Successive pickup contributions to theMo98(d,α)Nb96reaction

The mechanism for ($(d,\alpha )$) reactions is discussed, with special attention given to the ${}_{}{}^{98}{}_{}{}^{}\mathrm{Mo}(d,\alpha ){}_{}{}^{96}{}_{}{}^{}\mathrm{Nb}$ reaction leading to the presumed [${\left(g_{\frac{9}{2}}\right)}_p\left(d_{\frac{5}{2}}\right)_{}^{-1\mathrm{}}{}_n{}^{}$] multiplet in ${}_{}{}^{96}{}_{}{}^{}\mathrm{Nb}$. The analysis relies on the coupled-reaction-channel approach for including contributions from the successive pickup processes $\mathrm{}(d,t)\mathrm{}-(t,\alpha )$ and $(d,{}_{}{}^3{}_{}{}^{}\mathrm{He})-({}_{}{}^3{}_{}{}^{}\mathrm{He},\alpha )$. An excellent description of both the shape and magnitude of the available data is possible with adjustment of only a single parameter, namely the effective strength $D_0$ of the direct plus nonorthogonality terms in the reaction amplitude. The effective direct term dominates for low-spin final states of unnatural parity, while the $\mathrm{}(d,t)\mathrm{}-(t,\alpha )$ term dominates for high-spin final states of natural parity. Extension of the results to the ${}_{}{}^{92}{}_{}{}^{}\mathrm{Mo}(d,\alpha ){}_{}{}^{90}{}_{}{}^{}\mathrm{Nb}$ reaction is also discussed.