Memorial University DAI: Algebraic coupled-state calculation of positron-hydrogen collisions at low energy, using large coupling schemes

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Title	Algebraic coupled-state calculation of positron-hydrogen collisions at low energy, using large coupling schemes
Author	Kuang, Yu Rang, 1961-
Description	Thesis (Ph.D.)--Memorial University of Newfoundland, 1997. Physics
Date	1996
Pagination	x, 220 leaves
Subject	Positrons--Scattering; Positronium; Angular momentum (Nuclear physics)--Coupling and recoupling;
Degree	Ph.D.
Degree Grantor	Memorial University of Newfoundland. Dept. of Physics
Discipline	Physics
Language	Eng
Notes	Bibliography: leaves 102-109.
Abstract	The Harris-Nesbet algebraic approach is employed to carry out calculations of positron-hydrogen scattering at energy below the first excitation threshold of the hydrogen atom. The main work of this thesis is to extend the Harris-Nesbet method to large scale coupled-state calculations. With coupling schemes composed of lower physical states: 1s, 2s, 2p of both hydrogen and positronium, and a pseudo 3p of hydrogen associated with a number of short ranged correlation functions, calculations for positron-hydrogen scattering are accurately carried out for seven partial waves from L = 0 to 6. Comparison with available theoretical results shows that good agreement is obtained at energies considered. Our total elastic and total Ps formation cross sections are also in good agreement with existing accurate theoretical results. Our total Ps formation and integrated cross section (total elastic plus total Ps formation) agree with available experimental data. The scattering length obtained also agree well with the existing theoretical values. There are three, two and one resonances observed for the S-, P- and D-waves below the first excitation threshold of hydrogen, respectively, which confirms the existing observations. -- On the other hand, we also carry out calculations for an 18-state and a 20-state coupling schemes. Both sets of results show reasonable agreement with each other and available findings.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier	a1210308
Rights	The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(21.47 MB) -- http://collections.mun.ca/PDFs/theses/Kuang_YuRang.pdf
CONTENTdm file name	22727.cpd