Measurement of the g-factor and lifetime of the first-excited state of 20O

Abstract

The g-factor and mean lifetime of the first-excited 2+ state at 1.67 MeV in 20O have been determined by means of a plunger set-up. The state was populated by the 3H(18O, pγ)20O reaction at E(18O) = 24.5 MeV. The analysis of p-γ anisotropies as a function of flight path of the recoiling ion in vacuum leads to a value for the g-factor of |g| = 0.352±0.015 and to a mean life of τ = 10.7±0.4 ps.