Nucleus-Dependent Valence-Space Approach to Nuclear Structure

• Published in: Physical review letters 2017-01, Vol.118 (3), p.032502-032502
• Main Authors: Stroberg, S R, Calci, A, Hergert, H, Holt, J D, Bogner, S K, Roth, R, Schwenk, A
• Format: Article
• Language: English
• Subjects: Carbon; Convergence; Grounds; Mathematical analysis; Nuclear structure; Nuclei; Nucleons; Physics; Similarity
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.118.032502

We present a nucleus-dependent valence-space approach for calculating ground and excited states of nuclei, which generalizes the shell-model in-medium similarity renormalization group to an ensemble reference with fractionally filled orbitals. Because the ensemble is used only as a reference, and not to represent physical states, no symmetry restoration is required. This allows us to capture three-nucleon (3N) forces among valence nucleons with a valence-space Hamiltonian specifically targeted to each nucleus of interest. Predicted ground-state energies from carbon through nickel agree with results of other large-space ab initio methods, generally to the 1% level. In addition, we show that this new approach is required in order to obtain convergence for nuclei in the upper p and sd shells. Finally, we address the 1^{+}/3^{+} inversion problem in ^{22}Na and ^{46}V. This approach extends the reach of ab initio nuclear structure calculations to essentially all light- and medium-mass nuclei.