Inner-Core Neutron-Hole State1h112in Odd Nd and Sm Isotopes

Almost all of the single-particle strength of the neutron-hole state $1{h_{\frac{11}{2}}}^{-1\mathrm{}}$ in ${}_{}{}^{145,147}{}_{}{}^{}\mathrm{Nd}$ and ${}_{}{}^{147,149,151,153}{}_{}{}^{}\mathrm{Sm}$ has been observed by using the preferential population to the high-spin states of the (${}_{}{}^3{}_{}{}^{}\mathrm{He}$, $\alpha$) reaction at 82 MeV. The strength distribution in the $\alpha$-particle spectra suggests that the $1{h_{\frac{11}{2}}}^{-1\mathrm{}}$ state in these nuclei is split into the Nilsson orbitals as a result of deformation. The deformation parameters obtained are consistent with those of the adjacent even-even nuclei, except in the $N=85\mathrm{}$ isotones.