Excited states of111I and the observation of a 21 ns isomer

Proton rich nuclei close to¹⁰⁰Sn have been investigated inbeam using the NORDBALL detector array. A beam of 270 MeV⁵⁸Ni was used to bombard a⁵⁴Fe target. Reaction channel separation was achieved with a 4 charged particle multi-detector set-up together with a 1 neutron detector wall placed in the forward direction. Gamma-ray transitions belonging to the¹¹¹I nucleus were identified for the first time. A level scheme constructed from --particle-coincidence analysis is proposed. The level structure is discussed within the framework of the shell model and the systematics of the heavier odd iodine nuclei.