A first glimpse at the shell structure beyond 54Ca: Spectroscopy of 55K, 55Ca, and 57Ca

Koiwai, T.; Wimmer, K.; Doornenbal, P.; Obertelli, A.; Barbieri, C.; Duguet, T.; Holt, J.D.; Miyagi, T.; Navrátil, P.; Ogata, K.; Shimizu, N.; Somà, V.; Utsuno, Y.; Yoshida, K.; Achouri, N.L.; 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.; Liu, H.N.; Motobayashi, T.; Murray, I.; Otsu, H.; Panin, V.; Paul, N.; Rodriguez, W.; Sakurai, H.; Sasano, M.; Steppenbeck, D.; Stuhl, L.; Sun, Y.L.; Togano, Y.; Uesaka, T.; Yoneda, K.; Aktas, O.; Aumann, T.; Chung, L.X.; Flavigny, F.; Franchoo, S.; Gašparić, Igor; Gerst, R.-B.; Gibelin, J.; Hahn, K.I.; Kim, D.; 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.; Söderström, P.-A.; Sohler, D.; Takeuchi, S.; Toernqvist, H.; Vaquero, V.; Wagner, V.; Wang, S.; Werner, V.; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L. (2022) A first glimpse at the shell structure beyond 54Ca: Spectroscopy of 55K, 55Ca, and 57Ca. Physics letters. B, 827 . ISSN 0370-2693

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Abstract

States in the N = 35 and 37 isotopes Ca-55, Ca-57 have been populated by direct proton-induced nucleon removal reactions from Sc-56, Sc-58 and Ca-56 beams at the RIBF. In addition, the (p, 2p) quasi-free single-proton removal reaction from Ca-56 was studied. Excited states in K-55, Ca-55, and Ca-57 were established for the first time via in-beam gamma-ray spectroscopy. Results for the proton and neutron removal reactions from Ca-56 to states in K-55 and Ca-55 for the level energies, excited state lifetimes, and exclusive cross sections agree well with state-of-the-art theoretical calculations using different approaches. The observation of a short- lived state in Ca-57 suggests a transition in the calcium isotopic chain from single-particle dominated states at N = 35 to collective excitations at N = 37.

Item Type:	Article
Uncontrolled Keywords:	Radiactive beams ; gamma-ray spectroscopy ; shell evolution
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanja Szilner, Suzana IP-2013-11-7194 HRZZ Zemljovid atomskih jezgara - neutronski bogata strana Szilner, Suzana IP-2018-01-1257 HRZZ
Depositing User:	Igor Gašparić
Date Deposited:	05 Apr 2023 07:22
URI:	http://fulir.irb.hr/id/eprint/7856
DOI:	10.1016/j.physletb.2022.136953

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