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

• 来源期刊: 中国物理（英文版）
• 关键词: IBM-3 isospin mixed symmetry states 48'50Cr isotopes
• 年，卷（期）: 2004,（8）
• 页码范围: 1230-1238
• 页数: 9页
• 语种: 英文

摘要

The low-energy level structure and electromagnetic transitions of 48'50Cr nuclei have been studied using the interacting boson model with isospin (IBM-3). A sequence of isospin excitation bands with isospin T = Tz, Tz + 1and Tz + 2 has been assigned, and compared with available data. According to this study, the 23+ and 22+ states are the lowest mixed symmetry states in 48Cr and 50Cr, 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.