报告题目：Francium and Fundamental Symmetries

报 告 人：Luis A. Orozco, University of Maryland and NIST

报告时间：2024年7月2日上午10点

报告地点：理科楼C302

报告摘要：Francium, discovered eighty-five years ago by Margarite Perey, is the heaviest alkaline atom. It is the most unstable element of the first 103 on the periodic table, and its longest halflived isotope lasts 20 minutes. At any given time, there are only a few grams distributed throughout the earth because it is the product of the decay of uranium and thorium. In-line laser trapping and cooling with an accelerator has made it available for precision spectroscopy. With my students and collaborators, we have dedicated thirty years to its spectroscopic study because its atomic and nuclear structure makes it an ideal laboratory to study the weak interaction. I will present our proposal to better understand the weak interaction at low energy, preliminary measurements of the forbidden M1 transition between states 7S to 8S, and progress towards weak interaction studies (parity violation, time violation) at TRIUMF, the Canadian subatomic physics laboratory in Vancouver.

报告人简介：Luis Adolfo Orozco was born in Guadalajara, Mexico in 1958. He completed his engineering studies at the Instituto Tecnológico y de Estudios Superiores de Occidente in Guadalajara, Mexico and his postgraduate studies in physics at the University of Texas at Austin, obtaining his doctorate in 1987. He held a postdoctoral position at Harvard, passing part of this one at CERN, Switzerland. He returned to the United States and worked from 1991 to 2003 as a professor in the physics department of the State University of New York at Stony Brook. From 2003 to 2020 he was professor of physics at the University of Maryland in College Park, MD, USA, where he co-directed the Physics Frontier Center of the Joint Quantum Institute com 2008 to 2019. Since 2021 he is Emeritus Professor. Throughout his career Dr. Orozco has been Guggenheim Fellow (1998), Fellow of the American Physical Society (2000) Fellow of the Optical Society of America (2003), Fellow of the Institute of Physics, UK (2005), Distinguished Traveling Lecturer of the American Physical Society (2002-2025) and corresponding member of the Academia Mexicana de Ciencias since (2005). He has an Honoris Causa Doctorate from INAOE, Mexico (2016). He has graduated 23 PhD students (3 from Mexico) and more than 60 undergraduates (35 from Mexico) have worked in his group. Together with his students and collaborators he is author of more than 100 publications. As a researcher, he is interested in quantum optics, quantum information, fundamental symmetry tests, and high precision spectroscopy. Among his most recognized studies are the trapping and spectroscopy of Francium for weak – interaction studies and the field intensity correlations in quantum optics. http://www.physics.umd.edu/rgroups/amo/orozco/index.html