Speaker
Prof.
Roger Fearick
(Dept. of Physics)
Description
R. W. Fearick1, B. Erler2, H. Matsubara3,4, P. von Neumann-Cosel2, I. Poltoratska2, A. Richter2, R. Roth2, A. Tamii4.
(1) Department of Physics, University of Cape Town, South Africa.
(2) Institut f\"ur Kernphysik, TU Darmstadt, Germany. (3) RIKEN, Tokyo, Japan.
(4) RCNP, Osaka, Japan.
We report on a study of the isovector giant dipole resonance (GDR) in light N=Z nuclei. Inelastic scattering of 295 MeV protons was measured at close to zero degrees at the Grand Raiden spectrometer at RCNP, at resolutions of 20-40 keV FWHM, for selfconjugate target nuclei from 16O to 40Ca with strongly varying ground-state structure (H. Matsubara, A. Tamii).
The GDR is clearly revealed in the spectra, and fine structure is observed across the range of nuclei. Characteristic scales of fine structure in the region of the GDR have been extracted using a continuous wavelet technique. Level densities were extracted using an autocorrelation analysis following a background subtraction using a discrete wavelet technique.
The extracted scales of fine structure have been compared to those extracted from RPA calculations with a realistic nucleon-nucleon interaction derived by the unitary correlation operator and similarity group renormalization methods, which have recently been extended to deformed nuclei. The analysis permits a test of the importance of Landau damping in explaining the fine structure of the GDR in light nuclei.
Primary author
Prof.
Roger Fearick
(Dept. of Physics)
