C12(e, e′π+)Reaction Leading to Low-Lying States inB12

Energy and angular distributions of photopions from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, leading to low-lying residual states in ${}_{}{}^{12}{}_{}{}^{}\mathrm{B}$, have been measured via the ($e, e^{\prime }{\pi }^{+}$) reaction at $E_e=195\mathrm{}$ MeV. The shape of the patterns agrees with the theoretical estimates deduced from other electron scattering data and also with shell-model calculations. A comparison of the absolute value shows the importance of correct estimation of the pion wave. The result demonstrates that photopion experiments can provide a promising method for studying spin-flip-type electromagnetic transitions in nuclei.