{"paper":{"title":"How Robust is the N = 34 Subshell Closure? First Spectroscopy of $^{52}$Ar","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. Corsi, A. Delbart, A. Giganon, A. Gillibert, A. Obertelli, A. Schwenk, B. D. Linh, C. A. Bertulani, 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. Ga\\v{s}pari\\'c, I. Murray, J. D. Holt, J. Gibelin, J. Lee, J.-M. Gheller, K. I. Hahn, K. Moschner, K. Wimmer, K. Yoneda, L. Stuhl, L. X. Chung, L. Zanetti, M. L. Cort\\'es, M. MacCormick, M. Sasano, M. Yasuda, N. Achouri, N. Chiga, N. Paul, O. Aktas, P.-A. S\\\"oderstr\\\"om, P. Doornenbal, P. Koseoglou, R. -B. Gerst, R. Stroberg, S. Chen, S. Franchoo, S. Takeuchi, S. Wang, S. Y. Park, T. Aumann, T. D. Morris, T. Isobe, T. Kobayashi, T. Koiwai, T. Lokotko, T. Motobayashi, T. Nakamura, T. Uesaka, V. Lapoux, V. Panin, V. Vaquero, V. Wagner, V. Werner, W. Rodriguez, X. Xu, Y. Kondo, Y. Kubota, Y. L. Sun, Y. Togano, Z. Yang","submitted_at":"2018-11-20T19:26:45Z","abstract_excerpt":"The first $\\gamma$-ray spectroscopy of $^{52}$Ar, with the neutron number N = 34, was measured using the $^{53}$K(p,2p) one-proton removal reaction at $\\sim$210 MeV/u at the RIBF facility. The 2$^{+}_{1}$ excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N $>$ 20. This result is the first experimental signature of the persistence of the N = 34 subshell closure beyond $^{54}$Ca, i.e., below the magic proton number Z = 20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 2$^{+}_{1}$ systemat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.08451","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}