Abstract
The nuclei 131 I and 133 I have been populated in multi-nucleon transfer reactions between 136 Xe ions and various targets, and their structure investigated by time-correlated γ-ray coincidence spectroscopy and the measurement of γ-ray angular correlations. A 19/2- isomer at 1918 keV, with a half-life of 24(1) µs, has been identified in 131 I , as well as nanosecond isomers with Jπ = 23/2+ in both isotopes. A T1/2 = 25(3) ns isomer at 4308 keV in 131 I is suggested to have Jπ = (31/2-, 33/2-) and is primarily attributed to the coupling of an odd proton in the d5/2 or g7/2 orbit with the [Formula: see text] configuration in 130 Te , responsible for the 15- isomer in that nucleus. The observed level properties are compared with predictions of a shell-model calculation.
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