Positronium ( Ps ), the bound state of an electron and its antiparticle the positron, is an interesting projectile as it is the lightest known atom. Recently the breakup of Ps atom in
collision with atom (He) has been studied both experimentally [1] and theoretically [2]. In the
present work we have studied the positronium break up cross sections in the triple differential
(TDCS) level in collision of Ps with a singly charged He⁺ ion in the framework of
post collisional Eikonal approximation [3] in the intermediate and high energy regime. Correlation
effect between the electron - positron pair (that forms the Ps atom ) is also taken into account
in the final channel. A remarkable feature in the obtained positron distribution (angular) is
the forward peak (with a spread ) appearing at approximately half of the residual Ps energy
(E_res=E_ps - 6.8 eV ), which can be interpreted as an analogy of the
electron loss to the continuum (ELC) peak appearing in the energy spectrum ( DDCS ) of the
electrons in ion - atom or atom - atom collisions. Detailed results and discussions
will be presented at the Conference.

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