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The fragmentation of the Isoscalar Giant Quadrupole Resonance (ISGQR) in 40Cahas been investigated in high energy-resolution experiments using protoninelastic scattering at E_p = 200 MeV. Fine structure is observed in the regionof the ISGQR and its characteristic energy scales are extracted from theexperimental data by means of a wavelet analysis. The experimental scales arewell described by Random Phase Approximation (RPA) and second-RPA calculationswith an effective interaction derived from a realistic nucleon-nucleoninteraction by the Unitary Correlation Operator Method (UCOM). In these resultscharacteristic scales are already present at the mean-field level pointing totheir origination in Landau damping, in contrast to the findings in heaviernuclei and also to SRPA calculations for 40Ca based on phenomenologicaleffective interactions, where fine structure is explained by the coupling totwo-particle two-hole (2p-2h) states.

Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?