Quasibound States of Eta-Mesic Deuteron and 3He

摘要

The concept of collision time in scattering is extended to evaluate the delay time in off-shell elastic scattering reactions at negative energies and is used to search for the quasibound states of eta mesons and light nuclei The r/-nucleus transition matrix is evaluated by solving few body equations within a finite rank approximation, The elementary interaction between the rj meson and a nucleon is described in terms of a coupled channel transition matrix which gives rise to an nN scattering length of 0.28 + iO. 19 fm The r)3He state predicted within this approach is in good agreement with the recent claim of an eta-mesic state confirmed from investigations of the photoproduction reaction 73He-" r)X.