{"paper":{"title":"Level Structures of $^{56,58}$Ca Cast Doubt on a doubly magic $^{60}$Ca","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. Corsi, A. Delbart, A. Giganon, A. Gillibert, A. Obertelli, B.D. Linh, C. Hilaire, C. Lehr, D. Calvet, D. Kim, D. Rossi, D. Sohler, D. Steppenbeck, D. Yan, E. Sahin, F. Browne, F. Ch\\^ateau, F. Flavigny, G. Hagen, G.R. Jansen, H. Baba, H.N. Liu, H. Otsu, H. Sakurai, H. T\\\"ornqvist, H. Yamada, I. Gasparic, I. Murray, J.D. Holt, J. Gibelin, J. Lee, J.-M. Gheller, K.I. Hahn, K. Moschner, K. Ogata, K. Wimmer, K. Yoneda, K. Yoshida, L. Stuhl, L.X. Chung, L. Zanetti, M.L. Cort\\'es, M. MacCormick, M. Sasano, M. Yasuda, N. Chiga, N.L. Achouri, N. Paul, N. Shimizu, O. Aktas, P.-A. S\\\"oderstr\\\"om, P. Doornenbal, P. Koseoglou, R.-B. Gerst, S. Chen, S. Franchoo, S. Takeuchi, S. Wang, S.Y. Park, T. Aumann, T. Isobe, T. Kobayashi, T. Koiwai, T. Lokotko, T. Motobayashi, T. Nakamura, T. Otsuka, T. Uesaka, V. Lapoux, V. Panin, V. Vaquero, V. Wagner, V. Werner, W. Rodriguez, X. Xu, Y. Chazono, Y. Kondo, Y. Kubota, Y.L. Sun, Y. Togano, Y. Tsunoda, Y. Utsuno, Z. Yang","submitted_at":"2023-07-13T22:02:00Z","abstract_excerpt":"Gamma decays were observed in $^{56}$Ca and $^{58}$Ca following quasi-free one-proton knockout reactions from $^{57,59}$Sc beams at $\\approx 200$ MeV/nucleon. For $^{56}$Ca, a $\\gamma$ ray transition was measured to be 1456(12) keV, while for $^{58}$Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the $2^+_1 \\rightarrow 0^+_{gs}$ 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 d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.07077","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2307.07077/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}