IBS Publications Repository: Level structures of 56,58Ca cast doubt on a doubly magic 60Ca

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Level structures of 56,58Ca cast doubt on a doubly magic 60Ca

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Author(s): Chen, S.; Browne, F.; Doornenbal, P.; Lee, J.; Obertelli, A.; Tsunoda, Y.; Otsuka, T.; Chazono, Y.; Hagen, G.; Holt, J.D.; Jansen, G.R.; Ogata, K.; Shimizu, N.; Utsuno, Y.; Yoshida, K.; Achouri, N.L.; Baba, H.; Calvet, D.; Chateau, F.; Chiga, N.; Corsi, A.; Cortes, M.L.; Delbart, A.; Gheller, J.-M.; Giganon, A.; Gillibert, A.; Hilaire, C.; Isobe, T.; Kobayashi, T.; Kubota, Y.; Lapoux, V.; Liu, H.N.; Motobayashi, T.; Murray, I.; Otsu, H.; Panin, V.; Paul, N.; Rodriguez, W.; Sakurai, H.; Sasano, M.; Steppenbeck, D.; Laszlo Stuhl; Sun, Y.L.; Togano, Y.; Uesaka, T.; Wimmer, K.; Yoneda, K.; Aktas, O.; Aumann, T.; Chung, L.X.; Flavigny, F.; Franchoo, S.; Gasparic, I.; Gerst, R.-B.; Gibelin, J.; Kevin Insik Hahn; Da Hee Kim; Koiwai, T.; Kondo, Y.; Koseoglou, P.; Lehr, C.; Linh, B.D.; Lokotko, T.; MacCormick, M.; Moschner, K.; Nakamura, T.; S.Y. Park; Rossi, D.; Sahin, E.; Soderstrom, P.-A.; Sohler, D.; Takeuchi, S.; Tornqvist, H.; Vaquero, V.; Wagner, V.; Wang, S.; Werner, V.; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L.

Journal: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v.843

Abstract: Gamma decays were observed in 56Ca and 58Ca following quasi-free one-proton knockout reactions from 57,59Sc beams at ≈200 MeV/nucleon. For 56Ca, a γ ray transition was measured to be 1456(12) keV, while for 58Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the 21+→0gs+ decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for 21+ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the 0f5/2 and 0g9/2 orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic 60Ca and potentially drives the dripline of Ca isotopes to 70Ca or even beyond. © 2023 The Author(s)