Abstract
Gauge invariance and the partially conserved axial-vector current hypothesis are used in the soft-pion approximation for the processes γ + 11 B → 11 C + π − and γ + 16 O → 16 N + π − , where the final nuclei are in the ground state. The nuclei in the processes are treated as “elementary” particles, the nuclear form factors required being obtained from corresponding beta-decay and electron-scattering experiments. A sum rule is obtained for the total cross sections for the processes γ + 11 B → 11 C + π − and γ + 11 B → 11 Be + π + , final nuclei being in the ground or excited states. Comparison is made with previous theoretical calculations and experimental results.
Published Version
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