采用熱熔合方法合成超重核的理論研究課件

采用熱熔合方法合成超重核的理論研究

王楠

深圳大學(xué)

蘭州2012年8月10日

合作者:趙恩廣(中科院理論物理所)

周善貴(中科院理論物理所)

李君清(中科院近代物理所)W.Scheid(GiessenUniversity,Giessen)1Giessen采用熱熔合方法合成超重核的理論研究王楠蘭州合作OutlineIntroductionTheoreticalModelsResultsanddiscussionsSummary2GiessenOutlineIntroduction2GiessenSuper-heavyelementsuptoZ=118havebeensynthesizedexperimentally.Z=107-113:coldfusion,208Pb/209Bibasedreactionsbyevaporating1or2neutrons(Rev.Mod.Phys.72(2000)733,Rep.Prog.Phys.61(1998)639)

Z=112-118:48Cainducedfusionreactions,48Cabombardingactinidetargetsbyevaporating3-5neutrons(J.Phys.G34(2007)R165,NPA787(2007)343c,PRC83,054315(2011))IMPinLanzhou:259Db,265Bh,271DsExperimentalachievements3GiessenZ=107-113:coldfusion,208Pb/TheoreticalmodelsforSHNproductionMacroscopicdynamicalmodel

S.BjornholmandW.J.SwiateckiFusionbydiffusionmodelY.Abe,Y.Aritomo,Z.H.Liu,J.D.Bao,C.W.Shen,K.Siwek-Wilczynskaetal

NucleoncollectivizationmodelV.I.ZagrebaevDinuclearsystemmodel

V.VVolkov,G.G.Adamian,N.V.Antonenko,A.K.Nasirov,W.Scheid,etalJ.Q.Li,E.G.Zhao,S.G.Zhou,Z.Q.Feng,M.H.Huang,NanWangetalOthermodelNingWang4GiessenTheoreticalmodelsforSHNproEvaporationresiduecrosssection:TPENCNCFcapturefusionevaporationSchematicpictureoftheformationofSHN5GiessenEvaporationresiduecrosssectCaptureoftwocollidingnucleiTransmissionprobabilitycalculatedfrombarrierdistribution:Thevalueof1is2-4MeVlessthantheoneof2V.I.Zagrebaev,Phys.Rev.C64(2001)0346066GiessenCaptureoftwocollidingnucleTheformationofcompoundnucleiisthefusionalongthemassasymmetrydegreeoffreedom.Dinuclearsystemconcept(fromtheinvestigationofdeepinelasticcollisions)Di-nuclearsystemconceptV.V.Volkov,Phys.Rep.44(1978)937GiessenTheformationofcompoundnucFormationofcompoundnucleus-MasterequationHamiltonian8GiessenFormationofcompoundnucleusLi,Wang，Lietal.,J.Phys.G32(2006)1143developmentofdynamicaldeformationG.Wolschin,Phys.Lett.B88(1979)35EffectsofnuclearstaticdeformationanddynamicaldeformationC.Riedel,G.Wolschin,andW.Noerenberg,Z.Phys.A290,47(1979).9GiessenLi,Wang，Lietal.,J.Phys.GPotentialenergysurfaceExcitationenergyofDNSPotentialEnergySurface(PES)IntrinsicenergyG.Wolschin,Phys.Lett.B88(1979)35C.Riedel,G.Wolschin,andW.Noerenberg,Z.Phys.A290,47(1979).V.I.Zagrebaev,Phys.Rev.C64(2001)034606Deformationdependent10GiessenPotentialenergysurfaceExcitaDrivingpotentialIntrinsicenergyandPESfor50Ti+249CfNanWang,En-guangZhao,WernerScheidandShan-guiZhou,Phys.Rev.C85(2012)041601(R)11GiessenDrivingpotentialIntrinsiceneDrivingpotential12GiessenDrivingpotential12GiessenThethermalcompoundnucleuswilldecaybyevaporating-ray,

