Ratio of productions of pi+pi-atoms to free pi+pi- pairs with account of   the strong interaction in final states
  The ratio of productions of pi+pi- atoms to free pi+pi- pairs is calculated with account of the strong interaction in final states. It is shown that this ratio is expressed via a squared ratio of the well-known Coulomb wave functions and thus can be calculated with a high accuracy. 
L.Afanasyev, O.Voskresenskaya