Title: High-resolution spectroscopy of neutron-rich Br isotopes and signatures for a prolate-to-oblate shape transition at N=56 Show Chinese title

Title: 丰中子溴同位素的高分辨率光谱学及N=56处从长轴到短轴形状转变的迹象

Abstract: The first systematic experimental study of the neutron-rich Br isotopes with two complementary state-of-the-art techniques is presented. These isotopes have been populated in the fission process at two different facilities, GANIL and ILL. New spectroscopic information has been obtained for odd-even $^{87-93}$Br isotopes and the experimental results have been compared with state-of-the-art Large-Scale Shell-Model and DNO Shell-Model calculations. As a result of such theoretical approaches, a transition from prolate ($^{87,89}$Br) to oblate ($^{91,93}$Br) shapes is obtained from the subtle balance between proton and neutron quadrupole deformations, as a clear signature of pseudo-SU3 quadrupole regime. Show Chinese abstract

Abstract: 首次系统地使用两种互补的尖端技术对中子丰盈的溴同位素进行了实验研究。 这些同位素在两个不同的设施，GANIL和ILL，通过裂变过程被生成。新的光谱信息已被获得用于奇偶数的$^{87-93}$溴同位素，并且实验结果与最先进的大规模壳模型和DNO壳模型计算进行了比较。 由于这些理论方法的结果，从质子和中子四极形变之间的微妙平衡中得到了从拉长（$^{87,89}$溴）到扁平（$^{91,93}$溴）形状的转变，这是伪SU3四极区域的一个明显标志。