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Abstract:
Elliott’s SU(3) model is at the basis of the nuclear shell-model description of rotational motion in atomic nuclei. While the shell model does provide a general framework for reproducing rotational bands and shape coexistence in light- and medium-mass nuclei, it faces significant computational challenges when describing deformed nuclei in heavier mass regions. As a result, the hunt for efficient truncation schemes is a key challenge in nuclear structure theory. To address this, nucleon-pair correlation has been introduced as an effective strategy for truncating the configuration space within the shell model.
In this talk, I will introduce a recently developed method: the angular-momentum-projected particle-number-conserved BCS theory. This approach involves the intrinsic nucleon-pair condensate, where "intrinsic" condensates are constructed within the shell model space and subsequently projected onto states with good angular momentum. It bridges the shell model and deformed mean-field models. I will also present our recent work on shell-model effective interactions in the heavy-mass region, particularly near neutron number N = 82, along with findings from state-of-the-art large-scale shell-model calculations. These developments offer a comprehensive understanding of pairing, shape coexistence, shape evolution, and quantum phase transitions in atomic nuclei.
Biography:
GuanJian Fu is an Associate Professor and PhD advisor at Tongji University. He received his PhD in 2015 from Shanghai Jiao Tong University, after which he joined Tongji University as an Assistant Professor. He became an Associate Professor in 2019 and was promoted to a tenured Associate Professor in 2023. His research primarily focuses on theoretical nuclear physics, particularly in shell model, pairing theory, and nuclear mass predictions. His academic contributions include the development of the nucleon-pair approximation with isospin symmetry and the angular-momentum-projected particle-number-conserved BCS theory. He proposed the coexistence of isovector and isoscalar pairing in atomic nuclei, and his work has addressed long-standing controversies in the microscopic foundation of pairing theories, particularly in the Elliott’s SU(3) limit in deformed nuclei and has quantitatively highlighted the importance of high-angular-momentum nucleon pairs. Furthermore, he has proposed high-precision nuclear mass formulas. Dr. Fu’s research has been recognized with several awards, including the National Outstanding Young Scientist Fund and the "Hu Jimin Award" from the Chinese Nuclear Physics Society.
Host: Prof. Yu-Min Zhao
Alternative online link：https://meeting.tencent.com/dm/Tuyg2o97n1zn
ID:924550277 Password: 123456