The thick target yield of the reaction ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(t, \alpha )$ has been measured to the ground and first excited states of ${}_{}{}^6{}_{}{}^{}\mathrm{He}$ for bombarding energies between 70 and 110 keV. These yields are used to deduce the reaction cross sections and astrophysical $S$ factors at intermediate values of energy. The zero energy $S$ factor $S\left(0\right)\mathrm{}$ for ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(t, \alpha ){}_{}{}^6{}_{}{}^{}\mathrm{He}_{}^{*}{}_{}{}^{}\mathrm{}\left(1.81\right)\mathrm{}$ is 14±2.5 MeVb. Applications of the measured values of the cross section for this reaction to the diagnostics of high temperature tritium plasmas are discussed. Efforts to detect alphas from induced reactions on other light targets ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$, and ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ are discussed.

NUCLEAR REACTIONS ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(t, \alpha ){}_{}{}^6{}_{}{}^{}\mathrm{He}$, ${}_{}{}^9{}_{}{}^{}\mathrm{Be}(t, \alpha ){}_{}{}^8{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}(t, \alpha ){}_{}{}^{10}{}_{}{}^{}\mathrm{Be}$; $E_t=70-110\mathrm{}$ keV, $\theta =150\mathrm{}°$. Measured thick target yields. Deduced $\sigma (\theta , E)$, $S(\theta , E)$.

• Received 26 August 1982

DOI:https://doi.org/10.1103/PhysRevC.27.6