报告题目：Chirality, wobbling and oblate rotation
报告人：Costel Marian Petrache 教授
主持人：陈启博 青年研究员
报告时间：6月30日上午9:30
报告地点：闵行校区物理楼223会议室
报告人简介：
Costel Marian Petrache，巴黎-萨克雷大学终身教授，博士生导师，国际著名实验核物理学家。1992年博士毕业于意大利INFN国家实验室，曾先后在法国斯特拉斯堡核物理研究中心、意大利INFN国家实验室、意大利卡梅里诺大学等任职，2006年起任职于巴黎-萨克雷大学。研究领域主要包括原子核手征对称性、极端条件下的原子核结构、奇异核转动等。他是最早开展原子核手征对称性实验研究的科学家之一。作为发言人，领导合作组在法国GANIL、意大利INFN、芬兰Jyväskylä、南非iThemba等国际一流实验室开展实验，取得了丰硕的成果。在核探测器，特别是中子探测器、反冲质量谱仪、分段半导体检测器等实验设备研究中也做出重要贡献。在Physical Review Letter、Physical Review C、Physics Letter B等期刊发表论文250余篇，引用次数超过5000次。曾担任国家自然科学奖评审委员会海外评审专家。
报告摘要：
The breaking of symmetries in quantum systems is one of the key issues in nuclear physics. In particular, the spontaneous symmetry breaking in rotating nuclei leads to exotic collective modes, like the chiral and wobbling motions, which have been intensively studied in recent years. Chiral bands have been identified at medium spins in 136Nd, and in the neighboring odd-even Cs, Ba, Ce and Nd nuclei. These recent experimental results and their interpretation will be presented. The wobbling motion is also intensively studied in recent years, mainly due to the introduction of the transverse wobbling concept. Latest experimental results on transverse or longitudinal wobbling at low-spin in odd-even nuclei and at medium spin in even-even nuclei will be discussed. Another topic of current interest is the existence of collective oblate shapes and their type of motion. Solid evidence of bands built on oblate shapes close to the ground state in 119Cs, and at very high spin in 137Nd has been recently published. These new experimental results and their interpretation will be discussed.