First Observation of Unbound O11, the Mirror of the Halo Nucleus Li11

T. B. Webb et al.
Phys. Rev. Lett. 122, 122501 – Published 29 March 2019

Abstract

The structure of the extremely proton-rich nucleus O8113, the mirror of the two-neutron halo nucleus Li3118, has been studied experimentally for the first time. Following two-neutron knockout reactions with a O13 beam, the O11 decay products were detected after two-proton emission and used to construct an invariant-mass spectrum. A broad peak of width 3.4MeV was observed. Within the Gamow coupled-channel approach, it was concluded that this peak is a multiplet with contributions from the four lowest O11 resonant states: Jπ=3/21, 3/22, 5/21+, and 5/22+. The widths and configurations of these states show strong, nonmonotonic dependencies on the depth of the p-C9 potential. This unusual behavior is due to the presence of a broad threshold resonant state in N10, which is an analog of the virtual state in Li10 in the presence of the Coulomb potential. After optimizing the model to the data, only a moderate isospin asymmetry between ground states of O11 and Li11 was found.

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  • Received 20 December 2018
  • Revised 23 February 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.122501

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 122, Iss. 12 — 29 March 2019

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