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: 中子丰富的溴同位素的高分辨率光谱学及N=56处从长椭球到扁椭球形状转变的特征

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: 首次系统地实验研究了中子丰富的溴同位素，采用了两种互补的最先进的技术。这些同位素在两个不同的设施GANIL和ILL的裂变过程中被产生。获得了奇-偶$^{87-93}$溴同位素的新光谱信息，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。通过这种理论方法，从质子和中子四极形变之间的微妙平衡中得到了从长椭球（$^{87,89}$Br）到扁椭球（$^{91,93}$Br）形状的转变，这是伪SU3四极 regime 的明确标志。