A model is formulated for a system of several valence nucleons coupled to a core. Single-particle orbits in this model can be determined consistently with underlying potentials between the core and the valence nucleon. A continuum spectrum for the single-particle state is taken into account through its discretization. A very simple system, the He isotopes, is used to show the feasibility of the model.

• Received 25 September 1989

DOI:https://doi.org/10.1103/PhysRevC.41.736