Nuclear Spectroscopy ofBi210with Stripping Reactions

Abstract

Forty-four single neutron states are located in ${\mathrm{Bi}}^{210}$ with ${\mathrm{Bi}}^{209}(d, p)$ reactions. These are compared with the levels predicted from the $j-j$ coupling shell model. Of the ten levels predicted from a coupling of the $h_{\frac{9}{2}}$ proton and the $g_{\frac{9}{2}}$ neutron, nine are observed including the ground state. One of them is assumed to be composed of two close-lying levels, thus, accounting for all the ten levels. Proton angular distributions and total cross section for exciting these ten levels suggest that they have a very pure ${\left(h_{\frac{9}{2}}\right)}_p{\left(g_{\frac{9}{2}}\right)}_n$ configuration. A comparison of the relative cross sections for exciting these ten levels with the $2J+1$ statistical factor gives consistent spin values for these levels. Angular distributions of protons from several prominent groups in ${\mathrm{Bi}}^{209}(d, p)$ reactions are compared with those from ${\mathrm{Pb}}^{208}(d, p)$ reactions, identifying the ($d_{\frac{5}{2}}$), ($s_{\frac{1}{2}}$), and ($d_{\frac{3}{2}}$) neutron states in ${\mathrm{Bi}}^{210}$. Effect of configuration mixing is discussed. The level density above 2.5-MeV excitation is found to be small compared to the shell-model prediction.