报告题目: On the Shell Structure of Nuclear Bubbles
报告人: Professor Krzysztof Pomorski
（Department of Theoretical Physics, Maria Curie Sklodowska University, Lublin, Poland, Europe）
时间: 2018年4月17日（周二）下午4:00
地点: 物理学院西113 会议室
报告摘要:
The shell structure of bubble nuclei was investigated in simple phenomenological shell models using Strutinsky’s method. The bunching is produced by the energy gaps between single-particle states with a different number radial nodes. Shell energies down to -40 MeV are shown to occur for certain magic nuclei. Our estimates demonstrate that the calculated shell effects for certain magic numbers of constituents are probably large enough to produce stability against fission, alpha, and beta decay. No bubble solutions are found for mass number A < 450. self-consistent calculations made with the gogny force confirms this picture but in addition predict possible existence semi-bubbles in nuclei with z>120. Even if bubble nuclei can never be made in a terrestrial laboratory, they might play a role in neutron stars.
Similar bubble effect can appear in charged metallic clusters. It was found that for a given mesoscopic system of n atoms of a given metal and q<<n (positive) elementary charges, a metallic bubble turns out to have a lower total energy than a compact spherical cluster, whenever the charge number q is larger than a critical charge number q. for magic number (n-q) of free electrons the spherical metallic bubble may become stable against fission. much simpler situation is in spherical metallic layer covering a spherical core, where the shall structure and magic-numbers are already visible in the experimental data e.g. in the photo-ionization spectra of the c60cs(n) aggregates.
联系人：孟杰（mengj@pku.edu.cn）
