State-dependent effective interaction for the hyperspherical formalism with noncentral forces

The recently developed effective interaction method for the hyperspherical harmonic formalism is extended to noncentral forces. Binding energies and r adii of three- and four-body nuclei are calculated with AV6 and AV14 NN pot entials. Excellent results for the convergence of the expansion are found, particularly for the three-nucleon system. Due to the higher density the co nvergence rate is a bit slower for the alpha particle. In comparison to cen tral potential models there is only a very slight deterioration of the conv ergence due the tensor force, while other potential terms have no visible e ffect on the convergence. The obtained values for binding energy and radii also agree well with the results in the literature obtained with other few- body techniques. (C) 2001 Elsevier Science B.V. All rights reserved.