Abstract
New experimental information has been obtained on the \ensuremath{\mu}s isomeric cascade in the very neutron-rich $^{136}\mathrm{Sb}$ using \ensuremath{\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 ${6}^{\ensuremath{-}}$ and a proposed $\ensuremath{\pi}{g}_{7/2}\ensuremath{\nu}({f}_{7/2}){}^{3}$ dominant configuration.
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