中国物理B ›› 2004, Vol. 13 ›› Issue (8): 1230-1238.doi: 10.1088/1009-1963/13/8/009

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Isospin and F-spin symmetry structure in low-lying levels of 48，50Cr isotopes

法列1, 龙桂鲁2   

  1. (1)Department of Physics, Tsinghua University, Beijing 100084, China; Key Laboratory for Quantum Information and Measurements, MOE 100084, China; (2)Department of Physics, Tsinghua University, Beijing 100084, China; Key Laboratory for Quantum Information and Measurements, MOE 100084, China; Centre of Nuclear Theory, Lanzhou Heavy Ion Accelerator National Laboratory, Lanzhou 730000, China; Institute of
  • 收稿日期:2003-10-16 修回日期:2004-04-03 出版日期:2004-06-21 发布日期:2005-06-21
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10047001, 10325521), the Major State Basic Research Development Programme (Grant No G200077400) and the SRFDP programme of Education Ministry of China.

Isospin and F-spin symmetry structure in low-lying levels of 48,50Cr isotopes

Falih H. Al-Khudair (法列)ab, Long Gui-Lu (龙桂鲁)abcd   

  1. a Department of Physics, Tsinghua University, Beijing 100084, Chinab Key Laboratory for Quantum Information and Measurements, MOE 100084, China; c  Centre of Nuclear Theory, Lanzhou Heavy Ion Accelerator National Laboratory, Lanzhou 730000, Chinad Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2003-10-16 Revised:2004-04-03 Online:2004-06-21 Published:2005-06-21
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10047001, 10325521), the Major State Basic Research Development Programme (Grant No G200077400) and the SRFDP programme of Education Ministry of China.

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摘要： The low-energy level structure and electromagnetic transitions of {}^{48,50}Cr nuclei have been studied using the interacting boson model with isospin (IBM-3). A sequence of isospin excitation bands with isospin T=T_z, T_z+1 and T_z+2 has been assigned, and compared with available data. According to this study, the 2^+_3 and 2^+_2 states are the lowest mixed symmetry states in {}^{48}Cr and {}^{50}Cr, respectively. In particular, the present calculations suggest that a combination of isospin and F-spin excitation can explain the structure in these nuclei. The transition probabilities between the levels are analysed in terms of isoscalar and isovector decompositions which reveal the detailed nature of the energy levels. The results obtained are in good agreement with recent experimental data.

关键词: IBM-3, isospin, mixed symmetry states, {}^{48, 50}Cr isotopes

Abstract: The low-energy level structure and electromagnetic transitions of $^{48,50}$Cr nuclei have been studied using the interacting boson model with isospin (IBM-3). A sequence of isospin excitation bands with isospin $T=T_z$, $T_z+1$ and $T_z+2$ has been assigned, and compared with available data. According to this study, the $2^+_3$ and $2^+_2$ states are the lowest mixed symmetry states in $^{48}$Cr and $^{50}$Cr, respectively. In particular, the present calculations suggest that a combination of isospin and F-spin excitation can explain the structure in these nuclei. The transition probabilities between the levels are analysed in terms of isoscalar and isovector decompositions which reveal the detailed nature of the energy levels. The results obtained are in good agreement with recent experimental data.

Key words: IBM-3, isospin, mixed symmetry states, $^{48,50}$Cr isotopes

中图分类号:  (Spin, parity, and isobaric spin)

  • 21.10.Hw
21.10.Ma (Level density) 23.20.Lv (γ-transitions and level energies) 21.60.Ev (Collective models) 11.30.Pb (Supersymmetry) 27.40.+z (39 ≤ A ≤ 58)