Beta-Decay Half-Lives of Isotopes Produced in Projectile Fragmentation

Abstract

Beta-decay half-lives have been measured for eight neutron-rich isotopes produced in the fragmentation of 11.4-GeV ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ on ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$. The experiment used a new measurement technique designed to observe very short half-lives. The previously unknown half-lives of ${}_{}{}^{22}{}_{}{}^{}\mathrm{O}$ (910 ± 350 ms) and ${}_{}{}^{32}{}_{}{}^{}\mathrm{Al}$ (35 ± 5 ms) have been obtained, as well as six known half-lives to provide a check of the procedure.