On-line mass separator investigation of the new isotope 2.9-sec I116

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Using on-line mass separation I116 has been identified and its half-life determined to be 2.91 0.15 sec. The activity was produced by the Rh103(O16, 3n)I116 reaction and by the decay of 57-sec Xe116. The I116 decays primarily to the ground state of Te116 and also to excited states at 678.9 and 1219.1 keV. From positron measurements, a decay energy of QEC=7.710.20 MeV is assigned to I116. rays of 540.2 and 678.9 keV are observed in this decay and are assigned to depopulate levels in Te116 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 logft values, a spinparity assignment of 1+ is deduced for the ground state of I116, which is interpreted to have a configuration of [(d52)(d32)]. A decay energy of QEC=4.340.20 MeV observed from activity produced by the Pd104 + O16 reaction is assigned to Xe116. NUCLEAR REACTIONS Rh103(O16, 3n), E=83 MeV; Pd104(O16, 4n) and Pd104(O16,p 3n), E=91 MeV. Natural Rh targets and enriched Pd targets. RADIOACTIVITY I116, Xe116; measured E, I, T12(), T12(+), +- coin., + end point; Te116 deduced levels, J, , logft; I116 deduced ground state J, , logft; Ge(Li) detectors and plastic scintillators; mass separated sources. © 1976 The American Physical Society.

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Physical Review C

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