7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Fine structure of the Isovector Giant Dipole Resonance from light to heavy-mass nuclei and 1<sup>-</sup> level densities using (p,p') scattering at zero degrees

9 Jul 2014, 14:40
D Les 101

D Les 101

Oral Presentation Track B - Nuclear, Particle and Radiation Physics NPRP


Mr Maxwell Jingo (University of the Witwatersrand)

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Main supervisor (name and email)<br>and his / her institution

Prof. John Carter, john.carter@wits.ac.za, Wits

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

A survey of the fine structure phenomenon of the Isovector Giant Dipole Resonance (IVGDR) was carried out, using proton inelastic scattering for an incident energy of 200 MeV separated sector using the cyclotron at iThemba LABS and the K600 magnetic spectrometer at zero degrees for a wide target-mass range of closed and near-closed shell nuclei: 27Al, 40Ca, 56Fe, 58Ni and 208Pb. A background subtraction procedure which eliminates the contributions due to the Isoscalar Giant Quadrupole Resonance (ISGQR), Isovector Giant Quadrupole Resonance (IVGQR), quasi-free scattering and the phenomenological background effects was implemented before the experimental cross-section data were converted into equivalent photo-absorption cross-sections. The obtained equivalent photo-absorption cross-sections were then compared with photo-nuclear data available in the literature. Characteristic energy scales from both the experimental data and state-of-art QPM calculations of the IVGDR were extracted using the wavelet analysis technique. In addition, experimental level densities of J&pi = 1- states were extracted using the fluctuation analysis method. The method utilises the autocorrelation function which is a key tool in obtaining a measure of the cross-section fluctuations with respect to a stationary mean value. It also makes use of the Discrete Wavelet Transform (DWT) analysis which is crucial in removing the remaining physical background from other multipoles excited and any remaining instrumental background. The experimentally extracted level densities were then compared with different theoretical parameterisations of the Hartree Fock-Bogoliubov (HFB), Hartree Fock-Bardeen-Cooper-Schrieffer (HF-BCS) and Back shifted Fermi Gas model (BSFG). Capabilities and limitations of the recently commissioned zero-degree facility of the K600 magnetic spectrometer will be discussed.

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Primary author

Mr Maxwell Jingo (University of the Witwatersrand)


Ms A. M. Heilmann (Technische Universitat Darmstadt) Prof. A. Richter (Technische Universitat Darmstadt) Prof. A. Tamii (Osaka University, Japan) Mr Chamunorwa Oscar Kureba (University of the Witwatersrand) Dr D. T. Fourie (iThemba LABS) Dr Deoin Steyn (iThemba LABS) Prof. ELIAS SIDERAS-HADDAD (University of the Witwatersrand) Dr Frederick David Smit (iThemba LABS) Prof. G. R. J. Cooper (University of the Witwatersrand) Dr I. Poltoratska (Technische Universitat Darmstadt) Dr Iyabo Usman (University of the Witwatersrand) Mr Jacobus Swartz (Stellenbosch University) Dr Joele Mira (iThemba LABS) Prof. John Carter (University of the Witwatersrand) Dr Lowry Conradie (iThemba Labs) Prof. P. von Neumann-Cosel (Technische Universitat Darmstadt) Dr Paul Papka (Stellenbosch University) Dr Retief Neveling (iThemba LABS) Dr Richard Newman (Stellenbosch University) Prof. Roger Fearick (University of Cape Town) Mr Sean Murray (iThemba LABS) Dr Siegfried Förtsch (iThemba LABS) Dr Zinhle Buthelezi (iThemba LABS)

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