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The spectra of 20Na and 20F obtained by charge exchange reactions on 20Ne are compared; differences are seen close to the respective break-up thresholds. The excitation energies of 16 levels in 20Na have been obtained and spins assigned from DWBA calculations are compared with predictions of the shell model. In 20F, a strongly excited state is seen at 6.75 MeV, but the intruder state at 3.17 MeV is very weak.

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W h a t m e Laboratory. King's College. London WCZR 2LS. UK Received 4 May 1993 AbslracL Differential cmss seaions are presented for the analogue charge exchange maim wNe(3He~t~aNaand'oNe(~~He)ZoFat an incident energy of 33.4 MeV. Theangulardisuibutions are very similar for states of the same spin-parity assignment. On this basis, the analogue of the 2646keV stale in wNa is identsed with the 2966keV state (3") in "F.

A b s h d . Fusiodfission cross sections and T,,(fis) analysing powers together with angular distributions of quasi-elastic cross sections and T, (qel) are reported for the interaction of an aligned zG beam with a ' "Ba target at 143, 152, 164 and 174 MeV incident beam energies. The alignment dependent partial wave distributions for fusion. obtained from the analysis of the quasi-elastic data, were used as input for a statistical model calculation of the fission cross section and analysing power.NUCLEAR REACTIONS "' Ba ( G , Z 3 N a ) and ""Ba(*'<, fission) E(*Na) = 143, 152, 164 and 174 MeV; measured do/dQ(quasi-elastic), do/dQ(fission), T,o(quasi-elastic) and T,(fiasinn) hetween 20" and 70".