1、蘭州大學(xué)碩士學(xué)位論文GTAF探測器屏蔽體系統(tǒng)的MCNP模擬計(jì)算設(shè)計(jì)姓名：王強(qiáng)申請學(xué)位級別：碩士專業(yè)：粒子物理與原子核物理指導(dǎo)教師：劉正民周祖英20070501蘭州大學(xué)碩士學(xué)位論文AbstractInordertoget(n，Y)accuratereactioncapturecrosssectionChinaInstituteofAtomicEnergy(CIAE)GTAF(gammaraytotalabsorptionfacility)

2、grouparedevelopingadetectingsetof4AfullabsorptionThispaperwhichmakesuseofMCNPprocedureandbaseson訊晦detectortakesanalogcomputationdesignworktotheGTAFshieldbodysystemFirstly，wedesignedtheneutronsourceshieldbodyandthecollimu

3、tor，throughsimulationintheBaFzdetectorsystemItisanimportantfigureofneutronsource’sperformance，whiletheneutronsourceshieldbedyandneutronstreamcollinatorprovideaperfectexperimentbackgroundandneutronstreamrespectivelyinthis

4、neutroncapturecrossreaction。Secondly，wetooksimulationanddesignationtotheneutronabsorberTheneutronabsorberwhichistheplaceofneutroncapturereactionisinthesphereshellScientificsimulationanddesignationisimportanttoneutronabso

5、rptionfilter，inordertogetthecorrectYsignalwhichcomefromB出crystaldetector。makeitabsorbscatterneutroII，recedeYbackground。andreducetheexcursionofYspectrumFinally，wedesignedtheneutronacquirerthroughsimulationthedesignofneutr

6、onacquirerisimportant，itcanreducescatterneutronwhichinsample、BaFzcrystalandonedge，alsoincludeextraphotonofbackground，soitmustbemoreexactlyWetake腳programinsimulationanddesignationMCNPprogramisalargemulti—functionparticleM

7、onteCarlotransportprogram，itcancomputeneutron、electron、photontransportandcouplingtransportbetweenthem，IthassuperiorityinradiationshieldofnuclearphysicsandrelativedesignofneutronphotontransportFinallywedesignedthe6TAFdete

8、ctorshieldbedywhichincludeneutronsourcecollinator，neutronabsorberinsampleandneutronacquirerAftersimulationalltheperformancesgetintotheanticipateddesigningeffectsAllthesimulationsanddesignationsworkwillprovidewellconditio