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We measured both the differential cross section ($\sigma_{p,p^\prime}$$=d^2\sigma/d\Omega dE_{x}$) and the $\gamma$-ray emission probability($R_\gamma(E_x)$ $=\sigma_{p,p^\prime\gamma}$/$\sigma_{p,p^\prime}$) from thegiant resonances excited by $\rm^{12}C$(\textit{p,p}$^\prime$) reaction at 392MeV and 0$^\circ$, using a magnetic spectrometer and an array of NaI(Tl)counters. The absolute value of $R_\gamma(E_x)$ was calibrated by using thewell-known $\gamma$-ray emission probability from $\rm^{12}C^* ( 15.11$ MeV, $1^+$, $T=1$) and $\rm^{16}O^* ( 6.9$ MeV, $2^+$, $T=0$) states within 5\%uncertainty. We found that $R_\gamma(E_x)$ starts from zero at $E_x=16$ MeV,increases to a maximum of 53.3$\pm$0.4$\pm$3.9\% at $E_x=27$ MeV and thendecreases. We also compared the measured values of $R_\gamma(E_x)$ withstatistical model calculation based on the Hauser-Feshbach formalism in theenergy region $E_x=$ 16-32 MeV and discussed the features of $\gamma$-rayemission probability quantitatively.

Measurement of $\gamma$ rays from the giant resonances excited by $^{12}$C$(p,p')$ reaction at 392 MeV and 0$^{\circ}$