五种N=82同位素的高自旋结构：136 Ba，137 Cs，138 Ba，139 La和140 Ce
High-spin structures of five N=82 isotones: 136Xe, 137Cs, 138Ba, 139La, and 140Ce
摘要：
在两个聚变-裂变反应中产生了5个N=82的同位素，并用Euroball阵列研究了它们的γ射线。139 La的高自旋态是首次被确认的，而其他四个La的高自旋yraast和near-to-yraast结构也得到了很大的扩展。通过角关联分析，对136 Cs和137 Cs的某些态的自旋值进行了归属。在1800 keV的激发能下，~（139）La γ射线的几个级联被发现是延迟的，它们去激发一个T_（1/2）= 315（35）ns的同质异能态。这五个N=82的同位素的激发态预期是由于涉及位于Z=50壳层闭合之上的三个高j子壳层的各种质子激发。这是证实了在这项工作中进行的壳模型计算的结果。此外，在136 Cs、137 Cs和138 Ba中，与中子核激发相对应的高自旋态已经被明确地识别出来。
英文摘要：
Five N=82 isotones have been produced in two fusion-fission reactions and their gamma-rays studied with the Euroball array. The high-spin states of 139La have been identified for the first time, while the high-spin yrast and near-to-yrast structures of the four others have been greatly extended. From angular correlation analysis,spin values have been assigned to some states of 136Xe and 137Cs. Several cascades involving gamma-rays of 139La have been found to be delayed, they deexcite an isomeric state with T1/2= 315(35) ns located at 1800-keV excitation energy. The excited states of these five N=82 isotones are expected to be due to various proton excitations involving the three high-j subshells located above the Z=50 shell closure. This is confirmed by the results of shell-model calculations performed in this work. In addition, high-spin states corresponding to the excitation of the neutron core have been unambiguously identified in 136Xe, 137Cs, and 138Ba.
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