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Systematics on the low-lying spectra in N = 78 ~ 80 isotones

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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S. Q. Zhang

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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X. Q. Li

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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H. Hua

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

Corresponding author.

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C. Xu

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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Z. H. Li

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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P. W. Zhao

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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J. Meng

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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J. J. Sun

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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Z. J. Bai

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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F. R. Xu

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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Y. L. Ye

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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D. X. Jiang

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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E. H. Wang

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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C. He

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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R. Han

School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P. R. China

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X. G. Wu

China Institute of Atomic Energy, Beijing 102413, P. R. China

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G. S. Li

China Institute of Atomic Energy, Beijing 102413, P. R. China

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C. Y. He

China Institute of Atomic Energy, Beijing 102413, P. R. China

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Y. Zheng

China Institute of Atomic Energy, Beijing 102413, P. R. China

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C. B. Li

China Institute of Atomic Energy, Beijing 102413, P. R. China

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S. P. Hu

China Institute of Atomic Energy, Beijing 102413, P. R. China

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S. H. Yao

China Institute of Atomic Energy, Beijing 102413, P. R. China

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B. B. Yu

China Institute of Atomic Energy, Beijing 102413, P. R. China

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X. P. Cao

China Institute of Atomic Energy, Beijing 102413, P. R. China

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, and

J. L. Wang

China Institute of Atomic Energy, Beijing 102413, P. R. China

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https://doi.org/10.1142/S0218301314500372Cited by:0 (Source: Crossref)

Abstract

Combining the new spectroscopy results of ¹⁴⁴Tb and previous spectroscopy studies of neighboring nuclei, a systematic investigation on the low-lying spectra in N = 78 ~ 80 isotones is performed. Good systematics have been found for the coupling patterns which couple the odd nucleon(s), such as πh_11/2, , to the 2⁺, 4⁺, 6⁺ and 3^- core excitations. It is found that the relative excitation energies of the states formed by coupling h_11/2 proton(s) to the 2⁺, 4⁺ core excitations are pushed up, in contrast with those formed by coupling h_11/2 neutron hole(s) to the 2⁺, 4⁺ core excitations, which are pulled down. According to the systematics, the interpretation that the 17/2⁺ states observed in ¹⁴¹Sm and ¹⁴³Gd are the fully aligned member of coupling the odd h_11/2 neutron hole to the octupole 3^- core excitation, is explored to the isotones ¹⁴⁵Dy, ¹⁴²Eu, and ¹⁴⁴Tb.

Keywords:

PACS: 21.10.Re, 23.20.Lv, 27.60.+j

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