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    Resonant structure of Na18 and the N=8 shell

    L. Ni1, Y. Jin1, Z. H. Li1,*, K. W. Brown2,3,†, H. Hua1,‡, C. Y. Niu2, A. K. Anthony2,4,§, J. Barney2,4, R. J. Charity5 et al.

    D. Dell'Aquila2,∥, J. M. Elson5, J. Estee2,4, G. Jhang2, J. G. Li6,7, W. G. Lynch2,4, N. Michel6,7, L. G. Sobotka5,8, S. Sweany2,4, F. C. E. Teh2,4, A. Thomas5, C. Y. Tsang2,4, M. B. Tsang2,4, S. M. Wang9,10, H. Y. Wu1, C. X. Yuan11, and K. Zhu2,4

    • *Contact author: zhli@pku.edu.cn
    • †Contact author: brownk@frib.msu.edu
    • ‡Contact author: hhua@pku.edu.cn
    • §Present address: Department of Physics and Astronomy, High Point University, High Point, NC 27268, USA.
    • ∥Present address: Department of Physics “Ettore Pancini”, University of Naples “Federico II” & INFN-Naples, Naples 80138, Italy.

    Phys. Rev. C 112, 024321 – Published 22 August, 2025

    DOI: https://doi.org/10.1103/vktj-1wkr

    Abstract

    The resonant structure of the proton-unbound nucleus Na18 has been studied via knockout reactions of a Mg20 beam on a Be9 target. Three resonant states in Na18 are identified through the invariant-mass reconstruction of Ne17+1p events, including the 11− ground state with one-proton decay energy of 1.38(2) MeV. In comparison with the low-lying states in the mirror neutron-rich nucleus N18, the 11− ground state and 21− excited state with π(1d5/2)3 ⊗ ν1p1/2 configurations in Na18 likely correspond to different proton seniorities, ν=3 and 1, respectively, while the 01− and 12− states with π(1d5/2)2(2s1/2) ⊗ ν1p1/2 configuration show obvious Thomas-Ehrman shifts. With the more-precise atomic mass of Na18, the one-neutron separation energy Sn(Na19)=20.31(2)MeV is derived. Based on the systematics of the differences in experimental one-neutron separation energy in the isotopic chains from Z=9 to 12, the shell effects at N=8 for proton-rich nuclei are discussed.

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