Decay spectroscopy of an isomeric state in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Md</mml:mi><mml:mprescripts/><mml:none/><mml:mn>251</mml:mn></mml:mmultiscripts></mml:math>

Excited states in $^{251}\mathrm{Md}$ have been populated by decay of an isomeric state at ${E}_{x}\ensuremath{\approx}1174$ keV and studied via delayed $\ensuremath{\gamma}$-ray spectroscopy. We observe the population of two rotational bands, one of which we identify as the Nilsson $\ensuremath{\pi}\frac{7}{2}[514]$ ground-state band and the other we propose is based on the $\ensuremath{\pi}\frac{9}{2}[624]$ configuration. From the observed decay pattern, we suggest that the isomer spin parity is ${\frac{23}{2}}^{+}$, with the three-quasiparticle configuration $\ensuremath{\pi}\frac{7}{2}[514]\ensuremath{\bigotimes}{{\ensuremath{\nu}\frac{7}{2}[624]\ensuremath{\bigotimes}\ensuremath{\nu}\frac{9}{2}[734]}}_{{K}^{\ensuremath{\pi}}={8}^{\ensuremath{-}}}$. We compare our results to theoretical predictions of the single- and multi-quasiparticle structure of $^{251}\mathrm{Md}$.