Hindered (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">Δ</mml:mi><mml:mi mathvariant="italic">l</mml:mi><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>0</mml:mn><mml:mn/></mml:math>) Alpha Decay and Shape Staggering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi/></mml:mrow><mml:mrow><mml:mn>191</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi>Po</mml:mi></mml:math>

Two $\ensuremath{\alpha}$-decaying isomeric states were observed in ${}^{191}\mathrm{Po}$ with ${E}_{\ensuremath{\alpha}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}7334(10)\mathrm{keV}$ and $\mathrm{T}{}_{1/2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}22(1)\mathrm{ms}$ for ${}^{191g}\mathrm{Po}$ and $\mathrm{E}{}_{\ensuremath{\alpha}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}7378(10)\mathrm{keV}$ and $\mathrm{T}{}_{1/2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}98(8)\mathrm{ms}$ for ${}^{191m}\mathrm{Po}$. Evidence was found for fine-structure decay to excited levels in the ${}^{187}\mathrm{Pb}$ daughter nucleus. The tentative interpretation of these new levels involves the weak coupling of the odd neutron to an intruder $\ensuremath{\pi}(2p\ensuremath{-}2h)$ deformed ${0}^{+}$ state in the even-even core. The long half-life of the ${}^{191m}\mathrm{Po}$ $(\ensuremath{\Delta}l\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0)$ $\ensuremath{\alpha}$ decay points to a deformed ${13/2}^{+}$ isomeric state in ${}^{191}\mathrm{Po}$.

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