Abstract
Transitions in the very neutron-deficient ${\mathrm{isotope}}^{186}$Pb have been identified in mass-gated, recoil-\ensuremath{\gamma}, and recoil-\ensuremath{\gamma}-\ensuremath{\gamma} coincidence data obtained with a fragment mass analyzer and Compton-suppressed Ge-detector array. The results of the present work confirm and extend a band of levels tentatively proposed in earlier work done elsewhere, and provide a definitive mass assignment of the observed transitions. The band observed in $^{186}\mathrm{Pb}$ bears a very close resemblance to the yrast band in the isotone $^{184}\mathrm{Hg}$, supporting the view that the $^{186}\mathrm{Pb}$ band is built upon a prolate structure.
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