Effect of Woods-Saxon Wave Functions on Cross Sections for Charged-Pion Photoproduction fromO16

The cross sections for charged-pion photoproduction from ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($0^{+}$, g.s.) leading to the four low-lying bound states $J^P=2^{-}, 0^{-}, 3^{-}, 1^{-}$; $T=1\mathrm{}$ in ${}_{}{}^{16}{}_{}{}^{}\mathrm{N}$ are calculated in the Woods-Saxon basis. Two-particle-two-hole correlations in the ground-state wave function of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ are taken into account. Calculations in the Woods-Saxon basis yield more realistic results for the cross sections near the first pion-nucleon resonance region, where high momentum transfers occur, than those obtained in the conventional harmonic-oscillator basis.