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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
Regular Article - Experimental Physics
  • 22 Downloads

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 ( \( \Delta E\simeq 40\) 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.

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Copyright information

© SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • M. Jingo
    • 1
    • 2
  • E. Z. Buthelezi
    • 3
  • J. Carter
    • 1
  • G. R. J. Cooper
    • 4
  • R. W. Fearick
    • 5
  • S. V. Förtsch
    • 3
  • C. O. Kureba
    • 1
  • A. M. Krumbholz
    • 6
  • P. von Neumann-Cosel
    • 6
  • R. Neveling
    • 3
  • P. Papka
    • 7
  • I. Poltoratska
    • 6
  • V. Yu. Ponomarev
    • 6
  • A. Richter
    • 6
  • E. Sideras-Haddad
    • 1
  • F. D. Smit
    • 3
  • J. A. Swartz
    • 7
  • A. Tamii
    • 8
  • I. T. Usman
    • 1
  1. 1.School of PhysicsUniversity of the WitwatersrandJohannesburgSouth Africa
  2. 2.Department of Orthopaedic SurgeryUniversity of the WitwatersrandJohannesburgSouth Africa
  3. 3.Department of Subatomic PhysicsiThemba LABSSomerset WestSouth Africa
  4. 4.School of Earth SciencesUniversity of the WitwatersrandJohannesburgSouth Africa
  5. 5.Department of PhysicsUniversity of Cape TownRondeboschSouth Africa
  6. 6.Institut für KernphysikTechnische Universität DarmstadtDarmstadtGermany
  7. 7.Department of PhysicsUniversity of StellenboschMatielandSouth Africa
  8. 8.Research Center for Nuclear PhysicsOsaka UniversityIbaraki, OsakaJapan

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