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${}^{\circ }$

Abstract

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

arXiv comment15 pages, 15 figures

References in corpus (17)

• Complete electric dipole response and the neutron skin in 208Pb
• Magnetic dipole excitations in nuclei: elementary modes of nucleonic motion
• Nuclear Equation of State from ground and collective excited state properties of nuclei
• Electric dipole polarizability of ${}^{48}$Ca and implications for the neutron skin
• Dipole polarizability of 120Sn and nuclear energy density functionals
• Pygmy dipole resonance in 208Pb
• Photon data shed new light upon the GDR spreading width in heavy nuclei
• Low-energy electric dipole response in 120Sn
• R-process nucleosynthesis calculations with complete nuclear physics input
• Fine structure of the isovector giant dipole resonance in 208Pb: Characteristic scales and level densities
• Test of the Brink-Axel hypothesis for the pygmy dipole resonance
• Electromagnetic M1 transition strengths from inelastic proton scattering: The cases of 48Ca and 208Pb
• Anharmonic properties of double giant dipole resonance
• Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?
• Search for weak M1 transitions in ${}^{48}$Ca with inelastic proton scattering
• Wavelet signatures of $K$-splitting of the Isoscalar Giant Quadrupole Resonance in deformed nuclei from high-resolution (p,p${}^{\prime }$) scattering off ${}^{146,148,150}$Nd
• Origin of fine structure of the giant dipole resonance in sd-shell nuclei

Cited by in corpus (9)

• Electric and magnetic dipole modes in high-resolution inelastic proton scattering at $0^{\circ }$
• Fine Structure of the Isovector Giant Dipole Resonance in ${}^{142-150}$Nd and ${}^{152}$Sm
• Zero- and finite-temperature electromagnetic strength distributions in closed- and open-shell nuclei from first principles
• Damping of the isovector giant dipole resonance in ${}^{40,48}$Ca
• Gross, intermediate and fine structure of nuclear giant resonances: Evidence for doorway states
• Photoneutron cross section measurements on ${}^{208}$Pb in the Giant Dipole Resonance region
• Angela and the electric dipole response -- giant and pygmy, hot and cold, isoscalar and isovector
• Recent applications of the subtracted second RPA method
• Fine structure of the isoscalar giant monopole resonance in ${}^{48}$Ca