Solution of the five-body eta He-4 problem with separable pole expansion method

摘要

The Alt-Grassberger-Sandhas equations for the five-body eta - 4N problem are solved for the case of the driving eta N and NN potentials limited to s-waves. Separable expansion of the transition amplitudes in all different subsystems is employed to convert the five-body equations into the effective two-body form. Numerical results are presented for the eta He-4 scattering length. (C) 2017 The Authors. Published by Elsevier B.V.