Spin Assignments of theB120.95-, 1.67-, and 2.62-MeV Levels

Abstract

$\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ angular correlations were performed on the ${\mathrm{B}}^{12}$ 1.67 \ensuremath{\rightarrow} 0.95 \ensuremath{\rightarrow} 0 and 2.62 \ensuremath{\rightarrow} 0.95 \ensuremath{\rightarrow} 0 cascades following formation of the initial states via the ${\mathrm{B}}^{11}(d, p){\mathrm{B}}^{12}$ reaction. Deuteron energies of 1.70 and 3.13 MeV, respectively, were used. The results, when combined with previous information, lead to spin-parity assignments of ${2}^{+}$, ${2}^{\ensuremath{-}}$, and ${1}^{\ensuremath{-}}$ for the ${\mathrm{B}}^{12}$ 0.95-, 1.67-, and 2.62-MeV levels. Some information on the $\ensuremath{\gamma}$-ray decay modes of these states was obtained. This information is in good accord with previously reported work. ${\mathrm{B}}^{11}$+$d$ yield curves were obtained for the production of 0.95- and 1.67-MeV $\ensuremath{\gamma}$ rays and for the coincidence rate between these two $\ensuremath{\gamma}$ rays for deuteron energies between 0.55 and 3.05 MeV. Yield curves for production of the ${\mathrm{B}}^{12}$ 0.95-, 1.67-, and 2.62-MeV levels were constructed from these $\ensuremath{\gamma}$-ray yield curves.