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1、第30卷第8期高能物理与核物理Vol.30,No.82006年8月HIGHENERGYPHYSICSANDNUCLEARPHYSICSAug.,2006OctupoleDeformedBandandQuasi-°Bandin146CeNucleus*1;1)1222CHENYong-JingZHUSheng-JiangJ.H.HamiltonA.V.RamayyaJ.K.Hwang23111Y.X.LuoJ.O.RasmussenCHEXin-LaiDINGHuai-BoLIMing-Liang1(DepartmentofPhysics,TsinghuaUniversity,
2、Beijing100084,China)2(DepartmentofPhysics,VanderbiltUniversity,Nashville,Tennessee37235USA)3(LawrenceBerkeleyNationalLaboratory,Berkeley,California94720USA)146AbstractHigh-spinstructuresinCenucleushavebeenre-investigatedbymeasuringtheprompt°rays252146fromspontaneous¯ssionofCf.Thepreviouslyr
3、eportedlevelschemeofCehasbeenupdated.Theoctupoledeformedcollectivebandshavebeenextendeduptohigherspinstates.Apossiblequasi-°bandstructurewasexaminedandreconstructedaccordingtoourdataanalysis.Inaddition,there°ectionasymmetric146shellmodelwasappliedtodescribetheoctupoledeformedbandsinCe,andth
4、ecalculatedresultsareingoodagreementwiththeexperimentaldataatlowerspins.Keywordshighspinstate,octupoledeformedband,quasi-°band,shellmodelThenucleiinA=140neutron-richregionhaveemittedbythe¯ssionfragments,andextendedthe¡¡beenstudiedveryextensivelyinrecentyears.Thesehigh-spinstatesupto11and15,
5、respectively.In[8]146neutron-richnucleihaveattractedcontinuingatten-anearlierpaper,thequasi-°bandstructureofCetion,sincetheycanprovideanopportunitytostudyhasbeensuggested,butthemembersofthequasi-°thetransitionfromthesphericalstructurenearthebandwerenotclearlydeterminedbecausethespinsN=82clo
6、sedtothedeformedregionbeyondN=89.ofthoselevelswerenotexperimentallyassigned.In146[9]TheCenucleuswithN=88,Z=58islocatedatpublication,apossiblequasi-°bandhasbeenes-theonsetofoctupoledeformationofthemass140tablishedanddiscussedthrough°-°angularcorrela-[1
7、3]region,andadetailedstudyofthelevelstr
8、uc-tionmeasurement.Inthispaper,were-investigate146turesofthisnucleuscanprovideimportantinforma-thehighspinstatesofCefromtheprompt°-ray252tiononthenuclearshapechangesandtheoctupolestudiesinspontaneous¯ssionofCfandreporton[4]correlationsinthisregion.thenew
