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Restoration of the natural E(1/21 +) - E(3/21 +) energy splitting in odd-K isotopes towards N = 40

AuthorsSun, 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.; Vaquero, Victor
Shell evolution
Issue Date10-Mar-2020
PublisherElsevier BV
CitationPhysics Letters B 802: 135215 (2020)
AbstractWe report on the first γ-ray spectroscopy of K produced via the Ca(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 K were established quantifying the natural ordering of the 1d and 2s 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(1/2 ) - E(3/2 ) energy differences towards N = 40.
Description7 pags., 3 figs., 1 tab.
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2020.135215
Identifiersdoi: 10.1016/j.physletb.2020.135215
issn: 0370-2693
Appears in Collections:(CFMAC-IEM) Artículos
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