Shadini, A.M.D.M.Munasingha, J.2015-09-042015-09-042011Shadini, A.M.D.M. and Munasingha, J. 2011. Effect of long-range part of the potential on the elastic S-matrix element. Proceedings of the 67th Annual Sessions of Sri Lanka Association for the Advancement of Science, pp 60.1391-023Xhttp://repository.kln.ac.lk/handle/123456789/9452The quantum mechanical three-body Schrödinger equation can be reduced to a set of coupled differential equations when the projectile is easily breakable into two fragments and when scattering is a heavy stable nucleus. It has been found that the diagonal coupling potentials in this model take the inverse square form at sufficiently large radial distances and non-diagonal part of coupling potentials can be treated as sufficiently short-range to guarantee that numeral calculations are feasible. We will show that this long-range part of the potential has a small contribution to the elastic S-matrix element.enArticle