E0 transitions andO+levels inXe136

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Abstract
The β− decay of I136 isomers to levels in Xe136 was studied using sources isolated at the on-line mass separator TRISTAN. Conversion-electron and gamma-ray singles data have been collected. Evidence for excited O+ states at 2582.4 and 4320 keV has been obtained. A shell-model study elucidating the salient features related to the first excited O+ state in the N=82 nuclei has been carried out. Comparing two-particle, four-particle exact shell-model and two-quasiparticle shell-model calculations using both a Gaussian and surface-delta interaction in the latter case, an explanation could be given for the Z dependence in the Ex(O2+) excitation energy. We also calculate the E0 reduced matrix elements for Te134.