報告題目：Chirality, wobbling and oblate rotation

報告人：Costel Marian Petrache 教授

主持人：陳啟博 青年研究員

報告時間：6月30日上午9:30

報告地點：閔行校區(qū)物理樓223會議室

報告人簡介：

Costel Marian Petrache，巴黎-薩克雷大學(xué)終身教授，博士生導(dǎo)師，國際著名實驗核物理學(xué)家。1992年博士畢業(yè)于意大利INFN國家實驗室，曾先后在法國斯特拉斯堡核物理研究中心、意大利INFN國家實驗室、意大利卡梅里諾大學(xué)等任職，2006年起任職于巴黎-薩克雷大學(xué)。研究領(lǐng)域主要包括原子核手征對稱性、極端條件下的原子核結(jié)構(gòu)、奇異核轉(zhuǎn)動等。他是最早開展原子核手征對稱性實驗研究的科學(xué)家之一。作為發(fā)言人，領(lǐng)導(dǎo)合作組在法國GANIL、意大利INFN、芬蘭Jyv?skyl?、南非iThemba等國際一流實驗室開展實驗，取得了豐碩的成果。在核探測器，特別是中子探測器、反沖質(zhì)量譜儀、分段半導(dǎo)體檢測器等實驗設(shè)備研究中也做出重要貢獻(xiàn)。在Physical Review Letter、Physical Review C、Physics Letter B等期刊發(fā)表論文250余篇，引用次數(shù)超過5000次。曾擔(dān)任國家自然科學(xué)獎評審委員會海外評審專家。

報告摘要：

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.