9-13 July 2012
Africa/Johannesburg timezone
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Investigation of fine structure of the Isovector Giant Dipole Resonance in nuclei across the periodic table using proton inelastic scattering at zero degrees

Presented by Mr. Maxwell JINGO on 12 Jul 2012 from 09:00 to 09:20
Type: Oral Presentation
Session: NPRP
Track: Track B - Nuclear, Particle and Radiation Physics


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: <sup>27</sup>Al, <sup>40</sup>Ca, <sup>56</sup>Fe, <sup>58</sup>Ni and <sup>208</sup>Pb. 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.






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




Location: IT 4-1

Primary authors