Deformed in-medium similarity renormalization group
Deformed in-medium similarity renormalization group
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DOI：
10.1103/physrevc.105.l061303
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发表时间：
2022-04
影响因子：
3.1
通讯作者：
Q. Yuan;S. Fan;B. Hu;J. G. Li;S. Zhang;S. M. Wang;Z. Sun;Y. Z. Ma;F. Xu
中科院分区：
文献类型：
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作者：
Q. Yuan;S. Fan;B. Hu;J. G. Li;S. Zhang;S. M. Wang;Z. Sun;Y. Z. Ma;F. Xu
我们发展了一个开壳层核的从头算变形介质相似重整化群（IMSRG）。这是一个单参考IMSRG变形Hartree-Fock（HF）的基础。形变波函数在描述形变核时更有效。破缺的球对称性需要通过角动量投影来恢复，这是计算昂贵的。角动量主要捕获静态关联，并且可以通过HF态的投影来估计。在这项工作中，我们做了变形IMSRG计算，并添加了相关能量从投影HF作为一个领先的顺序近似。作为实验基础，我们用优化的手征相互作用NNLO opt计算了形变的8，10 Be同位素。结果与无核壳模型和价空间IMSRG计算基准。然后，我们系统地研究了从轻铍到中等质量镁的偶偶同位素的基态能量和电荷半径。计算出的能量以指数形式外推到无限基空间，并与外推的价空间IMSRG结果和实验数据进行了比较。
We have developed an ab initio deformed in-medium similarity renormalization group (IMSRG) for open-shell nuclei. This is a single-reference IMSRG in deformed Hartree-Fock (HF) basis. Deformed wave functions are more efficient in describing deformed nuclei. The broken spherical symmetry needs to be restored by angular momentum projection, which is computational expensive. The angular momentum mainly capture the static correlations and can be estimated by the projection of the HF state. In this work, we do deformed IMSRG calculation and add the correlation energy from projected HF as a leading order approximation. As the test ground, we have calculated the deformed 8 , 10 Be isotopes with the optimized chiral interaction NNLO opt . The results are benchmarked with the no-core shell model and valence space IMSRG calculations. Then we systematically investigated the ground-state energies and charge radii of even-even isotopes from light beryllium to medium-mass magnesium. The calculated energies are extrapolated to infinite basis space by an exponential form, and compared with the extrapolated valence-space IMSRG results and experimental data available.