A Simple Systematical Law of E21+ Values for Heavy Nuclei in the NpNn Scheme and the Evolution of the Z=64 Shell Gap
FAN Zhe-Yong1, REN Zhong-Zhou1,2, XU Chang1
1Department of Physics, Nanjing University, Nanjing 2100082Center of Theoretical Nuclear Physics, National Laboratory of Heavy-Ion Accelerator, Lanzhou 730000
A Simple Systematical Law of E21+ Values for Heavy Nuclei in the NpNn Scheme and the Evolution of the Z=64 Shell Gap
FAN Zhe-Yong1;REN Zhong-Zhou1,2;XU Chang1
1Department of Physics, Nanjing University, Nanjing 2100082Center of Theoretical Nuclear Physics, National Laboratory of Heavy-Ion Accelerator, Lanzhou 730000
摘要A systematics of excitation energy of the first 2+ state E21+ in even--even heavy nuclei (A≥120) is studied in the NpNn scheme. It is found that a simple exponential function describes the dependence of E21+ values on NpNn values very well. In addition, the Z=64 shell gap is reexamined by investigating the systematics of the 52≤Z≤66 region. It is found that the Z=64 shell gap is largest at N=82 and becomes smaller with either increasing or decreasing of neutron numbers. The effects of this shell gap become negligible for counting the valence proton numbers when N≥92 or N≤72.
Abstract：A systematics of excitation energy of the first 2+ state E21+ in even--even heavy nuclei (A≥120) is studied in the NpNn scheme. It is found that a simple exponential function describes the dependence of E21+ values on NpNn values very well. In addition, the Z=64 shell gap is reexamined by investigating the systematics of the 52≤Z≤66 region. It is found that the Z=64 shell gap is largest at N=82 and becomes smaller with either increasing or decreasing of neutron numbers. The effects of this shell gap become negligible for counting the valence proton numbers when N≥92 or N≤72.
FAN Zhe-Yong;REN Zhong-Zhou;XU Chang. A Simple Systematical Law of E21+ Values for Heavy Nuclei in the NpNn Scheme and the Evolution of the Z=64 Shell Gap[J]. 中国物理快报, 2007, 24(9): 2555-2558.
FAN Zhe-Yong, REN Zhong-Zhou, XU Chang. A Simple Systematical Law of E21+ Values for Heavy Nuclei in the NpNn Scheme and the Evolution of the Z=64 Shell Gap. Chin. Phys. Lett., 2007, 24(9): 2555-2558.
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2007, Vol. 24 
