9-13 July 2012
Africa/Johannesburg timezone
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Fine Structure of the Isovector Giant Dipole Resonance using the (p,p') reaction at zero degrees: Effects of strong nuclear deformation

Presented by Ms. Lindsay DONALDSON on 10 Jul 2012 from 17:30 to 19:30
Type: Poster Presentation
Session: Poster Session
Track: Track B - Nuclear, Particle and Radiation Physics

Abstract

The decay of giant resonances in nuclei is a prime example of how a well-ordered collective excitation dissolves into a disordered motion of internal degrees of freedom in fermionic quantum many-body systems. Fine structure of the Isovector Giant Dipole Resonance (IVGDR) for the neodymium isotope chain, <sup>142,144,146,148,150</sup>Nd, has been observed in high energy-resolution inelastic proton scattering experiments. The state-of-the-art K600 magnetic spectrometer of iThemba LABS was used to perform these experiments at zero-degrees scattering angle with an incident proton energy of 200 MeV. The analysis of the measured (p,p') energy spectra will yield insight into the transition from spherical (<sup>142</sup>Nd) to highly deformed (<sup>150</sup>Nd) nuclei and provide information about the dominant damping mechanisms. A comparison can be made to (&gamma,<i>xn</i>) data which clearly show a broadening and splitting of the IVGDR as deformation increases. It should be noted that other resonances are also observed at zero degrees. In particular, the Isoscalar Giant Quadrupole Resonance (ISGQR) for which comparisons can be made to data taken in a complimentary experiment at finite scattering angles. Preliminary results will be presented.

Award

Yes

Level

MSc

Supervisor

Professor John Carter: john.carter@wits.ac.za University of the Witwatersrand

Paper

No

Place

Location: IT Building
Room:


Primary authors

  • Ms. Lindsay DONALDSON School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
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Co-authors

  • Dr. Zinhle BUTHELEZI iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa
  • Prof. John CARTER School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
  • Prof. Gordon COOPER School of Geosciences, University of the Witwatersrand, Johannesburg 2050, South Africa
  • Prof. Roger FEARICK Physics Department, University of Cape Town, Rondebosch 7700, South Africa
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