The energy levels of 14O and 18Ne from ( 3He, n) reactions

Abstract

A neutron time-of-flight spectrometer has been used to measure angular distributions and excitation functions for the reactions 12C( 3He, n) 14O and 16O( 3He, n) 18Ne at 3He energies between 9 and 10.6 MeV. The results indicate a direct reaction mechanism, and good agreement is obtained with angular distributions from DWBA double stripping calculations. These comparisons indicate the following energy-level spins and parities: 14O ground state 0 +, 5.15 MeV 1 − or 0 +, 5.91 MeV 0 +(1 −) and 6.30 MeV (3 −); 18Ne ground state 0 +, 1.88 MeV 2 +, 3.36 MeV (4 +) and 3.61 MeV 2 +. A new level was observed in 18Ne at 4.59±0.03 MeV. The level schemes are compared with those of the mirror nuclei 14C and 18O.