Continuum effect in resonance spectra of neutron-rich oxygen isotopes

Si-Jie Dai; Fu-Rong Xu; Jian-Guo Li; Bai-Shan Hu; Zhong-Hao Sun

doi:10.1088/1674-1137/42/11/114106

Chinese Physics C> 2018, Vol. 42> Issue(11) : 114106 DOI: 10.1088/1674-1137/42/11/114106

Continuum effect in resonance spectra of neutron-rich oxygen isotopes

1.
School of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
2.
School of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
3.
Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

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Abstract：
Starting from the CD-Bonn potential, we have performed Gamow shell-model calculations for neutron-rich 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 Gamow 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.
- CD-Bonn interaction ,
- Gamow shell model ,
- drip-line nuclei ,
- Berggren ensemble ,
- continuum ,
- resonance

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Si-Jie Dai, Fu-Rong Xu, Jian-Guo Li, Bai-Shan Hu and Zhong-Hao Sun. Continuum effect in resonance spectra of neutron-rich oxygen isotopes[J]. Chinese Physics C, 2018, 42(11): 114106. doi: 10.1088/1674-1137/42/11/114106

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Received: 2018-07-28

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Supported by the National Key RD 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

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沈阳化工大学材料科学与工程学院沈阳 110142

Continuum effect in resonance spectra of neutron-rich oxygen isotopes

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