Abstract
The measurement of the giant electric dipole resonance built on the isobaric analog state in the self-conjugate even-even nucleus $^{12}\mathrm{C}$ is reported covering a wide excitation energy range. This is done using the $^{11}\mathrm{B}$($p,\ensuremath{\gamma}$) reaction leading to the 15.1 MeV $T=1$ state in $^{12}\mathrm{C}$ over a proton energy range of 7 to 24.5 MeV. Two resonances of 1.3 and 2 MeV widths are observed at excitation energies of 24.4 and 28.8 MeV superimposed on a smoothly varying cross section. The \ensuremath{\gamma} transitions from both the resonances are assigned $E1$ multipolarity. The structured $T=0$ component of the $E1$ strength distribution is thus very different from that built on the first $T=1$ state in the neighboring nucleus $^{14}\mathrm{N}$ and those built on the ground states of $^{12}\mathrm{C}$ and $^{14}\mathrm{C}$.
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