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Pairing Forces Govern Population of Doubly Magic Ca-54 from Direct Reactions

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Title
Pairing Forces Govern Population of Doubly Magic Ca-54 from Direct Reactions
Author(s)
Browne, F.; Chen, S.; Doornenbal, P.; Obertelli, A.; Ogata, K.; Utsuno, Y.; Yoshida, K.; Achouri, N. L.; Baba, H.; Calvet, D.; Chateau, F.; Chiga, N.; Corsi, A.; Cortes, 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.; Laszlo, Stuhl; 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.; Kevin Insik, Hahn; Holl, M.; Kahlbow, J.; KIM, Da Hee; Korper, D.; Koiwai, T.; Kondo, Y.; Koseoglou, P.; Lee, J.; Lehr, C.; Linh, B. D.; Lokotko, T.; MacCormick, M.; Miki, K.; Moschner, K.; Nakamura, T.; Su Yeon, Park; Rossi, D.; Sahin, E.; Schindler, F.; Simon, H.; Soderstrom, P-A; Sohler, D.; Takeuchi, S.; Tornqvist, H.; Tscheuschner, J.; Vaquero, V.; Wagner, V; Wang, S.; Werner, V; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L.
Publication Date
2021-06
Journal
PHYSICAL REVIEW LETTERS, v.126, no.25
Publisher
AMER PHYSICAL SOC
Abstract
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.
URI
https://pr.ibs.re.kr/handle/8788114/10157
DOI
10.1103/PhysRevLett.126.252501
ISSN
0031-9007
Appears in Collections:
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
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