应稀有同位素前沿科学中心、核科学与技术学院邀请，核科学与技术学院Saito Takehiko教授将进行线上学术交流并做学术报告，欢迎广大师生参加。

       报告题目：New directions in hypernuclear physics: with heavy io beams, nuclear emulsions and machine learning

       报告人：Saito Takehiko教授

       报告时间：2022年5月12日下午 16:00

       报告地点：城关校区东区核学楼221报告厅（腾讯会议号：593-498-586）

       报告摘要：

       Studies of hypernuclei, subatomic bound systems with strange quark, have been contributing for understanding the fundamental baryonic interactions as well as the nature of dense nuclear matters. Hypernuclei have already been studied for almost seven decades in reactions with cosmic-rays and with meson- and electron-beams. In recent years, hypernuclei are also studied in experiments employing energetic heavy ion beams, and some of these experiments have revealed unexpected results on three-body hypernuclear states, i.e., shorter lifetime and larger binding energy of the lightest hypernucleus, the hypertriton, than those formerly determined. The result of the HypHI experiment also showed the indication of an unprecedented bound state with a Lambda hyperon with two neutrons. These results have initiated several ongoing experimental programs all over the world to study these three-body hypernuclear states precisely. We are studying those light hypernuclear states by employing different approaches from the other experiments [1]. We employ heavy ion beams on fixed nuclear targets to produce hypernuclei measured by the WASA detector and the Fragment separator FRS at GSI in Germany in order to determine their lifetime precisely. The first experiment with the WASA and FRS (the WASA-FRS HypHI experiment) has been conducted in March 2022. We also analyze the entire volume of the nuclear emulsion irradiated by kaon beams in the J-PARC E07 experiment in order to measure their binding energies at the world best precision. We are using Machine Learning techniques for the both projects. In the seminar, these projects will be discussed on details, and our perspective with heavy ion beams at HIAF in China and at FAIR in Germany and with nuclear emulsions + machine learning will also be discussed.

 

       报告人简介：

       Current positions: Professor, School of Nuclear Science and Technology, Lanzhou University, China, 

       Chief scientist, High Energy Nuclear Physics Laboratory, Cluster for Pioneering Research, RIKEN, Japan (main affiliation).

       Group leader, HRS-HYS group for hypernuclear studies, GSI, Germany.

       Brief biography:

       1996, Master degree, University of Tsukuba, Japan, for experimental nuclear structure studies.

       1999, Ph.D., the Niels Bohr Institute, University of Copenhagen, Denmark, for experimental nuclear structure studies.

       1999-2001, postdoc, the Brookhaven National Laboratory and VA TECH, USA, for experimental studies of nucleon structures.

       2002-2002, postdoc, the Max-Plank-institute fuer Kernphysik, Germany, for high energy astrophysics.

       2002-2006, postdoc, GSI, Germany, for experimental nuclear structure studies.

       2006-current, group leader, the hypernuclear physics group, GSI, Germany.

       2007-2012, professor, Mainz University in Germany.

       2019-current, chief scientist, High Energy Nuclear Physics Laboratory, Cluster for Pioneering Research, RIKEN, Japan.

       2019-current, professor, School of Nuclear Science and Technology, Lanzhou University, China.