9-13 July 2012
Africa/Johannesburg timezone
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Effects of nuclear deformation on the fine structure of the Isoscalar Giant Quadrupole Resonance from even-even neodymium isotopes using proton inelastic scattering

Presented by Mr. Chamunorwa Oscar KUREBA on 12 Jul 2012 from 08:40 to 09:00
Type: Oral Presentation
Session: NPRP
Track: Track B - Nuclear, Particle and Radiation Physics

Abstract

A systematic experimental investigation of the phenomenon of fine structure, with emphasis on the region of the Isoscalar Giant Quadrupole Resonance (ISGQR), in nuclei across stable even-even neodymium isotopes has been performed. Measurements were made using the K600 Magnetic Spectrometer of iThemba Laboratory for Accelerator Based Sciences, a facility which is situated at Faure near Cape Town, South Africa. Unique high energy-resolution inelastic proton scattering excitation energy-spectra were obtained at an incident proton energy of E<sub>p</sub> = 200 MeV on targets <sup>142,144,146,148,150</sup>Nd. Nuclei with mass number A ≈ 150 and neutron number N ≈ 90 are of special interest since they occupy that region of the nuclide chart wherein the onset of permanent prolate deformation occurs. The stable neodymium (Z = 60) isotopes have been chosen in the present study, in order to investigate the effects accompanying the onset of deformation, on the excitation energy spectra in the ISGQR region (9 ≤ E<sub>x</sub> ≤ 15 MeV), since they extend from the semi-magic N = 82 nucleus (<sup>142</sup>Nd) to the permanently deformed N = 90 (<sup>150</sup>Nd) nucleus. In order to enhance the ISGQR in the excitation energy spectra measured, a Discrete Wavelet Transform (DWT) background subtraction was carried out. The resonance widths extracted show a systematic broadening of the ISGQR, moving from spherical to highly deformed nuclei as has already been observed for the Isovector Giant Dipole Resonance Resonance (IVGDR) excited by &gamma-capture. Energy scales were extracted for the resonance region using a Continuous Wavelet Transform (CWT) technique. Experimental details, data extraction and analysis techniques, together with preliminary results will be presented.

Award

Yes

Level

PhD

Supervisor

Prof J. Carter John.Carter@wits.ac.za University of the Witwatersrand

Paper

Yes

Place

Location: IT 4-1


Primary authors

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Co-authors

  • Prof. John CARTER School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
  • Prof. Elias SIDERAS-HADDAD School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
  • Dr. Retief NEVELING iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa
  • Dr. Iyabo USMAN School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
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