• Letter

Complete set of bound negative-parity states in the neutron-rich nucleus N18

S. Ziliani et al.
Phys. Rev. C 104, L041301 – Published 11 October 2021

Abstract

High-resolution γ-ray spectroscopy of N18 is performed with the Advanced GAmma Tracking Array, following deep-inelastic processes induced by an O18 beam on a Ta181 target. Six states are newly identified, which together with the three known excitations exhaust all negative-parity excited states expected in N18 below the neutron threshold. Spin and parities are proposed for all located states on the basis of decay branchings and comparison with large-scale shell-model calculations performed in the p-sd space, with the YSOX interaction. Of particular interest is the location of the 01 and 12 excitations, which provide strong constrains for cross-shell p-sd matrix elements based on realistic interactions and help to simultaneously reproduce the ground and first-excited states in N16 and N18, for the first time. Understanding the N18 structure may also have significant impact on neutron-capture cross-section calculations in r-process modeling including light neutron-rich nuclei.

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  • Received 22 April 2021
  • Revised 2 August 2021
  • Accepted 7 September 2021

DOI:https://doi.org/10.1103/PhysRevC.104.L041301

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 104, Iss. 4 — October 2021

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