Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Kernphysik / Spektroskopie
HK 15.9: Talk
Monday, March 10, 2008, 18:45–19:00, 2G
Damping mechanisms of the isoscalar giant quadrupole resonance in light nuclei* — •Iyabo Usman1,2, John Carter1, Golden Cooper1, Elias Sideras-Haddad1, Hirohiko Fujita1,2, Zinhle Buthelezi2, Ricky Smit2, Siegiefred Förtsch2, Retief Neveling2, Peter von Neumann-Cosel3, Achim Richter3, Artem Shevchenko3, Jochen Wambach3, Roger Fearick4, and Yoshi Fujita5 — 1University of the Witwatersrand, Johannesburg, South Africa. — 2iThemba Laboratory for Accelerator Based Sciences, Cape Town, South Africa. — 3Technische Universitaet Darmstadt, D-64289 Darmstadt, Germany. — 4University of Cape Town, Cape Town, South Africa. — 5Osaka University, Toyonaka, Osaka, Japan
High energy-resolution experiments of the isoscalar giant quadrupole resonance have been carried out with the (p,p′) reaction using the K600 magnetic spectrometer at iThemba LABS, Somerset West, South Africa. A survey of medium-mass and heavy closed-shell nuclei has already demonstrated pronounced fine structure in all energy spectra. Characteristic energy scales have been extracted utilizing novel applications of wavelet techniques. These can be related to the coupling hierarchy in a doorway state model of the spreading width. The present work extends the investigation to 12C, 27Al, 28Si and 40Ca with an aim of testing the role of the escape width in the damping mechanism, which is known to be significant in lighter nuclei. First results will be presented.
* Supported by the DFG through SFB 634 and NE 679/2-2, and by the NRF.