Direct and resonant capture observed in the 3H(τ,γ)6 Li reaction

A direct capture model is used to calculate the ³H(τ, γ)⁶ Li cross section. The result for the ground-state cross section is in very good agreement with the data. The calculation for the cross section for the first excited state is in good agreement with the shape and angular dependence of the measured cross section at lower energies. Above E_τ=10 MeV a large discrepancy indicates a non-direct contribution. This is interpreted as a resonance in the compound nucleus ⁶Li with a configuration other than ${}^3\text{He}\text{+}{}^3\text{H}$.