Electron capture from hydrogenic systems by positrons and positive muons.

(1997) Electron capture from hydrogenic systems by positrons and positive muons. Masters thesis, King Fahd University of Petroleum and Minerals.


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English Abstract

In the present study the cross sections of the following reactions have been calculated in the framework of the impulse approximation: e⁺ + H(1s) ---> (e⁺ e⁻)(1s) + H⁺ e⁺ + He⁺¹ (1s) ---> (e⁺e⁻)(1s) + He⁺², μ⁺ + X(1s) ---> (μ⁺e⁻)(1s) + X⁺¹ where X stands for H, He⁺¹, Li⁺², C⁺⁵, N⁺⁶, O⁺⁷ and Fe⁺²⁵. Though the impulse approximation was introduced as an improvement on the Born approximation, it was found to be systematically worse for scattering of electrons off atoms. However, for electron capture total cross sections from hydrogenic systems by positrons, in the energy range for which the impulse approximation is valid, the impulse approximation seems to be better. In this thesis the calculation shows features in the differential cross sections which indicate that even if the impulse approximation proves worse than the Born approximation for the total cross sections in these cases, the differential cross section may be better described by it.

Item Type: Thesis (Masters)
Subjects: Physics
Department: College of Engineering and Physics > Physics
Committee Advisor: Riazuddin, -
Committee Members: Mavromatis, H. A. and Qadir, Asghar and Bahlouli, H
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 13:55
Last Modified: 01 Nov 2019 13:56
URI: http://eprints.kfupm.edu.sa/id/eprint/10045