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通过对 2 5 2 Cf自发裂变产生的瞬发γ谱的实验研究 ,建立与扩展了丰中子核145 ,147 La的高自旋态能级图 ,最高自旋态达到 ( 4 1 / 2 + )与 ( 4 3/ 2 - ) .测得的交叉相联的相反宇称带及带间的强化E1跃迁说明在 145 ,147 La中形成强的八极形变 .对145 La的研究表明 ,具有轴对称形状的四极形变与具有反演不对称形状的八极形变在同一核中产生共存与竞争 .在πh11/ 2 带中观测到的带交叉位于 ω≈ 0 2 6— 0 30MeV附近 ,由推转壳模型计算表明 ,它是由一对i13/ 2 中子的顺排所引起的
Based on the experimental study of the instantaneous γ spectra of the spontaneous fission of 2 5 2 Cf, the high spin states of the abundance neutron 145, 147 La have been established and extended. The highest spin states reach (4 1/2 +) and (4 3/2 -). The measured cross-correlation of the opposite parity band and the enhanced E1 transition between the bands indicates a strong octupole deformation at 145 and 147 La. Studies of 145 La show that with axisymmetric Coexistence and competition occur in the same core in the shape of quadrupole and in octupole deformation with asymmetric shape of inversion. The bands observed in πh11 / 2 band are located near ω ≈ 0 2 6 0 0 30MeV, The shell model calculations show that it is caused by the alignment of a pair of i13 / 2 neutrons