报告题目：激光核谱探测方法的创新与发展
报告人：岳子宣 博士（约克大学）
报告时间：9月11日15:00
报告地点：理8栋学术报告厅118
摘要：
Laser spectroscopy is one of the most powerful tools for studying ground and isomeric state nuclear properties. By observing small changes in atomic transitions, we can deduce the nuclear spin, electromagnetic moments, and changes in mean-square charge radii across long chains of isotopes. This allows us to study how the shapes of the nuclei evolve along the isotopic chain and hence to validate different types of nuclear theories.
There are two main techniques in laser spectroscopy setups worldwide. Collinear laser spectroscopy provides exceptionally high resolution, which allows access to electric quadrupole moments, but inevitably, with a significant loss of efficiency. The second approach is the in-source laser method, which has lower resolution but orders of magnitude higher efficiency. With the combination of both highly sensitive radiation detection systems, such as a decay station with various particle detectors, and mass spectrometry devices like MR-ToF, it is possible to study exotic isotopes with extremely low production rates using the in-source method. Over the past decade, an extensive campaign has been conducted at ISOLDE, CERN, studying the structure of the isotopes around the lead region. Results of recent analysis of bismuth and thallium data will be presented, along with the theoretical studies on the shell effects when crossing the Z=82 closure. The prospects for future in-source studies in this region will be illustrated.
报告人简介：
岳子宣，博士毕业于英国约克大学，课题是运用衰变探测的方法测量丰中子铊的激光核谱，并研究其在壳N=126附近的结构，博士期间有两年半的时间在ISOLDE衰变站作为local contact，期间主导了所有在衰变站运行实验的搭建和线上的数据分析。在此之余，还深度参与了很多在ISOLDE其他装置的实验，比如在数伽马谱（MINIBALL），共线激光核谱（北京大学合作参与）等其他实验。除了在ISOLDE之外，岳子宣还在美国阿贡实验室的AGFA（充气磁铁分离装置）上参加了相关实验（189,190At, heaviest proton emitter）。