Origin of fine structure of the giant dipole resonance in sd-shell nuclei

Abstract

A set of high resolution zero-degree inelastic proton scattering data on 24Mg, 28Si, 32S, and 40Ca provides new insight into the long-standing puzzle of the origin of fragmentation of the Giant Dipole Resonance (GDR) in sd-shell nuclei. Understanding is provided by state-of-the-art theoretical Random Phase Approximation (RPA) calculatios for deformed nuclei using for the first time a realistic nucleon-nucleon interaction derived from the Argonne V18 potential with the unitary correlation operator method and supplemented by a phenomenological three-nucleon contact interaction. A wavelet analysis allows to extract significant scales both in the data and calculations characterizing the fine structure of the GDR. The fair agreement supports that the fine structure arises from ground-state deformation driven by alpha clustering.

7 pages, 5 figures

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• Fine Structure of the Isovector Giant Dipole Resonance in ${}^{142-150}$Nd and ${}^{152}$Sm
• 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${}^{\circ }$
• Damping of the isovector giant dipole resonance in ${}^{40,48}$Ca
• Gross, intermediate and fine structure of nuclear giant resonances: Evidence for doorway states
• Spreading widths of giant monopole resonance in the lead region: Random matrix approach
• Electric dipole strength in $sd$-shell nuclei from small-angle proton scattering
• Recent applications of the subtracted second RPA method