应稀有同位素前沿科学中心邀请，俄罗斯杜布纳联合原子核研究所Arsenyev Nikolay研究员将于2025年10月10日来校进行学术交流并作报告。

报告题目： Fine structure of the isoscalar giant monopole resonance in spherical nuclei

报告时间：2025年10月10日（星期五）15:30

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】

A comprehensive analysis of the isoscalar giant monopole resonance (ISGMR) has long been a subject of extensive theoretical and experimental studies. The ISGMR properties are presently an important problem not only from the nuclear structure point of view but also because of the special role they play in many astrophysical processes such as prompt supernova explosions and the interiors of neutron stars.

The random phase approximation (RPA) with the Skyrme-type energy-density functional (EDF) is the most widely used theoretical model for describing the ISGMR. The study of the monopole strength distribution in the region of giant resonance involves taking into account a coupling between the simple particle-hole excitations and more complicated configurations.

In the present report, we discuss the effects of the coupling between one-, and two-phonon terms in the wave functions on the fine structure of the ISGMR in spherical nuclei. The effects of the phonon-phonon coupling (PPC) lead to a redistribution of the main monopole strength to lower energy states and into higher energy tail. In particular, the PPC predictions of the fine structure of the ISGMR in 58Ni, 90Zr, 120Sn, and 208Pb are in good agreement with the fine structure which is extracted from experimental data analysis.

【报告人简介】

Dr. Arsenyev Nikolay is a Senior Researcher at the Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research (JINR) in Dubna, Russia. He has expertise of nuclear density functional theory like Skyrme interaction (includes Bogoliubov-Hartree-Fock and quasiparticle random-phase approximations-QRPA). He also has experience in modeling the effects of the coupling between the one-, two-and three-phonon components in the wave functions of excited states, analyzing the influence of 2p-2h and 3p-3h configurations on the properties of the low-lying and high-lying E0, E1, and E2 strength distributions in nuclei near ⁴⁸Ca, ⁷⁸Ni, ⁹⁰Zr, ¹³²Sn, and ²⁰⁸Pb; also the nuclear weak interaction processes (electron capture and β-decay). Additionally, He is also interested in the random matrix theory. Dr. Arsenyev received many awards for his contributions, including the encouraging prize for theoretical Physics Research, Blokhintsev prize for young scientists (twice), Smorodinsky prize for young scientists (twice), Soloviev prize for young scientists (twice). Dr. Arsenyev has published 59 papers with 402 citations.

稀有同位素前沿科学中心

2025年10月9日