Speaker
Mr
Chamunorwa Oscar Kureba
(School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa)
Description
Fine structure has been observed in the region of the Isoscalar Giant Quadrupole Resonance (ISGQR) in 142Nd, 144Nd, 146Nd, 148Nd and 150Nd target nuclei using high energy-resolution proton inelastic scattering. The 200 MeV proton beams were delivered by the Separated Sector Cyclotron (SSC) and 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. 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 ≤ Ex ≤ 15 MeV), since they extend from the semi-magic N = 82 nucleus (142Nd) to the permanently deformed N = 90 (150Nd) 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 width extracted shows a systematic broadening of the ISGQR, moving from spherical to highly deformed nuclei as has already been observed for the Isovector Giant Dipole Resonance (IVGDR) excited by γ-capture. Energy scales were extracted for the resonance region using the Continuous Wavelet Transform (CWT) technique. Experimental details, data extraction and analysis techniques, together with preliminary results will be presented.
Primary author
Mr
Chamunorwa Oscar Kureba
(School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa)
Co-authors
Prof.
Achim Richter
(Institut für Kernphysik, Technische Universität Darmstadt, D-64829, Darmstadt, Germany)
Mr
Andreas Krugmann
(Institut für Kernphysik, Technische Universität Darmstadt, D-64829, Darmstadt, Germany)
Ms
Anna-maria Heilman
(Institut für Kernphysik, Technische Universität Darmstadt, D-64829, Darmstadt, Germany)
Prof.
Atsushi Tamii
(Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 560-0047, Japan)
Dr
Deon Steyn
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa)
Dr
Dirk Fourie
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa)
Prof.
Elias Sideras-Haddad
(School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa)
Dr
Frederick Smit
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa)
Prof.
Gordon R. J Cooper
(School of Geosciences, University of the Witwatersrand, Johannesburg 2050, South Africa)
Dr
Iyabo Usman
(School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa)
Mr
Jacobus Swartz
(Department of Physics, University of Stellenbosch, Matieland 7602, South Africa)
Mr
Joele Mira
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa, Department of Physics, University of Stellenbosch, Matieland 7602, South Africa)
Prof.
John Carter
(School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa)
Dr
Justin Mabiala
(Department of Physics, University of Stellenbosch, Matieland 7602, South Africa)
Dr
Lowry Conradie
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa)
Mr
Maxwell Jingo
(School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa)
Dr
Paul Papka
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa, Department of Physics, University of Stellenbosch, Matieland 7602, South Africa)
Prof.
Peter Von Neumann-Cosel
(Institut für Kernphysik, Technische Universität Darmstadt, D-64829, Darmstadt, Germany)
Dr
Retief Neveling
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa)
Dr
Richard Newman
(Department of Physics, University of Stellenbosch, Matieland 7602, South Africa)
Prof.
Rodger Fearick
(Physics Department, University of Cape Town, Rondebosch 7700, South Africa)
Mr
Sean Murray
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa)
Dr
Siegfried FÖrtsch
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa)
Dr
Zinhle. B Buthelezi
(iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa)
