The reactions 22Ne(α,nγ)25Mg and 24Mg(d,pγ)25Mg have been studied at E
α = 10 MeV and E
d = 4.7 MeV using particle-gamma and gamma-gamma coincidence technique. Energies and gamma radiation branching ratios of levels in 25Mg up to 6 MeV have been obtained.
A versatile facility for studying nuclear reaction has been built. The 20Ne-(d,pγ)21Ne reaction has been studied using particle-gamma and gamma-gamma coincidence technique. Surface barrier solid state detectors and Ge(Li)-detectors were used together with a multi-dimensional storage of data in a PDP-15 on-line computer. Energies and gamma radiation branching ratios of levels in 21Ne up to 4.7 MeV have been measured. Levels in 21Ne are discussed in terms of modern shell model calculations and the Nilsson strong-coupling model.
The 22Ne(d,nγ)23Na reaction has been used to study the γ-ray deexcitation of 1/2+ levels in 23Na. New branches were found for the T = 3/2 level at 8.66 MeV. The experimental ΔT = 1, γ-ray transition strengths for this level cannot be explained by simple shell model theory but agree very well with those predicted by the collective model using Nilsson wavefunctions.
The decay of 23Ne to levels in 23Na has been studied by measuring the gamma radiation following the β-decay of the 23Ne nuclei produced in the 22Ne(d,p)23Ne reaction. New levels in 23Na reported by Lancman et al. could not be confirmed. The ft-values have been calculated using the Nilsson model and mixed states from Rotation Particle Coupling calculations including pairing effects in the matrix element. Reasonable agreement with the experimental result is obtained.
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