The resonance in the 12C + t2C system at E .... = 19.3 MeV has been studied in the neutron and proton decay channels. From (p, 7), (n, p) and (n, 7) coincidence measurements high spin states could be localized in A--23 nuclei, in 23Mg up to possibly 21/2 +. These states were resonantly populated. The present data favor J~= 17/2 + for the 9.61 MeV state in 23Mg and therefore also for the probable parent state at 9.81 MeV in 23Na. A J~=12 + assignment to the resonance is supported and evidence was found that the resonant excitation of the lowest 15/2 + and 17/2 + states in mass 23 nuclei is caused by a change of the intrinsic structure of the Yrast levels around J~= 15/2 + towards larger deformation.

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