Structure of proton resonances

Experimental data are presented which attest to the nonstatistical nature of proton resonances for excitation energies 6--15 MeV in light and intermediate nuclei. The reduced proton widths and the absolute-width and amplitude correlations are analyzed. Special attention is devoted to the amplitude relative-phase correlations. At the end of the review a possible reason for the manifestation of the nonstatistical nature of proton resonances is discussed.