analytical result.

     Could you tell me the method to obtain the cross section predicted with FLUKA?

     Many thanks for your help

     = = = = = = = = = = = = = = = = = = = =
                            
    Best regards
     
                                     
    　　　　　　　　Yuanjie Bi
    　　　　　　　　biyuanjie@tsinghua.org.cn
    　　　　　　　　　　2007-06-11

            

    ======= on 2007-06-08 15:04:21 you wrote：=======

    >Hello Yuanjie Bi,
    >
    >I can confirm your FLUKA-result of 2.0406E+11Bq/cm^3. The 7Be production
    >cross section predicted with the most recent FLUKA version is actually
    >15mb.
    >
    >However, I cannot reproduce your analytical result: the saturation yield
    >is 1.002E-7 7Be/primary, the beam intensity is 1.248E15 p/second and the
    >built-up factor is (for tirr=42.72days) 0.4263. The product of the three
    >factors divided by the volume of your region (foil) gives 2.0011E11
    >Bq/cm^3.
    >
    >Regards
    >Stefan
    >
    >On Mon, 4 Jun 2007, Yuanjie BI wrote:
    >
    >> Hi Fluka users,
    >>
    >> I am reserching the radioactivity of a thin carbon foil bombed by 100MeV proton.
    >> The production of Be7 calculated by FLUKA is 2.03E+11Bq/cmc, but my analytic
    >> result using the cross section of 13mb is 1.95E+12Bq/cmc.
    >>
    >> I have checked the input many times and can't find the reason,is my input file
    >> correct ?
    >>
    >> By the way, how could I know the cross section used by FLUKA?
    >>
    >>
    >> Many thanks for your help
    >> Best regards
    >>
    >> Yuanjie Bi
    >> -------------------------------------------------------------------------------
    >> TITLE
    >> C foil bombarded by 100MeV protons
    >> GLOBAL 1.0 1.0
    >> DEFAULTS NEW-DEFA
    >> BEAM -0.1 0.5 0.8 PROTON
    >> BEAMPOS 0.0 0.0 -0.0001
    >> PHYSICS 3.0 EVAPORAT
    >> PHYSICS 1.0 COALESCE
    >> GEOBEGIN COMBNAME
    >> 0 0 C foil inside vacuum
    >> * Black body
    >> RPP blkbody -500.0 500.0 -500.0 500.0 -500.0 500.0
    >> * void
    >> RPP void -100.0 100.0 -100.0 100.0 -10.0 100.0
    >> * target
    >> RPP target -1.0 1.0 -1.0 1.0 0.0 6.66D-05
    >> END
    >> * Black hole
    >> BLKBODY 5 +blkbody -void
    >> * Void around
    >> VOID 5 +void -target
    >> * Target
    >> TARGET 5 +target
    >> END
    >> GEOEND
    >> * ..+....1....+....2....+....3....+....4....+....5....+....6....+....7..
    >> ASSIGNMA BLCKHOLE BLKBODY
    >> ASSIGNMA VACUUM VOID
    >> ASSIGNMA CARBON TARGET
    >> LOW-NEUT 1.0
    >> EMF EMF-OFF
    >> DISCARD ELECTRON POSITRON PHOTON MUON+ MUON- PIZERO
    >> LAM-BIAS 0.0002 CARBON PROTON NEUTRON 7.0INEALL
    >> LOW-BIAS 73.0 72.0 0.85 VOID TARGET 1.0
    >> RADDECAY 1.0 3.0 0.0 99999
    >> IRRPROFI 3691008.0 1.248D+15
    >> DCYTIMES 0.0 28800.0 86400.0 604800.0 2592000.0 10368000.
    >> DCYSCORE 1.0 A A RESNUCLE
    >> RESNUCLE 1.0 -21.0 TARGET 0.000266A
    >> DCYSCORE 2.0 B B RESNUCLE
    >> RESNUCLE 1.0 -22.0 TARGET 0.000266B
    >> RANDOMIZ 1.0
    >> START 1.D8 0.0
    >> STOP
    >>
    >>
    >>
    >
    >--
    >___________________________________
    >
    >Stefan Roesler
    >CERN, SC/RP
    >CH-1211 Geneva 23
    >Switzerland
    >
    >Phone: +41-22-7679891
    >Fax: +41-22-7669639
    >E-mail: Stefan.Roesler@cern.ch
    >

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