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Browne, F.; Chen, S.; Doornenbal, P.; Obertelli, A.; Ogata, K.; Utsuno, Y.; Yoshida, K.; Achouri, N. L.; Baba, H.; Calvet, D.; Château, F.; 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.; Wimmer, K.; Yoneda, K.; Aktas, O.; Aumann, T.; Boretzky, K.; Caesar, C.; Chung, L. X.; Flavigny, F.; Franchoo, S.; Gasparic, I.; Gerst, R.-B.; Gibelin, J.; Hahn, K. I.; Holl, M.; Kahlbow, J.; Kim, D.; Körper, D.; Koiwai, T.; Kondo, Y.; Koseoglou, P.; Lee, J.; Lehr, C.; Linh, B. D.; Lokotko, T.; MacCormick, M.; Miki, K.; Moschner, K.; Nakamura, T.; Park, S. Y.; Rossi, D.; Sahin, E.; Schindler, F.; Simon, H.; Söderström, P-A.; Sohler, D.; Takeuchi, S.; Törnqvist, H.; Tscheuschner, J.; Vaquero, V.; Wagner, V.; Wang, S.; Werner, V.; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L.
Physical review letters, 06/2021, Letnik: 126, Številka: 25Journal Article
Direct proton-knockout reactions of Sc-55 at similar to 220 MeV/nucleon were studied at the RIKEN Radioactive Isotope Beam Factory. Populated states of Ca-54 were investigated through -ray and invariant-mass spectroscopy. Level energies were calculated from the nuclear shell model employing a phenomenological intemucleon interaction. Theoretical cross sections to states were calculated from distorted-wave impulse approximation estimates multiplied by the shell model spectroscopic factors, which describe the wave function overlap of the Sc-55 ground state with states in Ca-54. Despite the calculations showing a significant amplitude of excited neutron configurations in the ground-state of Sc-55, valence proton removals populated predominantly the ground state of Ca-54. This counterintuitive result is attributed to pairing effects leading to a dominance of the ground-state spectroscopic factor. Owing to the ubiquity of the pairing interaction, this argument should be generally applicable to direct knockout reactions from odd-even to even-even nuclei.
