New information on excited states below the μs isomer in Sb136

New experimental information has been obtained on the mu s isomeric cascade in the very neutron-rich Sb-136 using gamma-ray and conversion-electron spectroscopy at the Lohengrin mass spectrometer of the Institut Laue-Langevin. Two new transitions have been observed and their multipolarities determined, resolving the question of the origin of the isomerism. The new level scheme is in good agreement with predictions of a realistic shell-model calculation. The isomeric state is tentatively assigned a spin and parity of 6(-) and a proposed pi g(7/2)nu(f(7/2))(3) dominant configuration.