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Spectroscopy of N=50 isotones with the valence-space density matrix renormalization group
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The recently proposed combination of the valence-space in-medium similarity renormalization group (VS-IMSRG) with the density matrix renormalization group (DMRG) offers a scalable and flexible many-body approach for strongly correlated open-shell nuclei. We use the VS-DMRG to investigate the low-lying spectroscopy of N=50 isotones, which are characteristic for their transition between single-particle and collective excitations. We also study electromagnetic transitions and show the advantage of the VS-DMRG to capture the underlying physics more efficiently, with significantly improved convergence compared to state-of-the-art shell-model truncations. Combined with an analysis of quantum information measures, this further establishes the VS-DMRG as a valuable method for ab initio calculations of nuclei.
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Competition of the shell closure and deformations across the doubly magic $^{78}$Ni
A review of recent RIBF experiments and theoretical models concludes that 78Ni is doubly magic in its ground state but shows signs of shape coexistence with deformed states nearby.
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