Study of Unbound HePs Using Exact Diagonalization Technique

Asier Zubiaga; Filip Tuomisto; Martti Puska

doi:10.4028/www.scientific.net/MSF.733.38

Paper Titles

Towards the Positronium and Radiolytic Hydrogen Formation Mechanisms in Liquid Hydrocarbons
p.19

Testing of the Extended Tao-Eldrup Model on Porous VP-DVB Copolymers
p.24

Ps Bubble in Liquids
p.29

The Free Volume Dynamics
p.33

Study of Unbound HePs Using Exact Diagonalization Technique
p.38

Layer Structures of Composite Membranes for Water Filtration Elucidated by Variable-Energy Positron Annihilation
p.45

Effect of Water on the Size Distribution of Free-Volume Holes in Nafion Membrane
p.49

Annihilation Process of Positron in Degraded Nafion^®-117
p.53

Study of Thin Nafion^® Films for Fuel Cells Using Energy Variable Slow Positron Annihilation Spectroscopy
p.57

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Study of Unbound HePs Using Exact Diagonalization Technique

Abstract:

The many-body wavefunction of the unbound He-Ps system has been studied by the exact diagonalization of a explicitly correlated gaussians basis optimized by a stochastic variational method. The nucleus-positron distance has been varied by constraining the parameters of the nucleus-positron correlated gaussian term. The constraining technique allows to describe He and Ps interacting at different distances. The calculated wavefunction can be approximated as composed by weakly perturbed He and Ps atoms. The electron forming the Ps tends to be farther from the nucleus than the positron due to the strong electron-electron Pauli repulsion with the electrons of He. The described technique gives accurate energy and wave functions for Ps interacting with atoms that can be used to calculate the interaction potential of Ps with molecular matter.