报告题目：Nuclear collective motions generated by two-body external fields

报告时间：2024-3-6

主办方：复旦大学 核科学与技术系/现代物理研究所、核物理与离子束应用教育部重点实验室、国家自然科学基金委-理论物理专款上海核物理理论研究中心

协办方: 《Nuclear Science and Techniques》&《核技术》刊物

摘要：A nucleus is a good stage to study a many-body quantum system in nature. In particular, excited nuclei generates a variety of vibrations, rotations, and so on. They are called nuclear collective motions in general. It is known that the leading-order effect of nuclear vibrational excitations is 1 particle-1 hole states, which have been studied very well in the past. However, higher-order correlations beyond 1 particle-1 hole states become important when the excitation energy increases. The 2 particle-2 hole states, the so-called doorway states, are considered to be the next leading-order effect of nuclear excitations. Recently, effects of meson-exchange current and neutrino deep inelastic scatterings (both are 2-body interactions) on finite nuclei attract attention from interests on muon capture studies and high-energy neutrino detections. To understand those phenomena from nuclear physics point of view, a study of 2 particle-2 hole correlations of nuclei is inevitable. We recently carried out a microscopic study of 2 particle-2 hole states within second-random-phase approximation and studied nuclear responses against 1-body and 2-body external fields. We found that the coupling of 1 particle-1 hole and 2 particle-2 hole states depends on the nuclear excitation energies. In addition, depending on type of external fields operating the nucleus, nuclei show a different collectivity.We will demonstrate the detail in this talk and discuss a future plan to apply our framework to apply the meson-exchange current on finite nuclei.

报 告 人： Futoshi Minato (湊 太志) 教授

日本九州大学

报告人简介：Prof. Futoshi Minato is an esteemed Associate Professor at Kyushu University, renowned for his theoretical research in nuclear physics. His illustrious academic journey commenced at Tohoku University, where he earned his Bachelor's, Master's, and Ph.D. degrees between 2000 and 2009. Prof. Minato specializes in the theoretical aspects of nuclear physics, with a keen focus on nuclear structures and interactions. He has played pivotal roles in various scientific committees, significantly contributing to the advancement of nuclear physics research and development. His distinguished work has earned him prestigious awards, such as The 52nd Thesis Award of the Atomic Energy Society of Japan in 2020 and the Young Scientist Award of the Physical Society of Japan in 2014. These honors underscore his profound contributions to our understanding of nuclear phenomena, including muon reactions and the influence of tensor force on β decay of nuclei. Prof. Minato's career exemplifies a steadfast dedication to research excellence and leadership within the scientific community, establishing him as a prominent figure in the field of nuclear physics.