Using on-line mass separation I 116 has been identified and its half-life determined to be 2.91 ± 0.15 sec. The activity was produced by the Rh 103 ( O 16 , 3 n ) I 116 reaction and by the decay of 57-sec Xe 116 . The I 116 decays primarily to the ground state of Te 116 and also to excited states at 678.9 and 1219.1 keV. From positron measurements, a decay energy of Q EC = 7.71 ± 0.20 MeV is assigned to I 116 . γ rays of 540.2 and 678.9 keV are observed in this decay and are assigned to depopulate levels in Te 116 at 1219.1 and 678.9 keV, respectively. The former is a new level with a probable spin-parity of either 2 + or 0 + . From the log ft values, a spinparity assignment of 1 + is deduced for the ground state of I 116 , which is interpreted to have a configuration of π ( d 5 2 ) ν ( d 3 2 ) . A decay energy of Q EC = 4.34 ± 0.20 MeV observed from activity produced by the Pd 104 + O 16 reaction is assigned to Xe 116 . NUCLEAR REACTIONS Rh 103 ( O 16 , 3 n γ ) , E = 83 MeV; Pd 104 ( O 16 , 4 n γ ) and Pd 104 ( O 16 , p 3 n γ ) , E = 91 MeV. Natural Rh targets and enriched Pd targets. RADIOACTIVITY I 116 , Xe 116 ; measured E γ , I γ , T 1 2 ( γ ) , T 1 2 ( β + ) , β + - γ coin., β + end point; Te 116 deduced levels, J , π , log ft ; I 116 deduced ground state J , π , log ft ; Ge(Li) detectors and plastic scintillators; mass separated sources.
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