Collective states in ${}_{}{}^{250}{}_{}{}^{}\mathrm{Cf}$ have been studied by inelastic deuteron scattering at 15 MeV. Deuterons scattered from a 10 μg/${\mathrm{cm}}^2$ ${}_{}{}^{250}{}_{}{}^{}\mathrm{Cf}$ target were momentum analyzed with an Enge split-pole magnetic spectrograph. Spectra were recorded at angles of 90°, 125°, and 140° with respect to the incident beam. The differential cross sections and angular distributions of inelastic deuteron groups confirm the assignments of the previously known $K\pi =2-$ state at 872 keV and the $K\pi =2+$ state at 1032 keV. Levels at 1211 and 1429 keV, which are strongly populated in the ($d$,$d^{\prime }$) reaction, are assigned as the 3—member of the $K\pi =1- \mathrm{and} 3-$ bands, respectively. Reduced transition probabilities $B\left(E2\mathrm{}\right)\mathrm{}$ and $B\left(E3\mathrm{}\right)\mathrm{}$ have been extracted for the 2+ and 3- level and are compared with the predictions of microscopic theories of vibrational states.

NUCLEAR REACTION ${}_{}{}^{250}{}_{}{}^{}\mathrm{Cf}$($d$,$d^{\prime }$), $E_d=15\mathrm{}$ MeV; measured $\sigma (E_d,\Theta )$. ${}_{}{}^{250}{}_{}{}^{}\mathrm{Cf}$ deduced levels, $J$, $K$, $\pi$, $B\left(E2\mathrm{}\right)\mathrm{}$, $B\left(E3\mathrm{}\right)\mathrm{}$. Mass-separated ${}_{}{}^{250}{}_{}{}^{}\mathrm{Cf}$ target.

• Received 1 November 1979

DOI:https://doi.org/10.1103/PhysRevC.21.874