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Alexey Severyukhin教授将于2025年10月10日来校进行学术交流并作报告。

报告题目： Gamow-Teller decay studies within Quasiparticle Phonon Model

报告时间：2025年10月10日（星期五）14 : 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】

The β-decay properties are very important for understanding the nuclear structure evolution at extreme N/Z ratios, for analysis of radioactive ion-beam experiments, and modeling of the astrophysical r-process. For this reason, the theoretical calculations of the β-decay properties of the “waiting-point nuclei” ¹²⁹Ag, ¹³⁰Cd, and ¹³¹In provides the valuable information. One of the successful tools for nuclear structure studies is the quasiparticle random phase approximation (QRPA) with the self-consistent mean-field derived from the Skyrme energy density functional (EDF). The framework allows to relate the properties of the ground states and excited states through the EDF. There is the discrepancy between the QRPA predictions and the measurements for low-energy 1⁺ spectrum of the daughter nucleus, see as an example [1]. The number of low-lying 1⁺ states and the corresponding Gamow-Teller fragmentation are naturally reproduced by the inclusion of the tensor correlations and the coupling between one- and two-phonon terms in the 1⁺ wave functions [2-4]. We applied the influence of the phonon-phonon coupling on the probability of the neutron emission occurring at very small quantity of energy available in β-decay. Onset of delayed neutron emission in Cd isotopic chain is discussed.

[1] A. Etilé et al., Phys. Rev. C 91, 064317 (2015).

[2] A.P. Severyukhin et al., Phys. Rev. C 90, 044320 (2014).

[3] A.P. Severyukhin et al., Phys. Rev. C 95, 034314 (2017).

[4] A.P. Severyukhin et al., Phys. Rev. C 101, 054309 (2020).

【报告人简介】

Professor Alexey Severyukhin is a Senior Researcher at the Bogoliubov Laboratory of Theoretical Physics (BLTP), Joint Institute for Nuclear Research (JINR) in Dubna, Russia. He is an expert in microscopic nuclear models, energy-density functional theory, random phase approximation, generator coordinate method, and random matrix theory, with which he studies low-energy vibrational excitations, giant resonances, Gamow-Teller resonances, beta-decay, beta-delayed neutron emission. Prof. Severyukhin has received many awards for his contributions, including the First Prize in Experimental Physics from JINR in 2017, as well as the Blokhintsev Prize for Young Scientists in 2008 and 2009. As a member of organizing committee, he organized the “LXXIV International conference Nucleus-2024: Fundamental problems and applications" and the "International School on Nuclear Theory and Astrophysical Applications" at JINR.

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2025年10月1日