Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 10: Poster Session: Nuclear Physics/Spectroscopy
HK 10.28: Poster
Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie
Fine Structure of the Isoscalar Giant Quadrupole Resonance in Closed-Shell Nuclei from High-Resolution Inelastic Proton Scattering* — •A. Shevchenko6, J. Carter1, R. Fearick2, S. Förtsch3, Y. Fujita4, D. Lacroix5, J. Lawrie3, Y. Kalmykov6, S. Mukherjee3, R. Newman3, P. von Neumann-Cosel6, V. Ponomarev6, A. Richter6, F. Smit3, and J. Wambach6 — 1Physics Department, University of the Witwatersrand, Johannesburg, South Africa — 2Physics Department, University of Cape Town, South Africa — 3National Accelerator Centre (NAC), Faure, South Africa — 4University of Osaka, Japan — 5LPC Caen — 6Institut für Kernphysik, Technische Universität Darmstadt, Germany
The fine structure of giant resonances carries important information on the coherent motion of nucleons in collective modes of excitations and on the role of internal and external mixing for the damping.This is reflected in characteristic energy scales which can be extracted using a wavelet analysis [1]. After successful application to 208Pb new experiments at NAC with high-resolution (35-50 keV) inelastic proton scattering on a variety of closed-shell nuclei were carried out under kinematical conditions favoring excitation of the ISGQR. They show that the appearence of fine structure is a global phenomenon. First results and an interpretation in comparison to microscopic QPM calculations including coupling to 2p-2h states are presented.
[1] D. Lacroix et al., Phys. Lett. B479 (2000) 15 *Supported by the DFG under contract FOR 272/2-1 and by the South-African FRD.