First 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 ²⁶³106 was produced at the Lawrence Berkeley Laboratory 88-Inch Cyclotron via the ²⁴⁹Cf(¹⁸O,4n)²⁶³106 reaction using a beam of 95-MeV ¹⁸O ions. Positive identification of ²⁶³106 was made by observing its α decay followed closely in time by the α decay of the ²⁵⁹Rf daughter. Our rotating wheel system was used in a special parent-daughter mode with six pairs of detectors. The ²⁶³106 half-life, α-decay energy, and production cross section are consistent with those measured by Ghiorso et al. The half-life and α-decay energies of the ²⁵⁹Rf daughter events are also consistent with those previously published.