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1、Thegroundstatestructureandalphadecay ofHssuper-heavy isotopesJunqingLi(InstituteofModernPhysics,CAS,Lanzhou)KITPC-CASRelativisticmany-bodyproblemsforheavyandsuperheavynuclei:Jun8-Jun27,2009CollaboratorsMaLong(InstituteofModernPhysics,CAS)HongfeiZhang(LanzhouUniversity)Xiaoho
2、ngZhou(InstituteofModernPhysics,CAS)ZaiguoGan(InstituteofModernPhysics,CAS)超锕新核素259Db及265Bh在核素图上端部分的位置——IMPCAS265Bh0.94s9.24a259Db0.5s9.47aINTRODUCTION--About85super-heavynucleiwithZ=104–118(exceptZ=117)(14)superheavyelementshavebeensynthesizedinexperiments.--Thereisalargega
3、pofunknownisotopesbetweentheneutrondeficitsuperheaviesobtainedincoldfusionandtheheaviestisotopesformedinhotfusion--Thelatterisotopesunderwentthespontaneousfissionbeforereachingknownnuclei.--Hsisotopechainpassesthroughtheregion,andownsadoublemagicdeformednucleus270Hs,andnucle
4、i263,264,265,266,267,269,270,275,277Hsweresynthesized.Spontaneousfission277Hs,278Hs270Hsistheuniquesub-doublemagicSHNproducedsofar.Thestudyofthestructures,decayproperties,andstabilitiesoftheunknownnucleiintheHschain,isusefultogivesomeinformationashowtosynthesizeandtodetectth
5、esenuclei,andatwhichcharacterstheymayconnectwiththedecaychainofupperheaviernuclei.ReactionmechanismtobestudiedII.ThemodelTheeffectiveLagrangianweareusing:Axiallysymmetricdeformationisassumed,thenuclearspinorsandmesonfieldsareexpandedinanaxiallydeformedharmonicoscillatorbasis
6、ThemajorshellischosenforSHNasNf=Nb=20fornucleonsandmesons,respectively.Pairingeffect:BCS.♠TwoimportantpointsforthemicroscopicstudyofthepairinginteractionaretheroleofthefiniterangeandofthedensitydependenceAdensity-dependentdeltainteractionBCScalculationiscarriedoutTheBCS-type
7、pairingwithdensity-dependentdeltafunctioninteraction(DDDI)intherelativisticmeanfieldtheoryBasedonthesingle-particlespectrumcalculatedwiththeRMFmethod,theDDDIisintroduced(850MeVfm3):Foreitherneutronsorprotons,thepairingmatrixelementsmaybewrittenas:H.F.Zhang,J.Q.Lietal.,Euro.P
8、hys.Jour.A30,(2006)519-529preventtheunrealisticpairingofhighlyexcitedstates
