Tea Time 学术活动系列邀请报告(144)

报告题目:  Exotic rotations in Ba and Nd nuclei 
报 告 人:  Costel Petrache (Professor, University of Paris-Sud,) 
时    间：12月5日（星期四），13:30-14:30 
地    点：1-401物理学科会议室 
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 motion, which is an unique fingerprint of triaxiality in nuclei and have been intensively studied in recent years. We are currently involved in the study of Lanthanide nuclei. New results have been obtained recently and interpreted as the manifestation of a stable triaxial nuclear shape, presenting various types of collective motion, like tilted axis and principal axis rotation, chiral motion, rotation of nuclei with oblate shape at very high spins. Chiral bands in even-even nuclei, which were taught to be unflavored energetically, unstable against 3D rotation and difficult to observe, have been instead identified very recently in 136Nd. The experimental evidence of such bands will be presented and their theoretical interpretation will be discussed. The experimental evidence of multiple chiral bands in several Lanthanides, as well as the presence of competing collective oblate rotation up to very high spins in Nd nuclei will also be discussed.
报告人简介： 
Costel Petrache 是国际著名实验核物理学家。他于1992在意大利INFN国家实验室获的博士学位，现为巴黎第十一大学（2019年世界大学排名30）终身教授，博士生导师。多年来作为合作组发言人，领导小组分别在芬兰Jyväskylä，意大利INFN, 法国GANIL, 法国ILL, Grenoble, 美国Argonne和南非iThemba等国际一流实验室执行实验。研究领域主要包括原子核手征对称性，远离稳定线的丰质子区核结构，极端条件下的原子核结构、奇异核转动等。他是最早从事于原子核手征对称性实验研究的科学家之一，在该研究方向取得了丰硕的成果，是国际上公认的首屈一指的专家。其次，他在核探测器，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做出重要贡献。他的研究成果，已发表论文超过200篇，其中包括多篇Physical Review Letter和Physics Letter B等，引用次数超过3000次。 另外，他不仅是中国国家自然科学奖评审委员会特邀海外评审专家，而且是国际知名学术期刊《Physical Review C》、《Nuclear Physics A》、《European Physical Journal A》和《Nuclear Instruments and Methods A》等的审稿人。