Half-life of 14 O

We have measured the half-life of 14 O, a superallowed (0 + ! 0 + ) � decay isotope. The 14 O was produced by the 12 C( 3 He,n) 14 O reaction using a carbon aerogel target. A low-energy ion beam of 14 O was mass separated and implanted in a thin beryllium foil. The beta particles were counted with plastic scintillator detectors. We find �1/2 = 70.696 ± 0.037 s. This result is 2.0� higher than an average value from six earlier experiments, but agrees more closely with the most recent previous measurment.