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Large-space no-core shell model calculations have been performed for A=3-6nuclei, using a starting-energy-independent two-body effective interactionderived by application of the Lee-Suzuki similarity transformation. Thistransformation can be performed by direct calculation or by different iterationprocedures, which are described. A possible way of reducing the auxiliarypotential influence on the two-body effective interaction has also beenintroduced. The many-body effects have been partially taken into account byemploying the recently introduced multi-valued effective interaction approach.Dependence of the He5 energy levels on the harmonic-oscillator frequency aswell as on the size of the model space has been studied. The Reid 93nucleon-nucleon potential has been used in the study, but results have alsobeen obtained using the Nijmegen II potential for comparison.Comment: 19 pages. REVTEX. 2 PostScript figure

No-core shell-model calculations with starting-energy-independent multivalued effective interactions