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Abstract：
Nuclear collective vibration provides deep insight in understanding the origin of heavy elements in the universe as well as the nuclear equation of state (EoS). For example, the Gamow-Teller transitions determine the beta-decay half-lives as important inputs for the nucleosynthesis study, while the giant monopole resonance (GMR) provides direct constraints on nuclear incompressibility, a key parameter of nuclear EoS. The quasiparticle random phase approximation model is the most commonly used microscopic model to study the collective vibration of atomic nuclei. However, due to the lack of higher-order many-body correlations beyond the mean field, the resonance width cannot be given, and serious problems are encountered when describing beta-decay lifetime and GMR energies. In this talk, I will introduce how to solve the above problems by developing a quasiparticle random phase approximation + quasiparticle vibration coupling model which considers higher-order many-body correlations. Furthermore, facing various modes of nuclear collective vibrations, the photonuclear reaction is limited to the study of nuclear dipole excitations. I will discuss new possibilities to excite different modes of nuclear collective vibrations with vortex photons.
Biography:
Yifei Niu is a professor at the School of Nuclear Science and Technology of Lanzhou University. She obtained her bachelor's degree and doctor degree from Peking University in 2007 and 2012, respectively. From 2012 to 2013, she served as an assistant researcher at the China Academy of Engineering Physics. From 2013 to 2016, she pursued postdoctoral research at the Istituto Nazionale di Fisica Nucleare (INFN) in Italy. In September 2016, she got a tenured position at the Extreme Light Infrastructure - Nuclear Physics (ELI-NP) funded by the European Union. In September 2018, she was recruited as a professor by Lanzhou University. She has been selected for the oversea young talent recruitment program and awarded the 8th " Jimin Hu’s Education and Science Scholarship." Her primary research focus is on nuclear structure theory, particularly the theoretical study of collective vibrational modes and weak interaction processes in atomic nuclei. She has published over 90 SCI papers in academic journals such as "Prog. Part. Nucl. Phys.," "Phys. Rev. Lett.," "Phys. Lett. B," and "Phys. Rev. C."
Host: Prof. Yifeng Sun
Alternative online link: https://meeting.tencent.com/dm/6h24LxNqajAk (id: 656625724 passcode: 123456）