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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Kernphysik / Spektroskopie

HK 15.9: Vortrag

Montag, 10. März 2008, 18:45–19:00, 2G

Damping mechanisms of the isoscalar giant quadrupole resonance in light nuclei* — •Iyabo Usman^1,2, John Carter¹, Golden Cooper¹, Elias Sideras-Haddad¹, Hirohiko Fujita^1,2, 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.