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

One of the strongest challenges to the shell-model concept of nuclei are the islands of inversion, where empirical evidence shows the ground states being dominated by intruder configurations, i.e., states that would be excitations in the normal shell-model picture. Whereas phenomenological calculations have previously supported this concept, the work of Miyagi e00ext a00exl. demonstrates how one can arrive at these non-intuitive results from an a00exb i00exn00exi00ext00exi00exo perspective.