Calculation of the Alpha--Particle Ground State within the   Hyperspherical Harmonic Basis
  The problem of calculating the four--nucleon bound state properties for the case of realistic two- and three-body nuclear potentials is studied using the hyperspherical harmonic (HH) approach. A careful analysis of the convergence of different classes of HH functions has been performed. A restricted basis is chosen to allow for accurate estimates of the binding energy and other properties of the 4He ground state. Results for various modern two-nucleon and two- plus three-nucleon interactions are presented. The 4He asymptotic normalization constants for separation in 2+2 and 1+3 clusters are also computed. 
M. Viviani (1), A. Kievsky (1) and S. Rosati (1,2) ((1) INFN, Sezione   di Pisa, Pisa (Italy), (2) Phys. Dept., Pisa Univers...