(α,Li6) Reaction onC12,N14,Al27, and Ni at 42 MeV

Abstract

Angular distributions for the ${\mathrm{N}}^{14}(\alpha , {\mathrm{Li}}^6){\mathrm{C}}^{12}$ and ${\mathrm{C}}^{12}(\alpha , {\mathrm{Li}}^6){\mathrm{B}}^{10}$ reactions have been measured at a bombarding energy of 42 MeV. Assuming that these reactions proceed through the pickup of a deuteron cluster and that the plane-wave Born approximation is applicable, it is found that the reduced width for a deuteron cluster in the ground state of ${\mathrm{N}}^{14}$ is five times larger than that for the ${\mathrm{C}}^{12}$ ground state. Distorted-wave Born approximation calculations did not agree with experiment. The ($\alpha$, ${\mathrm{Li}}^6$) reaction was also observed with aluminum and nickel targets. Though the ($\alpha$, ${\mathrm{Li}}^7$) reaction contaminated the spectra and the experimental resolution was insufficient to separate discrete final states, it is clear that the ($\alpha$, ${\mathrm{Li}}^6$)-reaction cross sections for aluminum and nickel were smaller than that for nitrogen by at least a factor of 50 and 1000, respectively.