The continuous x-ray spectrum from the NRL betatron was used to excite and study the 4.46-Mev and the 5.03-Mev states in ${\mathrm{B}}^{11}$. The self-indication technique that was employed yielded the following values for the resonance integrals: ${\sigma }_0\Gamma =(0.79\mathrm{}\pm 0.21)\times {10}^{-4\mathrm{}}$ Mev-barn for the lower state and (0.98±0.17)×${10}^{-4\mathrm{}}$ Mev-barn for the upper state.

• Received 26 November 1958

DOI:https://doi.org/10.1103/PhysRev.114.590