Systematic Study on Alpha Decay Half-Lives of Superheavy Nuclei |
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Authors: | ZHANG Hong-Fei LI Jun-Qing ZUO Wei ZHOU Xiao-Hong GAN Zai-Guo |
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Institution: | 1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
;2. Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000, China
;3. Research Center of Nuclear Theory of Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China |
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Abstract: | 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-lives 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 α 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 α 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. |
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Keywords: | superheavy nucleus alpha decay life time |
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