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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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 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
Volume54
Issue number12
DOIs
Publication statusPublished - Dec 1 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Jingo, M., Buthelezi, E. Z., Carter, J., Cooper, G. R. J., Fearick, R. W., Förtsch, S. V., Kureba, C. O., Krumbholz, A. M., von Neumann-Cosel, P., Neveling, R., Papka, P., Poltoratska, I., Ponomarev, V. Y., Richter, A., Sideras-Haddad, E., Smit, F. D., Swartz, J. A., Tamii, A., & Usman, I. T. (2018). Studies of the Giant Dipole Resonance in 27Al , 40Ca , 56Fe , 58Ni and 208Pb with high energy-resolution inelastic proton scattering under 0°. European Physical Journal A, 54(12), [234]. https://doi.org/10.1140/epja/i2018-12664-5