Neutron occupancy of the 0d5/2 orbital and the N=16 shell closure in 24O

Abstract

One-neutron knockout from 24O leading to the first excited state in 23O has been measured for a proton target at a beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of 23O was reconstructed from the measured four momenta of the 22O fragment and emitted neutron. A sharp peak was found at Edecay=50$\pm$3 keV, corresponding to an excited state in 23O at 2.78$\pm$0.11 MeV, as observed in previous measurements. The longitudinal momentum distribution for this state was consistent with d -wave neutron knockout, providing support for a Jπ assignment of 5/2+. The associated spectroscopic factor was deduced to be C2S(0d5/2)=4.1$\pm$0.4 by comparing the measured cross section (View the MathML source) with a distorted wave impulse approximation calculation. Such a large occupancy for the neutron 0d5/2 orbital is in line with the N=16 shell closure in 24O.

arXiv commentPublished in Physics Letters B (18 October 2014)

References in corpus (9)

• Magic numbers in exotic nuclei and spin-isospin properties of {\it NN} interaction
• Three-body forces and the limit of oxygen isotopes
• Discrete and continuum spectra in the unified shell model approach
• One-neutron removal reactions on light neutron-rich nuclei
• The N = 16 spherical shell closure in 24O
• Quasi-free (p,2p) and (p,pn) reactions with unstable nuclei
• Pauli blocking and medium effects in nucleon knockout reactions
• Closed-shell properties of ${}^{24}$O with {\em ab initio} coupled-cluster theory
• One-neutron knockout reaction of 17C on a hydrogen target at 70 MeV/nucleon

Cited by in corpus (4)

• A three-body model for the analysis of quasi-free scattering reactions in inverse kinematics
• Single-neutron knockout from ${}^{20}\text{C}$ and the structure of ${}^{19}\text{C}$
• Two-Neutron Sequential Decay of ${}^{24}$O
• Low-lying single-particle structure of 17C and the N = 14 sub-shell closure