1ST CONFIRMATION OF THE DISCOVERY OF ELEMENT-106

We have confirmed the 1974 report of the discovery of element 106 by Ghiorso et al. The 0.9-s (263)106 was produced at the Lawrence Berkeley Laboratory 88-Inch Cyclotron via the Cf-249(O-18, 4n)(263)106 reaction using a beam of 95-MeV O-18 ions. Positive identification of (263)106 was made by observing its a decay followed closely in time by the a decay of the 259Rf daughter. Our rotating wheel system was used in a special parent-daughter mode with six pairs of detectors. The (263)106 half-life, a-decay energy, and production cross section are consistent with those measured by Ghiorso el al. The half-life and a-decay energies of the 259Rf daughter events are also consistent with those previously published.