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SHEVCHENKO, A; CARTER, J; NEVELING, R; PONOMAREV, V. Yu; RICHTER, A; SIDERAS-HADDAD, E; SMIT, F. D; WAMBACH, J; FEARICK, R. W; FÖRTSCH, S. V; FUJITA, H; FUJITA, Y; KALMYKOV, Y; LACROIX, D; LAWRIE, J. J; VON NEUMANN-COSEL, P
Physical review letters, 09/2004, Letnik: 93, Številka: 12Journal Article
Fine structure in the energy region of the isoscalar giant quadrupole resonance in nuclei is observed in high-resolution proton scattering experiments at iThemba LABS over a wide mass range. A novel method based on wavelet transforms is introduced for the extraction of scales characterizing the fine structure. A comparison with microscopic model calculations including two-particle two-hole (2p2h) degrees of freedom identifies the coupling to surface vibrations as the main source of the observed scales. A generic pattern is also found for the stochastic coupling to the background of the more complex states.
