Total Spin Measurement of Proton Hole States by the (t, α) Reaction

It is shown that it is possible to measure the total angular momentum of proton hole states by means of the ($t, \alpha$) reaction using a recently developed polarized triton source. The reactions ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}(t, \alpha ){}_{}{}^{89}{}_{}{}^{}\mathrm{Y}$ and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}(t, \alpha ){}_{}{}^{207}{}_{}{}^{}\mathrm{Tl}$ have been studied at 17-MeV bombarding energies and show large differences in the analyzing powers between spin-orbit partners $p_{\frac{1}{2}}$ and $p_{\frac{3}{2}}$ in the former case and $d_{\frac{3}{2}}$ and $d_{\frac{5}{2}}$ in the latter case. It is concluded that measurement of asymmetries in ($t, \alpha$) reactions is a powerful technique to assign both $l$ and $j$ transfers for proton-pickup reactions.