9-13 July 2012
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=11&confId=14"><font color=#ff0000>SAIP2012 PROCEEDINGS AVAILABLE</font></a>

Investigation of fine structure of the Isovector Giant Dipole Resonance in nuclei across the periodic table using proton inelastic scattering at zero degrees

12 Jul 2012, 09:00
20m
Oral Presentation Track B - Nuclear, Particle and Radiation Physics NPRP

Speaker

Mr Maxwell Jingo (University of the Witwatersrand, Johannesburg, South Africa)

Abstract content <br> &nbsp; (Max 300 words)

A survey of the fine structure phenomenon of the Isovector Giant Dipole Resonance (IVGDR) was carried out at the K600 Magnetic Spectrometer of iThemba LABS using proton inelastic scattering at an incident energy of 200 MeV for a wide target-mass range including closed and near-closed shell nuclei: 27Al, 40Ca, 56Fe, 58Ni and 208Pb. The data obtained provide an unique insight into the role of different damping mechanisms contributing to the decay of the IVGDR. Absolute cross-sections together with systematics predictions on the position and width (&Gamma) in the nuclei studied 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 measured spectra for some of the target nuclei investigated. Such observations allow for the confirmation of their respective resonance widths, centroids and strengths for each identified giant resonance. Experimental results using other probes (e.g. &gamma-capture) exciting the IVGDR will also be compared to the present data. Characteristic energy scales from experimental are extracted using the wavelet analysis technique, and provide insight into the long-standing search for experimental signatures of scales associated with the coupling between collective states and internal degrees of freedom. Another vital aspect of the fine structure is its connection to nuclear level densities in the excitation region of giant resonances. Finally, the state-of-art microscopic models like the Quasi-particle Phonon Model (QPM) for medium-heavy nuclei and Second Random Phase Approximation (SRPA) for light nuclei will also be compared to the experimental data.

Apply to be<br> consider for a student <br> &nbsp; award (Yes / No)?

Yes

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

Prof John Carter (john.carter@wits.ac.za) and Prof Elias Sideras-Haddad, University of the Witwatersrand, Johannesburg

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Primary author

Mr Maxwell Jingo (University of the Witwatersrand, Johannesburg, South Africa)

Co-authors

Ms Anna-Maria Heilmann (Institut für Kernphysik, Technische Universität Darmstadt, Germany) Prof. Atsushi Tamii (Research Center for Nuclear Physics, Osaka University) Mr Chamunorwa Oscar Kureba (University of the Witwatersrand, Johannesburg, South Africa) Prof. Cooper Gordon R. J. (University of the Witwatersrand, School of Geosciencies, Johannesburg, South Africa) Dr Dirk Fourie (iThemba LABS, Cape Town, South Africa) Prof. Elias Sideras-Haddad (University of the Witwatersrand, Johannesburg, South Africa) Dr Fredrick Smit (iThemba LABS, Cape Town, South Africa) Dr Iryna Poltoratska (Institut für 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) Mr Joel Mira (iThemba LABS, Cape Town, University of Stellenbosch) 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 für Kernphysik, Technische Universität Darmstadt, Germany) Dr Retief Neveling (iThemba LABS, Cape Town, South Africa) Prof. Richard Newman (University of Stellenbosch, South Africa) Prof. Richter Achim (Institut für Kernphysik, Technische Universität Darmstadt, Germany) Prof. Roger Fearick (iThemba LABS, Cape Town, University of Cape Town) Mr Sean Murray (iThemba LABS, Cape Town, South Africa) Dr Siegfried Förtsch (iThemba LABS, Cape Town, South Africa) Dr Steyn Deon (iThemba LABS, Cape Town, South Africa) Dr Zinhle Buthelezi (iThemba LABS, Cape Town, South Africa)

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