报告题目: Superheavy magic structures and relativistic pseudo-spin symmetry
报告 人：Prof. Nguyen Van Giai (Institut de Physique Nucléaire, Université Paris-Sud/CNRS， France)
报告时间：5月13日（周一）下午2:00，地点：田家炳楼南楼205
邀请 人：蒋维洲
摘要 : We have explored the occurrence of the spherical shell closures for superheavy nuclei in the framework of the relativistic Hartree-Fock-Bogoliubov (RHFB) theory and the shell effects in terms of two-nucleon gaps. Although the results depend slightly on the forces used, the general set of magic numbers beyond 208Pb are predicted as Z=120, 138 for protons and N=172, 184, 228 and 258 for neutrons, respectively. Specifically the RHFB calculations favor the nuclide ^{304}120 as the next spherical doubly magic one beyond 208Pb. As indicated by the self-consistent calculations, the occurrences of superheavy shell closures are essentially related with the violation and restoration of relativistic pseudo-spin symmetry. Further analysis imply that the shell effects are sensitive to both the values of scalar and nonrelativistic effective masses, which together with the violation of the relativistic symmetry may interpret the origin of model deviations.
Biography:
1961 : Graduate of Ecole Polytechnique, Paris.
1963 : Graduate of Université Paris-Sud, Licencié en Sciences Physiques.
1972 : Graduate of Université Paris-Sud, Doctorat d’Etat en Physique.
September 2007 - present date: Directeur de Recherche Emérite, Centre National de la Recherche Scientifique (CNRS) .
October 1, 1983-August 2007: Directeur de Recherche CNRS, Head of Groupe de Theoreque, Institut de Physique Nucléaire,
Prof. N.V. Giai is one of pioneers in developing the nuclear many-body theory. His well-quoted works concern the relativistic Hartree-Fock approach for finite nuclei, relativistic random phase approximations in giant resonances, and non-relativistic approaches for various many-body systems as well. His current research activity covers mainly two fields where he is involved in theoretical studies: 1)Structure of unstable nuclei studied in a microscopic approach (non-relativistic and relativistic mean field, random phase approximation for particles and quasiparticles; 2)Effects of nuclear structure on the physics of neutron stars. He has more than 250 publications. He is also an excellent organizer for many international collaborations and conferences. In recent years, he has pushed and operated a few Sino-French scientific programs.
