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

M. Jingo, E. Z. Buthelezi, J. Carter, G. R.J. Cooper, R. W. Fearick, S. V. Förtsch, C. O. Kureba, A. M. Krumbholz, P. von Neumann-Cosel, R. Neveling, P. Papka, I. Poltoratska, V. Yu Ponomarev, A. Richter, E. Sideras-Haddad, F. D. Smit, J. A. Swartz, A. Tamii, I. T. Usman

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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 of the K600 magnetic spectrometer at iThemba LABS. Inelastic proton scattering at an incident energy of 200MeV was measured on 27Al , 40Ca , 56Fe , 58Ni and 208Pb. A high energy-resolution (ΔE≃ 40 keV FWHM) could be achieved after utilising faint-beam and dispersion-matching techniques. A 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 a dominance of relativistic Coulomb excitation are in fair agreement with previous work using real photons.

Original languageEnglish
Article number234
JournalEuropean Physical Journal A
Issue number12
Publication statusPublished - Dec 1 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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