Radiative pion capture in a liquid ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$${\mathrm{H}}_3$ target has been measured with a high-resolution photon detector. Evidence for $J^{\pi }={\frac{5}{2}}^{+}$, $T=\frac{3}{2}$ giant magnetic quadrupole states has been found. Results of a shell model calculation are given which represent the experimental spectrum satisfactorily. For the $J^{\pi }={\frac{5}{2}}^{+}$, $E^{*}\left({}_{}{}^{15}{}_{}{}^{}\mathrm{C}\right)=0.75\mathrm{}$ MeV level and the total spectrum the measured branching ratios are (9.6±2.4) × ${10}^{-4\mathrm{}}$ and (2.4±0.6) × ${10}^{-2\mathrm{}}$, respectively.

NUCLEAR REACTIONS ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}({\pi }^{-}, \gamma ){}_{}{}^{15}{}_{}{}^{}\mathrm{C}$, ($E_x<25\mathrm{}$ MeV), $E_{\pi }=0\mathrm{}$ MeV, measured photon spectra, pair spectrometer, compared with shell model calculations.

• Received 26 January 1983

DOI:https://doi.org/10.1103/PhysRevC.27.2771