应稀有同位素前沿科学中心邀请，萨格勒布大学Dario Vretenar教授将于2024年8月5日来校进行学术交流并作报告。

       报告题目：Theory of Nuclear Fission

       报告时间：2024年8月5日（星期一）10 : 00

       报告地点：兰州大学二分部现物楼214室

       欢迎广大师生参加！

【报告摘要】

       The process of spontaneous or induced fission, by which an atomic nucleus breaks into two or more fragments, presents, more than eight decades after its discovery, a very interesting research topic in the field of low- and medium-energy nuclear physics. From a modern perspective, nuclear fission can be considered a representative example of large-amplitude collective motion in a self-bound mesoscopic system, that exhibits both classical and quantal characteristics. In addition to important technological applications, primarily in energy production, fission is also relevant for the stability of superheavy elements, production of short-lived exotic nuclides far from stability, nuclear astrophysics, and the mechanism of nucleosynthesis.

A wealth of experimental results on nuclear fission have been accumulated, and a basic understanding of the mechanism gained. Several successful phenomenological approaches and methods have been developed that reproduce, to various degrees of accuracy, low- and medium-energy fission observables. Recently, significant advances in the microscopic description of various aspects of the fission process have been reported. These include studies of nuclear shell effects on fission observables, dynamical pairing correlations, symmetry restoration, fission in odd-mass nuclei, the energy dissipation mechanism and total kinetic energy distribution, neck dynamics, properties of fragments beyond scission, generation of fragment angular momentum, fragment distributions and their impact on r-process nucleosynthesis, element production, fission in compact stars, etc. Even though microscopic methods have been very effective in modelling specific observables, a unified framework for the description of the entire fission process remains a formidable challenge for nuclear theory.

【报告人简介】

       Dario Vretenar is professor of theoretical physics at the University of Zagreb and Head of the Nuclear Theory group. He has held postdoctoral and visiting research positions at the University of Bologna, Yale University, Technical University Munich, University of Tokyo, Peking University, and IPN Orsay. Vretenar’s research interests include nuclear energy density functionals, low-energy nuclear effective field theory, nuclear weak interactions and astrophysical applications, algebraic structure models, and fission dynamics. Among his principal contributions is the development of algebraic models for high-spin physics, applications of relativistic energy density functionals to exotic nuclear structure and weak interaction processes, prediction of novel modes of collective excitations in nuclei far from stability, description of quantum shape phase transitions in nuclei, and the development of microscopic models for fission dynamics. 

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2024年8月2日