Phys.Rev. C 102, 034320 (2020)

T.Miyagi, S.R.Stroberg, J.D.Holt, N.Shimizu

Ab initio multishell valence-space Hamiltonians and the island of inversion

NUCLEAR STRUCTURE ¹⁶O; calculated levels, J, π, single-particle energies with ⁴He core and psd valence space, ground-state energies and expectation values of the Hamiltonian with the ⁴He and p, pd_5/2, pd_5/2s_1/2, and psd valence spaces. ^{26,28,30,32,34}Ne, ^{28,30,32,34,36}Mg, ^{30,32,34,36,38}Si; calculated excitation energies of the first excited 0+ states, and the number of exciting neutrons from sd to pf orbits. ^{20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37}Ne, ^{22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39}Mg, ^{24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42}Si; calculated ground-state energies, S(2n), energies of the first 2+ states and corresponding B(E2) values for even-even nuclei. ^26,30Ne, ³²Mg, ³⁴Si; calculated energies and B(E2) of the 0+ and 2+ excited states from sd and sdf_7/2p_3/2 orbitals. ^{14,15,16,17,18,19,20,21,22}O; calculated ground-state energies and charge radii. ^{40,41,42,43,44,45,46,47,48}Ca; calculated changes in charge radii. Valence-space in-medium similarity renormalization group (VS-IMSRG) approach to derive the first multishell valence-space Hamiltonians from ab initio theory for calculation of properties of nuclei in the island-of-inversion region above oxygen. Comparison with experimental data.

doi: 10.1103/PhysRevC.102.034320