Abstract

Single-particle properties of low-lying resonance levels in 14O have been studied efficiently by utilizing a technique of proton elastic resonance scattering with a 13N secondary beam and a thick proton target. The excitation functions for the N13+p elastic scattering were measured over a wide energy range of ECM=0.4–3.3 MeV and fitted with an R-matrix calculation. A clear assignment of Jπ=2− has been made for the level at Ex=6.767(11) MeV in 14O for the first time. The excitation functions show a signature of a new 0− level at Ex=5.71(2) MeV with Γ=400(100) keV. The excitation energies and widths of the 14O levels are discussed in conjunction with the spectroscopic structure of A=14 nuclei with T=1.

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