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We have studied p-shell nuclei using a two-frequency shell-model approachwith an effective interaction derived from the Bonn-A nucleon-nucleon potentialby means of a G-matrix folded-diagram method. First, we briefly describe ourderivation of the effective interaction in a model space composed of harmonichoscillator wave functions with two different length parameters, b_in andb_out, for the core and the valence orbits, respectively. Then we present someselected results of our calculations. We show that a good agreement withexperiment is obtained, which is definitely better than that provided by astandard one-frequency calculation. A comparison with results obtained fromlarge-basis shell-model calculations is also made.Comment: 9 pages, 1 figure, talk presented at VIII Convegno di Fisica Nucleare  Teorica, Cortona, 18-21 Ottobre 200

p–SHELL NUCLEI AND TWO-FREQUENCY SHELL MODEL WITH A REALISTIC EFFECTIVE INTERACTION