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Sun, Y.L.; Obertelli, A.; Doornenbal, P.; Barbieri, C.; Chazono, Y.; Duguet, T.; Liu, H.N.; Navrátil, P.; Nowacki, F.; Ogata, K.; Otsuka, T.; Raimondi, F.; Somà, V.; Utsuno, Y.; Yoshida, K.; Achouri, N.; Baba, H.; Browne, F.; Calvet, D.; Château, F.; Chen, S.; Chiga, N.; Corsi, A.; Cortés, M.L.; Delbart, A.; Gheller, J.-M.; Giganon, A.; Gillibert, A.; Hilaire, C.; Isobe, T.; Kobayashi, T.; Kubota, Y.; Lapoux, V.; Motobayashi, T.; Murray, I.; Otsu, H.; Panin, V.; Paul, N.; Rodriguez, W.; Sakurai, H.; Sasano, M.; Steppenbeck, D.; Stuhl, L.; Togano, Y.; Uesaka, T.; Wimmer, K.; Yoneda, K.; Aktas, O.; Aumann, T.; Chung, L.X.; Flavigny, F.; Franchoo, S.; Gašparić, I.; Gerst, R.-B.; Gibelin, J.; Hahn, K.I.; Kim, D.; Koiwai, T.; Kondo, Y.; Koseoglou, P.; Lee, J.; Lehr, C.; Linh, B.D.; Lokotko, T.; MacCormick, M.; Moschner, K.; Nakamura, T.; Park, S.Y.; Rossi, D.; Sahin, E.; Sohler, D.; Söderström, P.-A.; Takeuchi, S.; Törnqvist, H.; Vaquero, V.; Wagner, V.; Wang, S.; Werner, V.; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L.
Physics letters. B, 03/2020, Letnik: 802Journal Article
We report on the first γ-ray spectroscopy of 51,53K produced via the 52,54Ca(p,2p) reactions at ∼250 MeV/nucleon. Unambiguous final-state angular-momentum assignments were achieved for beam intensities down to few particles per second by using a new technique based on reaction vertex tracking combined with a thick liquid-hydrogen target. Through γ-ray spectroscopy and exclusive parallel momentum distribution analysis, 3/2+ ground states and 1/2+ first excited states in 51,53K were established quantifying the natural ordering of the 1d3/2 and 2s1/2 proton-hole states that are restored at N = 32 and 34. State-of-the-art ab initio calculations and shell-model calculations with improved phenomenological effective interactions reproduce the present data and predict consistently the increase of the E(1/21+) - E(3/21+) energy differences towards N = 40.
