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