On-line mass separator investigation of the new isotope 2.9-sec $sup 116$I

Using on-line mass separation $sup 116$I has been identified and its half-life determined to be 2.91 +- 0.15 sec. The activity was produced by the $sup 103$Rh($sup 16$O, 3n)$sup 116$I reaction and by the decay of 57-sec $sup 116$Xe. The $sup 116$I decays primarily to the ground state of $sup 116$Te and also to excited states at 678.9 and 1219.1 keV. From positron measurements, a decay energy of Q/sub E//sub C/ = 7.71 +- 0.20 MeV is assigned to $sup 116$I. $gamma$ rays of 540.2 and 678.9 keV are observed in this decay and are assigned to depopulate levels in $sup 116$Te at 1219.1 and 678.9 keV, respectively. The former is a new level with a probable spin-parity of either 2$sup +$ of 0$sup +$. From the logft values, a spin-parity assignment of 1$sup +$ is deduced for the ground state of $sup 116$I, which is interpreted to have a configuration of $pi$ (d$sub 5$/$sub 2$) $nu$ (d$sub 3$/$sub 2$). A decay energy of Q/sub E//sub C/ =4.34 +- 0.20 MeV observed from activity produced by the $sup 104$Pd + $sup 16$O reaction is assigned to $sup 116$Xe. (AIP)