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推广的液滴模型及其应用简介.ppt

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推广的液滴模型及其应用简介内容采用改进的宏观模型定量描述： 1原子核质量（结合能）与形变 2alpha衰变 3质子放射性 4集团放射性 5自发裂变 6诱发裂变 7各种衰变模型竞争，较好确定原子核寿命 8熔合反应自发裂变与阿尔法衰变的竞争Phys.Rev.Lett.104,142502(2010)Confirmtheodd-eveneffectisveryimportantfordeterminationofthedecaymode.AnexperimentalindicationthatZ=114shellclosurepredictedaroundN=184.二模型简介Theimprovementsweremadefortheconventionalliquiddropmodel(b)Proximityenergy(c)Shellcorrectionenergy(d)Pairingenergy(2)Half-life三模型应用1阿尔法衰变AlphadecayprocessIntheframeworkofcluster-likemode(ZhangandRoyer,PRC77,(2008),054318)Thepenetrationprobability playsthemostimportantrole todeterminethelife-timeof alphadecay.Clearlytheclosedshellstructures playthekeyroleforthepreformation mechanism,andmorethenucleon numberisclosetothemagicnucleon numbers,themorethepreformation ofalphaclusterisdifficultinsidethe mothernucleus.Intheframeworkoffission-likemode(Wang,Zhang,ZuoandLi,CPL27,(2010),062103)AnapproachtodealwiththeassaultfrequencyZhang,RoyerandLi,PRC84(2011)027303Thealphadecayprocessisratheraradioactivityemissionprocessofaclusterpreformedonthesurfaceofthenucleusbutbeforethepotentialpenetration. AlphadecaypropertiesofSHNOneprotonseparationenergiesandalphadecayenergiesof162isotones and184isotones.Potentialenergysurfaceof270Hsand298114byConstrainedRelativisticMeanField theorywiththeparametersNL3Alphadecaylife-timesofHsandZ=114isotopeswithWKBpenetration probability,andthepotentialbarrierisconstructedbytheGLDM.3Clusterradioactivity4自发裂变Comparisonbetweentheoretical(t)andexperimental(e)barriercharacteristicsforactinidenuclei.Ea,EbandEcarethefirst,secondandthirdpeakheightswhileE2andE3aretheenergiesofthesecondandthirdpotentialminimarelativelytothegroundstateenergy(inMeV).Theexternalbarrierdisappearssincetheattractiveproximityforcescannomore compensatefortherepulsiveCoulombforces.Thespontaneousfissionhalf-lifeisverysensitivewiththenucleonnumberofthemothernucleus.Thelogarithmofaveragedeviationsofatotalof47spontaneousfissionnucleiis:Thetrendofthetheoreticalresultsform[11]followstheexperimentaloneswell,but