Excitation of States inPb207byPb208(d,t),Pb206(d,p), andPb207(d,d′)Reactions

Abstract

States up to 5.6 MeV in excitation energy in ${\mathrm{Pb}}^{207}$ were studied by the ${\mathrm{Pb}}^{208}\mathrm{}(d,t)\mathrm{}$, ${\mathrm{Pb}}^{206}\mathrm{}(d,p)\mathrm{}$, and ${\mathrm{Pb}}^{207}(d,d^{\prime })$ reactions at a deuteron bombarding energy of 17 MeV. Over 100 states were observed and 70 angular distributions were measured and compared with distorted-wave Born approximation calculations for the ($d,p$), and ($d,t$) reactions. Special emphasis was placed on obtaining accurate excitation energies to compare those states excited in more than one reaction. In ${\mathrm{Pb}}^{206}\mathrm{}(d,p)\mathrm{}$, some of the two-hole-one-particle (2h-1p) states are found to be fragmented. The $i_{\frac{11}{2}}$ and $j_{\frac{15}{2}}$ 2h-1p states are tentatively identified. Many of the weaker (less than 5 μb/sr) transitions in ($d,t$) have angular distributions which do not follow DWBA - possibly indicating other than one-step reaction mechanisms. Observation of the 2h-1p states in ($d,t$) indicate that the ${\mathrm{Pb}}^{208}$ closed shell contains about $4.7\% {\left(2\mathrm{}{g}_{\frac{9}{2}}\right)}^2$, $\lesssim 4.7\% {\left(3\mathrm{}{d}_{\frac{5}{2}}\right)}^2$, and $\lesssim 1.2\% {\left(4\mathrm{}{s}_{\frac{1}{2}}\right)}^2$ particle-${\mathrm{Pb}}^{206}$ core admixture.