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Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes

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Title
Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes
Author(s)
Li, P.J.; Lee, J.; Doornenbal, P.; Chen, S.; Wang, S.; Obertelli, A.; Chazono, Y.; Holt, J.D.; Hu, B.S.; Ogata, K.; Utsuno, Y.; Yoshida, K.; Achouri, N.L.; Baba, H.; Browne, F.; 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.; 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; Kahlbow, J.; Da Hee Kim; Koiwai, T.; Kondo, Y.; Körper, D.; Koseoglou, P.; Lehr, C.; Linh, B.D.; Lokotko, T.; MacCormick, M.; Miki, K.; Moschner, K.; Nakamura, T.; S.Y. Park; Rossi, D.; Sahin, E.; Schindler, F.; Simon, H.; Söderström, P.-A.; Sohler, D.; Takeuchi, S.; Toernqvist, H.; Tscheuschner, J.; Vaquero, V.; Wagner, V.; Werner, V.; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L.
Publication Date
2024-08
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v.855
Publisher
Elsevier BV
Abstract
The calcium isotopes are an ideal system to investigate the evolution of shell structure and magic numbers. Although the properties of surface nucleons in calcium have been well studied, probing the structure of deeply bound nucleons remains a challenge. Here, we report on the first measurement of unbound states in 53Ca and 55Ca, populated from 54,56Ca(p,pn) reactions at a beam energy of around 216 MeV/nucleon at the RIKEN Radioactive Isotopes Beam Factory. The resonance properties, partial cross sections, and momentum distributions of these unbound states were analyzed. Orbital angular momentum l assignments were extracted from momentum distributions based on calculations using the distorted wave impulse approximation (DWIA) reaction model. The resonances at excitation energies of 5516(41) keV in 53Ca and 6000(250) keV in 55Ca indicate a significant l = 3 component, providing the first experimental evidence for the ν0f7/2 single-particle strength of unbound hole states in the neutron-rich Ca isotopes. The observed excitation energies and cross-sections point towards extremely localized and well separated strength distributions, with some fragmentation for the ν0f7/2 orbital in 55Ca. These results are in good agreement with predictions from shell-model calculations using the effective GXPF1Bs interaction and ab initio calculations and diverge markedly from the experimental distributions in the nickel isotones at Z=28. © 2024 The Author(s)
URI
https://pr.ibs.re.kr/handle/8788114/15749
DOI
10.1016/j.physletb.2024.138828
ISSN
0370-2693
Appears in Collections:
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
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