Continuum effect in resonance spectra of neutron-rich oxygen isotopes  

作　　者：Si-Jie Dai Fu-Rong Xu Jian-Guo Li Bai-Shan Hu Zhong-Hao Sun 戴思捷;许甫荣;李健国;胡柏山;孙中浩(School of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University;Physics Division, Oak Ridge National Laboratory)

机构地区：[1]School of Physics,and State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China [2]Physics Division,Oak Ridge National Laboratory,Oak Ridge,Tennessee 37831,USA

出　　处：《Chinese Physics C》2018年第11期100-104,共5页中国物理C（英文版）

基　　金：Supported by the National Key R&D Program of China(2018YFA0404401);the National Natural Science Foundation of China(11320101004,11575007);the China Postdoctoral Science Foundation(2018M630018);the CUSTIPEN(China U.S.Theory Institute for Physics with Exotic Nuclei)funded by the U.S.Department of Energy,Office of Science(DESC0009971);and High performance Computing Platform of Peking University

摘　　要：Starting from the CD-Bonn potential, we have performed Gamow shell-model calculations for neutronrich oxygen isotopes, investigating excitation spectra and their resonant properties. The Gamow shell model is based on the Berggren ensemble, which is capable of treating the continuum effect reasonably in weakly bound or unbound nuclei. To calculate heavier-mass oxygen isotopes, we choose ^16O as a frozen core in the Camow shell-model calculations. The first 2^＋ excitation energies of the even-even O isotopes are calculated, and compared with those obtained by the conventional shell model using the empirical USDB interaction. The continuum effect is proved to play an important role in the shell evolution near the drip line. We also discuss the effect of the Berggren contour choice. We improve the approximation in the contour choice to give more precise calculations of resonance widths.Starting from the CD-Bonn potential, we have performed Gamow shell-model calculations for neutronrich oxygen isotopes, investigating excitation spectra and their resonant properties. The Gamow shell model is based on the Berggren ensemble, which is capable of treating the continuum effect reasonably in weakly bound or unbound nuclei. To calculate heavier-mass oxygen isotopes, we choose ^16O as a frozen core in the Camow shell-model calculations. The first 2^＋ excitation energies of the even-even O isotopes are calculated, and compared with those obtained by the conventional shell model using the empirical USDB interaction. The continuum effect is proved to play an important role in the shell evolution near the drip line. We also discuss the effect of the Berggren contour choice. We improve the approximation in the contour choice to give more precise calculations of resonance widths.

关 键 词：CD-Bonn interaction Gamow shell model drip-line nuclei Berggren ensemble CONTINUUM RESONANCE 

分 类 号：O613.3[理学—无机化学]