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The three-body decay ' 0~2p + 'OC was studied following production via single-neutron stripping from a radioactive "0 projectile. This is the first observation of two-proton emission from an unbound ground state where the one-proton emission channel is energetically closed beyond the lightest case of Be. No evidence for He emission is seen, despite predictions for a large diproton branching ratio. An upper limit of 7% (95% C.L. ) is established for this decay branch. The implications of the small diproton branching ratio observed here and seen previously in Be are discussed.PACS numbers: 2~.50.+z, 25.60.+v, 27.20.+n Over 30 years ago Goldanskii predicted the existence of ground-state two-proton (2p) radioactivity in particle unbound (proton-rich) even-Z nuclei where the pairing energy between the last two protons causes the one-proton

The decay structure of the particle-unstable nucleus 10 Li was studied using the method of sequential neutron decay spectroscopy ͑SNDS͒ at 0°. The decay energies of 10 Li can be derived from the relative velocity spectrum of the 9 Li daughter and the neutron measured in coincidence. Evidence for low-lying s-wave strength was observed with a scattering length of ϽϪ20 fm, corresponding to a peak energy of Ͻ50 keV. ͓S0556-2813͑99͒06201-9͔

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High energy g rays from the decay of the giant resonance in hot 120 Sn nuclei were measured in the excitation energy range of 30-130 MeV. The excited nuclei were populated by inelastic scattering of a particles at 40 and 50 MeV͞nucleon. The resonance width was observed to increase monotonically with increasing excitation energy, from 5 MeV at the ground state to ϳ12 MeV at the largest excitation energy. Inelastic scattering predominantly populates low angular momentum states, and the observed width increase is thus attributed to fluctuations in the nuclear shape induced by temperature.