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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 |
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| Cite this article: |
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FAN Zhe-Yong, REN Zhong-Zhou, XU Chang 2007 Chin. Phys. Lett. 24 2555-2558 |
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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.
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| Keywords:
27.60.+j
27.70.+q
27.80.+w
27.90.+b
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Received: 15 May 2007
Published: 16 August 2007
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