3-BODY CONTINUUM STRUCTURE AND RESPONSE FUNCTIONS OF HALO NUCLEI (I) - HE-6

Three-body scattering states of the Borromean two-neutron halo nuclei are explored in a core + n + n model using the method of hyperspherica l harmonics. We analyse the continuum structure (the properties of the continuum wave functions) separately from the continuum response (the magnitudes of one-step transitions from the ground state to the conti nuum). Predictions are made for the positions and strengths of the iso scalar monopole, electric dipole and quadrupole excitations, as well a s for nuclear inelastic and charge-exchange response functions, for th e He-6 nucleus. The known 2(+) resonance in He-6 is reproduced. We fin d 1(-) strength concentrations at lower energies in the proximity of t he three-body threshold and predict new 2(+), 1(+) (and possibly 0(+)) resonances at slightly higher energies in He-6. (C) 1998 Elsevier Sci ence B.V.