Levels of Bi209 Observed in the Pb208(He3, d) Reaction

Abstract

The level structure of ${\mathrm{Bi}}^{209}$ has been studied using the ${\mathrm{Pb}}^{208}({\mathrm{He}}^3, d){\mathrm{Bi}}^{209}$ reaction at 44.2 MeV. A distorted-wave-approximation analysis of angular distributions for the seven strong levels observed indicates that the following levels contain almost the full shell-model strength: g.s., $1h_{\frac{9}{2}}$; 0.90 MeV, $2f_{\frac{7}{2}}$; 1.61 MeV, $1i_{\frac{13}{2}}$; 2.83 MeV, $2f_{\frac{5}{2}}$; and 3.12 MeV, $3p_{\frac{3}{2}}$. The level at 3.64 MeV contains about two-thirds of the $3p_{\frac{1}{2}}$ strength. Our analysis did not provide a conclusive explanation for the level at 4.42 MeV. Angular distributions were also measured for three states weakly excited at 2.61, 4.52, and 4.58 MeV. A number of other states were weakly excited in the region between 3.4 and 4.4 MeV.