Critical points of scattering positrons from neon, krypton and xenon atoms at low energy regions by using dipole polarization potential

الملخص EN

The elastic Scattering of positrons from Ne, Kr, and Xe atoms is studied by using a simple model potential, called polarization - correlation potential (PCP) , to represent the interaction between the positron and target atoms.

This model contains the static potential and Jain correlation potential.

together with the polarization interaction ( (0) / 2r4 ) D −α, where D α (0) is the dipole target polarisability.

The optical potential of the e+ - atom system is treated exactly in a partial - wave analysis to extract the scattering parameters.

We have calculated the phase shifts, differential cross sections (DCS’s), total cross sections (TCS’s) and momentum transfer cross sections (MTCS’s).

Our results gave a good agreement with other experimental and theoretical values.

We also discussed the critical points (representing the minima in the differential scattering cross section) in the low - energy e+ - Ne , Kr and , Xe scattering.