Inner-shell Annihilation of Positrons in Argon, Iron and Copper Atoms

Details Inner-shell Annihilation of Positrons in Argon, Iron and Copper Atoms Inner-shell Annihilation of Positrons in Argon, Iron and Copper Atoms

2007-11-03

arxiv.org/abs/0711.0453v1

Physics

Atomic Physics

22 pages, 8 figures

Scientific paper

The annihilation parameters of positrons with electrons in different shells of Argon, Iron and Copper atoms are calculated below the positronium (Ps) formation thresholds. Quite accurate ab initio calculations of the bound state wavefunctions of Argon, Iron and Copper orbitals are obtained from Cowan computer code. A least-squares variational method (LSVM) is used for determining the wavefunction of the positrons. The program is employed for calculating the s-wave partial cross sections of positrons scattered by Iron and Copper atoms. Our results of the effective charge are compared with available experimental and theoretical ones. --

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