Speaker
Mr
Maxwell Jingo
(University of Witwatersrand, Johannesburg, South Africa)
Description
A survey of the fine structure phenomenon of the Isovector Giant Dipole Resonance (IVGDR) was carried out, using proton inelastic scattering at an incident energy of 200 MeV for a wide target-mass range of closed and near-closed shell nuclei: 27Al, 40Ca, 56Fe, 58Ni and 208Pb. The data obtained will provide an unique insight into the role of different damping mechanisms contributing to the decay of the IVGDR. A comparison between the present data and photo-absorption cross-sections will be done in order to check for consistency. Absolute cross-sections together with systematic predictions on the position and width (Γ) of the IVGDR in a given nuclei will be presented. The presence of other multipole admixtures, such the Isoscalar Giant Quadrupole Resonance (ISGQR) and Isovector Giant Quadrupole Resonance (IVGQR), were found in the obtained spectra in some of the target nucleus investigated. Such information led to the confirmation of their respective resonance widths, centroids and strengths for each identified giant resonance. Experimental results from other probes exciting the IVGDR will also be compared to this present work and the corresponding correlations extracted. Characteristic energy scales from the experimental data will be extracted using the wavelet analysis technique, an unique technique that has been able to provide a solution to the long-standing search for experimental signatures of scales associated with the coupling between collective states and internal degrees of freedom.
Primary author
Mr
Maxwell Jingo
(University of Witwatersrand, Johannesburg, South Africa)
Co-authors
Prof.
Achim Richter
(Institut fϋr Kernphysik, Technische Universität Darmstadt, Germany)
Ms
Anna-Maria Heilmann
(Institut fϋr Kernphysik, Technische Universität Darmstadt, Germany)
Prof.
Atsushi Tamii
(Research Center for Nuclear Physics, Osaka University, Japan)
Mr
Chamunorwa Oscar Kureba
(University of the Witwatersrand, Johannesburg, South Africa)
Dr
Dirk Fourie
(iThemba LABS, Cape Town, South Africa)
Prof.
Elias Sideras-Haddad
(University of the Witwatersrand, Johannesburg, South Africa)
Prof.
Gordon R.J Cooper
(School of Geosciences, Johannesburg, South Africa)
Dr
Iryna Poltoratska
(Institut fϋr Kernphysik, Technische Universität Darmstadt, Germany)
Dr
Iyabo Usman
(University of the Witwatersrand, Johannesburg, South Africa)
Mr
Jacobus Swartz
(iThemba LABS, Cape Town, University of Stellenbosch, South Africa)
Mr
Joel Mira
(iThemba LABS, Cape Town, University of Stellenbosch, South Africa)
Prof.
John Carter
(University of the Witwatersrand, Johannesburg, South Africa)
Dr
Lowry Conradie
(iThemba LABS, Cape Town, South Africa)
Dr
Paul Papka
(iThemba LABS, Cape Town, University of Stellenbosch, South Africa)
Prof.
Peter von Neumann-Cosel
(Institut fϋr Kernphysik, Technische Universität Darmstadt, Germany)
Dr
Retief Neveling
(iThemba LABS, Cape Town, South Africa)
Dr
Richard Newman
(University of Stellenbosch, Cape Town, South Africa)
Dr
Ricky Smit
(iThemba LABS, Cape Town, South Africa)
Prof.
Roger Fearick
(University of Cape Town, Cape Town, South Africa)
Mr
Sean Murray
(iThemba LABS, Cape Town, South Africa)
Dr
Siegfried Fortsch
(iThemba LABS, Cape Town, South Africa)
Dr
Zinhle Buthelezi
(iThemba LABS, Cape Town, South Africa)
