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Abstract |
The collapse of the canonical N = 28 magic number in nuclei with Z < 20 has drawn significant interest as it relates to the emergence of an island of inversion centered on Si-42 and S-44. In particular, interactions between the pi 2s(1/2) orbital-empty in Si-42 and full in S-44-and the neutron orbitals just above and below the N = 28 gap are expected to be critical in this region, but remain relatively unexplored. In this paper, we expand upon the results of our previous study of the direct transfer reaction K-47 (d, p gamma) K-48 [Paxman et al., Phys. Rev. Lett. 134, 162504 (2025)] with the results of the complementary 47K (d, t gamma) K-46 reaction. Through this study, we present a comprehensive scan of the interaction between the pivotal pi 2s(1/2) orbital and a broad range of neutron orbitals spanning nearly two full shells; nu(2s(1/2), 1d(3/2), 1 f(7/2), 2p(3/2), 2p(1/2), 1 f(5/2)). We identify several discrepancies between the experimental results and state-of-the-art shell model calculations, which suggest a deficiency of the shell model to fully capture the complex proton configuration mixing in this region, highlighting a significant challenge for single-particle descriptions of the island of inversion. |
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Address |
[Paxman, C. J.; Catford, W. N.; Lotay, G.; Canete, L.; Doherty, D. T.; Podolyak, Zs.] Univ Surrey, Sch Maths & Phys, Guildford GU2, England, Email: charlie.paxman@ganil.fr |
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