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Theoretical Study on Alpha-Decay Chains of 294 117 117 and 293 176 117

Communications in Theoretical Physics 2011年第3期55卷 495-500页

作者： SHENG Zong-Qiang REN Zhong-Zhou School of Physics Nanjing University Nanjing 210093 China Center of Theoretical Nuclear Physics National Laboratory of Heavy-ion Accelerator at Lanzhou Lanzhou 730000China Kavli Institute for Theoretical Physics China Beijing 100190 China

The newly synthesized element 117 and its alpha-decay chains are systematically investigated in the framework of the relativistic mean field theory with parameter sets NL-Z2 and TMA. The ground-state properties of the superheavy nuclei on the alpha-decay chains of 294 117 and 293 117 are calculated. The experimental alpha-decay energies and ha Jr-lives of the two alpha-decay chains are reasonably reproduced by the model The detailed discussions on the binding energies, alpha-decay energies, half-lives, quadrupole deformations, potential energy curves, and single particle levels of the two alpha-decay chains are made.

关键词： superheavy nucleus relativistic mean field theory binding energy alpha-decay energy

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Systematic Study on Alpha Decay Half-Lives of superheavy Nuclei

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Communications in Theoretical Physics 2007年第3X期48卷 545-552页

作者： ZHANG Hong-Fei LI Jun-Qing ZUO Wei ZHOU Xiao-Hong GAN Zai-Guo School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China Institute of Modern Physics the Chinese Academy of Sciences Lanzhou 730000 China Research Center of Nuclear Theory of Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China

The α-decay half-lives of a set of superheavy nuclear isotope chain from Z = 105 to 120 have been analyzed systematically within the WKB method, and some nuclear structure features are found. The decay barriers have been determined in the quasi-molecular shape path within the Generalized Liquid Drop Model （GLDM） including the proximity effects between nucleons in a neck and the mass and charge asymmetry. The results are in reasonable agreement with the published experimental data for the alpha decay half-llves of isotopes of charge 112, 114, and 116, of the element 294118 and of some decay products. A comparison of present calculations with the results by the DDM3Y effective interaction and by the Viola-Seaborg-Sobiczewski （VSS） formulae is also made. The experimental a decay half lives all stand in between the GLDM calculations and VSS formula results. This demonstrates the possibility of these models to provide reasonable estimates for the half-lives of nuclear decays by a emissions for the domain of SHN. The half-lives of these new nuclei are thus well tested from the reasonable consistence of the macroscopic, the microscopic, the empirical formulae and the experimental data. This also shows that the present data of SHN themselves are consistent. It could suggest that the present experimental claims on the existence of new elements Z =110 - 118 are reliable. It is expected that greater deviations of a few SHN between the data and the model may be eliminated by further improvements on the precision of the measurements.

关键词： superheavy nucleus alpha decay life time

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Oblate Superdeformed High-K States in superheavy Nuclei

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Communications in Theoretical Physics 2013年第11期60卷 577-580页

作者：刘红亮 Department of Applied Physics School of Science Xi’an Jiaotong University

Configuration-constrained calculations of potential-energy surfaces for ^292 122 show the occurrence of multiquasiparticle high-K isomeric state at oblate superdeformation. Such state could play a unique role in superheavy nuclei, with possible long life time from enhanced difficulty in fission due to additional barrier at oblate deformation, retardation in a decay due to unpaired nucleons, and hindrance in γ-ray transition due to K forbiddenness.

关键词： oblate deformation superdeformation K isomer superheavy nucleus

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Doubly magic properties in superheavy nuclei

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Chinese Physics C 2009年第S1期33卷 92-94页

作者：黄亚伟朱剑钰 Department of Mathematics and Physics Wenshan Teacher's College School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University

A systematic study of global properties of superheavy nuclei in the framework of the Liquid Drop Model and the Strutinsky shell correction method is performed. The evolution equilibrium deformations, TRS graphs and α-decay energies are calculated using the TRS model. The analysis covers a wide range of even-even superheavy nuclei from Z =102 to 122. Magic numbers and their observable influence occurring in this region have been investigated. Shell closures appear at proton number Z =114 and at neutron number N =184.

关键词： superheavy nucleus magic property TRS model quadrupole deformation β2 α-decay energy

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