High spin states and isomers inDy151

High spin states and isomers in ${}_{}{}^{151}{}_{}{}^{}\mathrm{Dy}$ have been studied using the ${}_{}{}^{122}{}_{}{}^{}\mathrm{Sn}$(${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$,$3n$)${}_{}{}^{151}{}_{}{}^{}\mathrm{Dy}$ and ${}_{}{}^{141}{}_{}{}^{}\mathrm{Pr}$(${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$,$4n$)${}_{}{}^{151}{}_{}{}^{}\mathrm{Dy}$ reactions. Levels up to $J=\frac{53}{2}$ have been assigned, and two isomers at 4904 keV ($J=\frac{41}{2}$, ${\tau }_{\frac{1}{2}}=7\mathrm{}\pm 2$ ns) and 6032 keV ($J=\frac{49}{2}$, ${\tau }_{\frac{1}{2}}=10.9\mathrm{}\pm 0.6$ ns) have been identified. Gamma transitions de-exciting the isomers have $B\left(E2\mathrm{}\right)\mathrm{}$ values characteristic of single-particle transitions. The yrast sequence exhibits an irregular dependence on excitation energy characteristic of an independent particle model rather than a deformed rotor. In addition, above $J=\frac{25}{2}$ it exhibits an effective moment of inertia of 138 Me${\mathrm{V}}^{-1\mathrm{}}$ which is 1.18 times the rigid sphere value. These data are compared to recent spherical and deformed shell model predictions and a qualitative agreement is found between experiment and calculation.