报告人：Klaus Blaum

时间：2023年11月22日 周三 15:00 - 16:00

地点：理科楼5号楼300号

摘要：

The four fundamental interactions and their symmetries, the fundamental constants as well as the properties of elementary particles like masses and moments, determine the basic structure of the universe and are the basis for our so well tested Standard Model (SM) of physics. Performing stringent tests on these interactions and symmetries in extreme conditions at lowest energies and with highest precision by comparing e.g. the properties of particles and their counterpart, the antiparticles, will allow us to search for physics beyond the SM. Any improvement of these tests beyond their present limits requires novel experimental techniques.

An overview is given on recent mass and g-factor measurements with extreme precision on single or few cooled ions stored in Penning traps. On the one hand, mass measurements provide crucial information for atomic, nuclear and neutrino physics as well as for testing fundamental interactions and their symmetries and fifth force search. On the other hand, g-factor measurements of the bound electron in highly charged hydrogen-like ions allow for the determination of fundamental constants and for constraining Quantum Electrodynamics. For example, the most stringent test of CPT symmetry in the baryonic sector could be performed by mass comparison of the antiproton with the H^- ion and the knowledge of the electron atomic mass could be improved by a factor of 13. Our latest results on precision measurements with exotic ions in Penning traps will be presented.

报告人简介：

Klaus Blaum studied physics at the Johannes Gutenberg University Mainz. After completing his doctorate in Mainz, he moved to the European Nuclear Research Centre CERN in Geneva as a postdoctoral researcher at the GSI Helmholtz Centre for Heavy Ion Research Darmstadt. From 2004 to 2007, he headed a Helmholtz research group in Mainz, where he habilitated in 2006. In 2007, at the age of only 35, he was appointed director of the department "Stored and Cooled Ions" at the Max Planck Institute for Nuclear Physics in Heidelberg. At the same time, he is a professor and member of the Faculty of Physics and Astronomy at the Ruprecht Karls University in Heidelberg.

Klaus Blaum has received a number of prizes for his groundbreaking work, including the Gustav Hertz Prize 2004 of the German Physical Society, the Mattauch Herzog Prize 2005 of the German Society for Mass Spectrometry, the Helmholtz Prize for Precision Measurement in 2012, the G.N. Flerov Prize in 2013, the Lise Meitner Prize for Nuclear Physics of the European Physical Society in 2020, and the Otto Hahn Prize of the City of Frankfurt am Main, the German Chemical Society and the German Physical Society in 2021. He has been a Fellow of the American Physical Society since 2008 and a member of the Royal Swedish Academy of Sciences since 2019. From July 2020 till June 2023 Klaus Blaum was the Scientific Vice President for the Chemical-Physical-Technical Section of the MPG.