Nuclear Physics A ( IF 1.7 ) Pub Date : 2021-05-26 , DOI: 10.1016/j.nuclphysa.2021.122225 T.X. Li , C.B. Li , Y. Zheng , X.G. Wu , J. Zhong , B.J. Zhu , Q.W. Fan , Y.X. Gao , Y.J. Jin , G.S. Li , L.H. Zhu
The lifetimes of several negative-parity states in 134Ce excited via the reaction 122Sn(16O, 4n)134Ce at an incident beam energy of 76 MeV were measured for the first time by means of the recoil-distance Doppler-shift technique. The small transition strengths deduced from the lifetime data at the bottom of the negative-parity yrast states show spherical shape, in qualitative accordance with predictions of the shell model. At higher excitation energy along the negative-parity yrast line, the experimental transition strengths indicate an apparent gain of collectivity with increasing spin. The quadrupole deformation derived from the values at the bottom of the negative-parity yrast band confirms the predictions of the cranked Nilsson-Strutinsky Bogoliubov calculations. The systematic evolution in structure of the negative yrast states in Ce isotopes and isotones is discussed.
中文翻译:
寿命测量和134 Ce中一些负奇偶态的结构
首次通过反冲距离多普勒频移测量了入射束能量为 76 MeV 的134 Ce反应激发的134 Ce中几种负奇偶态的寿命122 Sn( 16 O, 4 n ) 134 Ce技术。小根据壳模型的预测定性地,从负奇偶性 yrast 状态底部的寿命数据推导出的过渡强度显示球形。在沿负平价 yrast 线的更高激发能量下,实验过渡强度表明,随着自旋的增加,集体性明显增加。四极变形由负奇偶校验带底部的值证实了曲柄 Nilsson-Strutinsky Bogoliubov 计算的预测。Ce 同位素中负 yrast 态结构的系统演化和 讨论了同位素。