Topic（题目）：Calculations of reaction observables at drip-lines with the coupled-channel Gamow shell model

Speaker（报告人）：Nicolas Michel  (Institute of Modern Physics)  

Date（时间）： 2022年10月21号（周五）下午3:30-5:00

Place（地点）： 北京大学加速器楼402 会议室

Contact Person（联系人）：许甫荣（frxu@pku.edu.cn）

Abstract（摘要）:

The Gamow shell model (GSM) has shown to be a powerful tool to study nuclei at drip-lines. It is a shell model approach based on the Berggren basis, consisting of bound, resonance and scattering states. GSM then recaptures both continuum coupling at basis level and inter-nucleon correlations via configuration mixing. However, GSM is essentially a structure model despite the presence of scattering basis states. Indeed, one cannot impose incoming or outgoing channels in GSM scattering eigenstates, so that reaction observables cannot be devised therein. Thus, GSM has been extended to the coupled-channel GSM (GSM-CC) in order to calculate reaction observables. Channel states are then built from target and projectile states issued from GSM, whose incoming or outgoing character can be handled with standard reaction coupled-channel equations. It is then possible to calculate elastic, inelastic scattering, as well as radiative capture cross sections. We will then present the most recent applications of GSM-CC. We evaluated the elastic cross section of the 15O(p,p) reaction and the radiative capture cross section of the 8Li(n,γ) reaction. Continuum coupling is indeed prominent as 16F is unbound, while 8,9Li only have two neutron-bound states in their spectrum. While GSM-CC was initially devised with nucleon projectiles, it is currently upgraded to the use of many-nucleon projectiles. The first application in this context was the calculation of cross sections of the 4He(d,d) elastic scattering reaction. We will also present the most recent calculations of cross sections of the 4He(3H,3H) elastic scattering reaction. While experimental data are satisfactorily reproduced, many-nucleon projectiles lead to difficulties absent from the one-nucleon case. Possible solutions for that matter will be discussed.

报告人简介：

Ph.D. in GANIL obtained in 2002

Post-doctoral employments in ORNL, Kyoto University, CEA Saclay, University of Jyvaskyla, MSU, GANIL from 2003 to 2015

Visiting professor in MSU from 2016 to 2018

Visiting professor in PKU in 2018

Professor at IMP since 2019