Md ABDUL KHAN and TAPAN KUMAR DAS

Department of Physics, University of Calcutta, 92 APC Road, Kolkata 700 009, India

Hyperspherical harmonics expansion method is applied to a three-body model of two neutron halo nuclei. Convergence of the expansion has been ensured. A repulsive part is introduced in the interaction between the core and the extra-core neutron, to simulate Pauli principle. Two neutron separation energy, r.m.s. radii, correlation factor and probability density distributions have been calculated for $^6$He. It is found that the convergence of the two neutron separation energy is relatively slow, while other quantities reach convergence quickly..

Keywords:  Raynal Revai coefficient (RRC); hyperspherical harmonics expansion (HHE); hyperspherical harmonics (HH).

Pacs Nos.  21.45.+v; 21.10.Dr; 27.10.+h