The behavior of the moment of inertia for high-spin states in ${\mathrm{Dy}}^{158}$ has been studied by populating the ground-state band up to spin 22 through the reaction ${\mathrm{Nd}}^{150}({\mathrm{C}}^{13}, 5N){\mathrm{Dy}}^{158}$ at bombarding energies of up to 72 MeV. The rate of increase of the moment of inertia $\mathcal{I}$ with rotational frequency rises abruptly in the region from spin 14 to 18. In the region of spin 22, $\mathcal{I}$ tends toward a more constant value.

• Received 29 February 1972

DOI:https://doi.org/10.1103/PhysRevLett.28.972