Fine structure of the isoscalar giant quadrupole resonance in Si28 and Al27

I. T. Usman, Z. Buthelezi, J. Carter, G. R. J. Cooper, R. W. Fearick, S. V. Förtsch, H. Fujita, Y. Fujita, P. von Neumann-Cosel, R. Neveling, P. Papakonstantinou, I. Pysmenetska, A. Richter, R. Roth, E. Sideras-Haddad, and F. D. Smit
Phys. Rev. C 94, 024308 – Published 5 August 2016

Abstract

The isoscalar giant quadrupole resonance in Si28 and Al27 has been investigated with high-energy-resolution proton inelastic scattering at Ep=200MeV and at scattering angles close to the maximum of ΔL=2 angular distributions with the K600 magnetic spectrometer of iThemba LABS, South Africa. Characteristic scales are extracted from the observed fine structure with a wavelet analysis and compared for Si28 with random-phase approximation and second random phase approximation calculations with an interaction derived from the Argonne V18 potential by a unitary transformation. A recent extension of the method to deformed nuclei provides the best description of the data, suggesting the significance of Landau damping.

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  • Received 17 June 2016

DOI:https://doi.org/10.1103/PhysRevC.94.024308

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

I. T. Usman1,2,*, Z. Buthelezi2, J. Carter1, G. R. J. Cooper3, R. W. Fearick4, S. V. Förtsch2, H. Fujita1,2,5, Y. Fujita5, P. von Neumann-Cosel6,†, R. Neveling2, P. Papakonstantinou7, I. Pysmenetska6, A. Richter6, R. Roth6, E. Sideras-Haddad1, and F. D. Smit2

  • 1School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
  • 2iThemba LABS, P.O. Box 722, Somerset West 7129, South Africa
  • 3School of Earth Sciences, University of the Witwatersrand, Johannesburg 2050, South Africa
  • 4Department of Physics, University of Cape Town, Rondebosch 7700, South Africa
  • 5Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • 6Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
  • 7Rare Isotope Science Project, Institute for Basic Science, Daejeon 34047, Korea

  • *iyabo.usman@wits.ac.za
  • vnc@ikp.tu-darmstadt.de

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Vol. 94, Iss. 2 — August 2016

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