New Levels in²³Ne

Abstract

The 22Ne(d,pγ)23Ne-reaction has been studied using particle-gamma and gamma-gamma coincidence techniques. An annular, surface barrier detector and Ge(Li)-detectors were used together with multi-dimensional storage of data in a PDP-15 on-line computer. Energies and gamma radiation branching ratios of levels in 23Ne up to 4.0 MeV have been measured. New levels at 3 458.2 ± 0.6 keV, 3 830.5 ± 1.2 keV, 3 843.3 ± 1.1 keV and 4 010 ± 3 keV are suggested. All levels up to 4 MeV have been accounted for by the Nilsson model by including Coriolis mixing and by assuming that the nucleus is not deformed in the 2 s 1/2-state at 1 017 keV. Gamma radiation branching ratios are discussed. The experimental results are also compared with recent shell model calculations.