lightparticlesandfission.ThesurvivalprobabilitiescanbewrittenasSurvivalprobabilityofexcitedcompoundnucleus13GiessenThethermalcompoundnucleuswResultsanddiscussionsCapturecrosssectionsfor48Ca+238U,237Np,242Pu,244Pu,243Am,248Cm,249Bk,249CfExp.W.Q.Shenetal,PRC88(1979)35M.G.Itkis,etal,ProceedingsofInternationalWorkshoponFusionDynamicsattheExtremes,Dubna,Russia,2000,(2001).14GiessenResultsanddiscussionsCapturePotentialenergysurfaceandPcnfor48Ca+238U,48Ca+248Cm15GiessenPotentialenergysurfaceandPFusionprobabilitiesforsomehotfusionreactions16GiessenFusionprobabilitiesforsomeSurvivalprobabilitiesforsomecompoundnucleiproducedinhotfusionreactions17GiessenSurvivalprobabilitiesforsomExcitationfunctionsfor48Ca+238U,237NpExp.Yu.Ts.Oganessian,etal.,PRC70(2004)06460918GiessenExcitationfunctionsfor48Ca+Evaporationresiduecrosssectionsfor48Ca+242,244PuExp.Yu.Ts.Oganessianetal.,PRC70(2004)064609P.A.Ellison,etal,PRL105(2010)18270119GiessenEvaporationresiduecrosssectEvaporationresiduecrosssectionsfor48Ca+243Am,248CmExp.Yu.Ts.Oganessianetal.,PRC69(2004)021601(R),PRC70(2004)064609S.Hofmann,S.Heinz,R.Mann,etal.,Euro.Phys.J.A48,(2012)120GiessenEvaporationresiduecrosssectEvaporationresiduecrosssectionsfor48Ca+249Bk,249CfExp.Yu.Ts.Oganessianetal.,PRC74.044602(2006)PRC83,054315(2011)21GiessenEvaporationresiduecrosssectEvaporationresiduecrosssectionsfortheSHN112-12022GiessenEvaporationresiduecrosssectExperimentaboutsynthesisofelements120C.E.Dullmann,“NewsfromTASCA”,talkgivenatthe10thWorkshoponRecoilSeparatorforSuperheavyElementChemistry,October14,2011,GSIDarmstadt,Germany(unpublished)

Yu.Ts.Oganessian,etal.,PRC79(2009)02460350Ti+249Cf58Fe+244Pu23GiessenExperimentaboutsynthesisofTheoreticalinvestigationsoftheproductionofSHN119and120A.K.Nasirovetal.PRC79(2009)024606NingWang,J.L.Tian,W.ScheidPRC84(2011)061601(R)V.Zagrebaev,W.GreinerPRC78(2008)034610DNSModelFBDmodelOthermodelA.K.Nasirovetal.PRC84(2011)044612G.G.Adamian,G.A.Antonenko,W.Scheid.EJPA41(2009)235K.Siwek-Wilczynska,T.Cap,M.Kowal,A.Sobiczewski,andJ.Wilczynski,

PRC78(2008)034610Z.H.Liu,J.D.Bao.PRC84(2011)031602(R)Z.-G.Gan,etal,Sci.China-Phys.Mech.Astron.54(Suppl.1),s61(2011)24GiessenTheoreticalinvestigationsof25Giessen25GiessenExcitationfunctionsforproducingnucleiZ=120FusionprobabilitiesasafunctionofexcitationenergyforproducingnucleiZ=120E*(MeV)26GiessenExcitationfunctionsforprodFusionprobabilitiesfor50Ti+249Bk,54Cr+243Amand58Fe+237NpreactionsleadingtonucleiwithZ=119Evp.Crosssectionsfor50Ti+249Bk,54Cr+243Amand58Fe+237NpreactionsleadingtonucleiwithZ=119E*(MeV)27GiessenFusionprobabilitiesforEvpExcitationfunctionsforsomeTi+Bk,Cfis