Widths ofB11levels below 9.0 MeV

The widths of nine energy levels in ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ at 2.125, 4.445, 5.021, 6.743, 6.793, 7.286, 7.978, 8.559, and 8.920 MeV were determined by carrying out self-absorption and photon scattering measurements. The temperature variation of the scattering cross section was measured at $T=298\mathrm{}$ K and $T=730\mathrm{}$ K to study in some detail the effective temperature $T_e$ of ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ in ${\mathrm{B}}_4$C, BN, and elemental B. The influence of $T_e$ on the deduced values of the radiative widths of ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ is discussed.