Collective Correlations in the Giant Dipole Continuum of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$

A continuum shell-model calculation based on the collective correlation model has been made for the giant resonance of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ using the eigenchannel reaction theory. The low-lying negative-parity states of ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ have been taken into account by corehole coupling. Partial, total, and integrated photoabsorption cross sections are calculated for the region of the giant dipole resonance.