Jansen G R, Engel J, Hagen G, Navratil P, Signoracci A
Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
Deptartment of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27516-3255, USA.
Phys Rev Lett. 2014 Oct 3;113(14):142502. doi: 10.1103/PhysRevLett.113.142502.
We derive and compute effective valence-space shell-model interactions from ab initio coupled-cluster theory and apply them to open-shell and neutron-rich oxygen and carbon isotopes. Our shell-model interactions are based on nucleon-nucleon and three-nucleon forces from chiral effective-field theory. We compute the energies of ground and low-lying states, and find good agreement with experiment. In particular, our computed 2(+) states are consistent with N = 14,16 shell closures in (22,24)O, and a weaker N=14 shell closure in (20)C. We find good agreement between our coupled-cluster effective-interaction results with those obtained from standard single-reference coupled-cluster calculations for up to eight valence neutrons.
我们从第一性原理耦合簇理论推导并计算了有效的价空间壳模型相互作用，并将其应用于开壳层和富中子的氧和碳同位素。我们的壳模型相互作用基于手征有效场理论中的核子 - 核子和三核子力。我们计算了基态和低激发态的能量，并与实验结果取得了良好的一致性。特别是，我们计算得到的2(+)态与(22,24)O中N = 14、16的壳层闭壳结构一致，而在(20)C中N = 14的壳层闭壳结构较弱。我们发现，对于多达八个价中子的情况，我们的耦合簇有效相互作用结果与从标准单参考耦合簇计算得到的结果之间具有良好的一致性。
