Peaks at excitations of 5.11, 6.02, 7.48, 8.90, 10.79, and 11.56 MeV were observed in spectra of ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ produced by 180° inelastic scattering of electrons at 40.5, 50.6, and 60.6 MeV. The transitions at 6.02 and 8.90 MeV appear to be $E2\mathrm{}$ and $M2\mathrm{}$ or $E2\mathrm{}$, respectively. There is evidence for $M1\mathrm{}$ transition strength to at least one level in the 11 MeV excitation region. The model-dependent radiative widths of the levels at 5.11 and 7.48 MeV were determined to be: ${\Gamma }_0\mathrm{}\left(M2\mathrm{}\right)=(6.9\mathrm{}\pm 1.4)\times {10}^{-4\mathrm{}}$ eV and ${\Gamma }_0\mathrm{}\left(M1\mathrm{}\right)=11.3\mathrm{}\pm 2.0$ eV, respectively. Subject to qualifications cited in the text, radiative widths for some of the other transitions are also given.

NUCLEAR REACTIONS ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}(e,e^{\prime })$, $E=40-61\mathrm{}$ MeV, $\theta =180\mathrm{}°$. Measured $\sigma \mathrm{}\left(E\right)\mathrm{}$; deduced ${\Gamma }_0$ multipolarities for transitions excited.

• Received 2 August 1976

DOI:https://doi.org/10.1103/PhysRevC.14.1727