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A survey of the fine structure of the Isovector Giant Dipole Resonance(IVGDR) was performed, using the recently commissioned zero-degree facility ofthe K600 magnetic spectrometer at iThemba LABS. Inelastic proton scattering atan incident energy of 200 MeV was measured on $^{27}$Al, $^{40}$Ca, $^{56}$Fe,$^{58}$Ni and $^{208}$Pb. A high energy resolution ($\rm{\Delta}\it{E} \simeq$40 keV FWHM) could be achieved after utilising faint-beam anddispersion-matching techniques. Considerable fine structure is observed in theenergy region of the IVGDR and characteristic energy scales are extracted fromthe experimental data by means of a wavelet analysis. The comparison withQuasiparticle-Phonon Model (QPM) calculations provides insight into therelevance of different giant resonance decay mechanisms. Photoabsorption crosssections derived from the data assuming dominance of relativistic Coulombexcitation are in fair agreement with previous work using real photons.

european physical journal. a, hadrons and nuclei

Studies of the Giant Dipole Resonance in $^{27}$Al, $^{40}$Ca,  $^{56}$Fe, $^{58}$Ni and $^{208}$Pb with high energy-resolution inelastic  proton scattering under 0$^\circ$