Abstract
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 , , and ; (ii) a direct comparison of the importance-truncated no-core shell model results with coupled-cluster calculations at the singles and doubles level for ; and (iii) first applications of similarity renormalization group-evolved chiral Hamiltonians in coupled-cluster calculations for medium-mass nuclei and . 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.
- Received 1 December 2011
DOI:https://doi.org/10.1103/PhysRevLett.109.052501
© 2012 American Physical Society