Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 19: Nuclear Structure/Spectroscopy III

HK 19.1: Group Report

Tuesday, March 9, 2004, 15:30–16:00, D

Fine Structure of the Isoscalar Giant Quadrupole Resonance High-Resolution Inelastic Proton Scattering Experiments^* — •A. Shevchenko¹, J. Carter², R.W. Fearick³, S.V. Förtsch⁴, Y. Fujita⁵, D. Lacroix⁶, J.J. Lawrie⁴, Y. Kalmykov¹, P. von Neumann-Cosel¹, V.Yu. Ponomarev¹, A. Richter¹, F.D. Smit⁴, and J. Wambach¹ — ¹Institut für Kernphysik, Technische Universität Darmstadt, Germany — ²School of Physics, University of the Witwatersrand, Johannesburg, South Africa — ³Physics Department, University of Cape Town, South Africa — ⁴iThemba LABS, Somerset West, South Africa — ⁵Physics Department, University of Osaka, Japan — ⁶LPC Caen, France

Fine structure of giant resonances carries important information on the coherent motion of nucleons in collective modes of excitations and on the role of different damping mechanisms of giant resonances. A systematic study of the fine structure of giant resonances for the example of the ISGQR was carried out using high-resolution inelastic proton scattering at iThemba LABS on a variety of closed-shell and deformed nuclei. The fine structure is established as a global phenomenon. Novel wavelet analysis methods have been developed for the extraction of characteristic energy scales of the fluctuations in the fine structure. New experimental results will be presented together with an interpretation of their physical nature based on various microscopic approaches including the coupling to complex configurations.
^*Supported by DFG, contracts SFB 634 and 445 SUA-113/6/0-1, and by the South African FRD.