Study of the η–nucleus interaction in the pd→3He η reaction near threshold Original Research Article

A detailed study of the effect of the η–nucleus final state interaction (FSI) in the View the MathML source reaction close to threshold is presented. The FSI is incorporated through a T-matrix for η3He elastic scattering, constructed using few body equations. This T-matrix accounts for off-shell and binding effects in η–nucleus scattering. The energy dependence of the data on the View the MathML source reaction near threshold is reproduced only after including the FSI. The off-shell and binding effects in View the MathML source scattering are found to be important. Given the uncertainty in the knowledge of the elementary η–nucleon interaction, the sensitivity of the View the MathML source cross section to different prescriptions of the elementary t-matrix, tηN→ηN is also discussed.