Radioactive ion beams of 17F were used to study several resonance states in 18Ne. Clear evidence for simultaneous two-proton emission from the 6.15 MeV state (Jpi = 1(-)) in 18Ne has been observed with the reaction 17F+1H. Because of limited angular coverage, the data did not differentiate between the two possible mechanisms of simultaneous decay, diproton (2He) emission or direct three-body decay. The two-proton partial width was found to be 21+/-3 eV assuming 2He emission and 57+/-6 eV assuming three-body decay. The total width of the 1(-) state was measured to be 50+/-5 keV. Several additional resonances that decay by single proton emission were also studied.

Alpha-gamma coincidence measurements have been made with reactions of 142-MeV 16 0 on 14e Nd leading to the noncollective nuclei 152 Dy and 151 Dy. The side-feeding pattern in coincidence with forward energetic alpha particles peaks at J = 30 with full width at half maximum ~10, indicating that central collisions do not participate, while that for backward alpha particles extends down to J = 0. The data are consistent with the generalized critical-angular-momentum model of incomplete fusion.

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log resonances and in the fission process.We thank H. Paetz gen<, Schieck for his permanent help in running the Universitat Koln polarized ion source even if only for an unpolarized beam.The measured correlation of charged-particle energies and angles with y-ray multiplicities indicate that the average angular momentum transferred in the capture of 4 He, 8 Be, and 12 C from 153-MeV 16 0 projectiles by a 154 Sm target increases linearly with captured mass. These incomplete-fusion processes are shown to originate from undamped peripheral collisions.