Ab Initio calculations of even oxygen isotopes with chiral two-plus-three-nucleon interactions.
Ab Initio calculations of even oxygen isotopes with chiral two-plus-three-nucleon interactions.
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DOI：
10.1103/physrevlett.110.242501
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发表时间：
2013-02
影响因子：
8.6
通讯作者：
H. Hergert;S. Binder;A. Calci;J. Langhammer;R. Roth
中科院分区：
文献类型：
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作者：
H. Hergert;S. Binder;A. Calci;J. Langhammer;R. Roth
我们使用基于量子化学中引入的广义威克定理的多参考形式主义，制定了开壳核的介质内相似性重整化群（IM-SRG）。由此产生的多参考 IM-SRG (MR-IM-SRG) 用于对具有手性核子-核子和三核子相互作用的所有偶数氧同位素（从质子到中子滴线）进行首次从头开始研究。我们获得了具有量化不确定性的实验基态能量的出色再现，这通过重要性截断无核壳模型和耦合聚类方法的结果得到了验证。概念上不同的多体方法和实验之间的一致性凸显了当前手性二核子和三核子相互作用的预测能力，并将 MR-IM-SRG 确立为一种有前途的新工具，用于从头计算远离壳层闭合的中等质量核。
We formulate the in-medium similarity renormalization group (IM-SRG) for open-shell nuclei using a multireference formalism based on a generalized Wick theorem introduced in quantum chemistry. The resulting multireference IM-SRG (MR-IM-SRG) is used to perform the first ab initio study of all even oxygen isotopes with chiral nucleon-nucleon and three-nucleon interactions, from the proton to the neutron drip lines. We obtain an excellent reproduction of experimental ground-state energies with quantified uncertainties, which is validated by results from the importance-truncated no-core shell model and the coupled cluster method. The agreement between conceptually different many-body approaches and experiment highlights the predictive power of current chiral two- and three-nucleon interactions, and establishes the MR-IM-SRG as a promising new tool for ab initio calculations of medium-mass nuclei far from shell closures.