摘要
系统分析了１４２，１４３，１４４，１４７Ｅｕ中的 ８条超形变带．在对跃迁能量进行光滑化处理，采用ａｂ拟合或改进的ａｂ拟合，确切地指定了其中７条超形变带的自旋值．首次指出了１４７Ｅｕ的１，５两带和２，３两带可能都分别构成旋称伙伴带，且均为 Ｋ＝１／２带，脱耦合常数约为－１．讨论了它们可能的组态结构．
A comprehensive investigation of the superdeformed bands observed in 142,143,144,147Eu was given. The fluctuation in the transition energies has been removed. The smoothed transition energies were fitted by the ab-expression or its modification. The spins of these bands, except for band 4 of 147Eu, have been assigned conclusively. The exit spin in 143Eu was proud to be 29/2, different from that asserted to be determined experi- mentally but remains to be confirmed. The corresponding values in 142Eu and 144Eu(a) are 21 and 28, lower than those proposed in the literature by 6 and 8 units, respectively. Two pairs of superdeformed bands in 147 Eu, i. e. bands 1,5 and bands 2, 3 were proposed to be signature partners. The exit spins are 53/2 and 63/2 for the former pair, and 43/2 and 41/2 for the latter pair. In addition, both of them have a rather large de-coupling constant(≈ - 1 ), implying they are of K = 1/2 and built on the single particle level ν[651 ] ↓ or π[530] ↑. This assignment may be helpful for the studies of the so-called identical bands and pseudospin problem. The signature partner pairs observed in 144,148Eu are not included in the investigation.
出处
《高能物理与核物理》
CSCD
北大核心
2001年第2期121-128,共8页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金!(19677203)资助
关键词
超形变带
原子核转动惯量
自旋指定
铕原子核
superdeformed band, nuclear moments of inertia, spin assignment, ab-expresion and its modification, signature partners
