Width of the 2.186-MeV1−Level inNd144

The resonant scattering of $\gamma$ rays has been observed for the 2.186-MeV $1^{-}$ state in ${\mathrm{Nd}}^{144}$. The electron bremsstrahlung from a Van de Graaff accelerator served as the exciting $\gamma$ radiation. The scattered radiation was observed with a 40-${\mathrm{cm}}^3$ Ge(Li) detector. If the value $\frac{{\Gamma }_0}{\Gamma }=0.71\mathrm{}$ is used for the branching ratio, the measured scattering yield corresponds to a partial width ${\Gamma }_0=(3.1\mathrm{}\pm 0.4)\times {10}^{-2\mathrm{}}$ eV for the ground-state transition. The reduced $E1\mathrm{}$ transition probability for the ground-state transition is intermediate between the $B\left(E1\mathrm{}\right)\text{'}\mathrm{s}$ for the "spherical" nucleus ${\mathrm{Sm}}^{148}$ and the deformed nucleus ${\mathrm{Sm}}^{152}$. A level with spin 2 and with an excitation energy of 2.074 MeV has also been excited in ${\mathrm{Nd}}^{144}$. From the observed scattering, $\frac{{{\Gamma }_0}^2}{\Gamma }=(1.2\mathrm{}\pm 0.3)\times {10}^{-3\mathrm{}}$ eV is obtained for this level.