Generalization of α-Decay Cluster-Model to Nuclei Near Spherical and Deformed Shell Closures |
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作者姓名: | XUChang RENZhong-Zhou |
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作者单位: | [1]DepartmentofPhysics,NanjingUniversity,Nanjing210008,China [2]CenterofTheoreticalNuclearPhysics,NationalLaboratoryofHeavy-IonAccelerator,Lanzhou730000,China |
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摘 要: | The cluster model of a-decay is extended to the regions around doubly magic spherical nucleus ^208Pb and around deformed shell closure ^270Hs, respectively. The effects of spherical shell closures (N=126 and Z=82) on α-decay are investigated by introducing an N-dependent α-preformation factor and a Z-dependent one inspired by a microscopic model. Good agreement between the theoretical a-decay half-lives and the measured ones is obtained for the spherical nuclei near the doubly magic nucleus ^208Pb, where the nuclear shell effect is included in the expression of α-preformation factor. The cluster model is also generalized for the decay of deformed nuclei. The branching ratios of α-decays from the ground state of a parent nucleus to the ground state (0^ ) of its deformed daughter nucleus and to the first excited state (2^ ) are calculated in the framework of the cluster model. The results indicate that a measurement of α spectroscopy is a feasible method to extract the information of nuclear deformation of superheavy nuclei around the deformed nucleus ^270Hs.
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关 键 词: | 阿尔法衰退 变形 两制轨道效应 原子干扰 重核子 |
收稿时间: | 2004-02-25 |
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