Institut für Kernphysik, Technische Universität Darmstadt, Germany.
Phys Rev Lett. 2012 Aug 3;109(5):052501. doi: 10.1103/PhysRevLett.109.052501. Epub 2012 Jul 31.
We study the use of truncated normal-ordered three-nucleon interactions in nuclear structure calculations starting from chiral two- plus three-nucleon Hamiltonians evolved consistently with the similarity renormalization group. We present three key developments: (i) a rigorous benchmark of the normal-ordering approximation in the importance-truncated no-core shell model for (4)He, (16)O, and (40)Ca; (ii) a direct comparison of the importance-truncated no-core shell model results with coupled-cluster calculations at the singles and doubles level for (16)O; and (iii) first applications of similarity renormalization group-evolved chiral NN+3N Hamiltonians in coupled-cluster calculations for medium-mass nuclei (16,24)O and (40,48)Ca. We show that the normal-ordered two-body approximation works very well beyond the lightest isotopes and opens a path for studies of medium-mass and heavy nuclei with chiral two- plus three-nucleon interactions. At the same time we highlight the predictive power of chiral Hamiltonians.
我们从手征双三体相互作用出发，通过相似重整化群演化，研究了截断正则序三体相互作用在核结构计算中的应用。我们提出了三个关键的进展：（i）在重要截断无核壳模型中对正则序近似进行了严格的基准测试，研究对象为 (4)He、(16)O 和 (40)Ca；（ii）直接比较了重要截断无核壳模型结果与单粒子和双粒子水平的耦合簇计算结果，研究对象为 (16)O；（iii）首次在手征 NN+3N 哈密顿量相似重整化群演化的基础上，将其应用于中质量核 (16,24)O 和 (40,48)Ca 的耦合簇计算中。我们表明，正则序二体近似在轻同位素之外的区域效果非常好，为使用手征双三体相互作用研究中质量和重核开辟了道路。同时，我们强调了手征哈密顿量的预测能力。
