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Dissertations / Theses on the topic 'Positron annihilation'

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Published: 4 June 2021
Last updated: 30 July 2024

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1

Moscoso, Michael Douglas. "Electron-positron pair winds /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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2

Green, D. G. "Positron annihilation on core electrons." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557607.

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Diagrammatic many-body theory (MBT) is used to calculate the -y-spectra and an- nihilation rates for positrons annihilating on the core electrons of many-electron atoms. Long-range positron-atom and short-range positron-electron correlations are accounted for through the evaluation of the positron Dyson orbital and the true many-body annihilation vertex, which includes the exact electron-positron ladder series. The numerical implementation of the theory proceeds through the employment of a B-spline basis. It is tested through a comprehensive study of positron annihilation in the hydrogen-like ions He ", Li2+, BH and F8+, the ionization energies of which span those typical of the core electrons of many-electron atoms. The scattering phase shifts and normalized annihilation rate parameters Zeff are found to be in excellent agreement with existing sophisticated variational calculations, and -y-spectra are also predicted. , The annihilation ')'-spectra and partial annihilation rates are then calculated for ther- malized positrons annihilating on the core and valence electrons of the noble gas atoms Ar, Kr and Xe. Although stronger for the valence shells, the short-range correlations are found to significantly enhance the -y-spectra of the core subshells. For Ar, Kr and Xe, the core contributions to Zeff are found to be 0,55%, 1.5% and 2.2% respectively, their small values reflecting the difficulty for the positron to probe distances close to the nucleus. However, the core subshells have a broad momentum distribution and they markedly contribute to, and even dominate, the -y-spectra at Doppler energy shifts .2::. 3 ke V. It is found that proper inclusion of the core spectra is crucial in bringing the theoretical spectra into agreement with the experiment across the full range of Doppler energy shifts. State-dependent vertex enhancement factors 1nl, which quantify the effects of the short- range correlations, are estimated analytically and calculated using the MBT. They are found to follow a simple and physically motivated scaling with the subshell ionization energy Inz: 1nl = 1 + AI.;r;:z + sr], where A, Band (3 are positive constants. These factors can be incorporated in simple independent-particle-model calculations to reconstruct the true annihilation -y-spectra for annihilation on core electrons of atoms across the periodic table, and on the localized atomic-like core electrons of condensed matter systems. In the last part of the work, the atomic MBT is used to address the important problem of calculating the annihilation -y-spectra of molecues, with focus on the role of the positron- nuclear repulsion and correlation effects.
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3

Brown, A. P. "Positron annihilation at metal surfaces." Thesis, University of East Anglia, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381743.

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4

Steinbacher, John James. "Positron annihilation in simple condensed gases." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0001/NQ35980.pdf.

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5

Iwata, Koji. "Positron annihilation on atoms and molecules /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9811796.

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6

Shan, Yueyue. "A study of GaAs and CdZnTe by positron annihilation spectroscopy /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19324248.

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7

Shan, Yueyue, and 沈躍躍. "A study of GaAs and CdZnTe by positron annihilation spectroscopy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31237630.

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8

區皓良 and Ho-leung Au. "Experimental studies of positron annihilation in semiconductors." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31233417.

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9

Au, Ho-leung. "Experimental studies of positron annihilation in semiconductors /." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13570419.

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10

Avalos, Victor P. "Positron annihilation investigation of electron irradiated silicon." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23204.pdf.

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11

Turnock, Graham. "Applications of resummation techniques to electron-positron annihilation." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259591.

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12

Taylor, James Williams. "Positron annihilation spectroscopy applied to silicon-based materials." Thesis, Royal Holloway, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394376.

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13

Lee, C. M. R. "Positron annihilation on molecules : the role of vibrations." Thesis, Queen's University Belfast, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437434.

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14

Chen, Dan. "A novel design of a variable energy positron lifetime beam." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39558794.

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15

胡一帆 and Yifan Hu. "Improvement in positron beam optics and some positron beam studies of GaN and Amorphous-si:H thin films." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B4257559X.

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16

Hu, Yifan. "Improvement in positron beam optics and some positron beam studies of GaN and Amorphous-si:H thin films." Click to view the E-thesis via HKUTO, 2000. http://sunzi.lib.hku.hk/hkuto/record/B4257559X.

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17

Shan, Yueyue. "Study of GaAs as a possible field assisted positron moderator /." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13692641.

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18

張秀霞 and Sau-ha Cheung. "Positron lifetime and mobility studies of SiC." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31220599.

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19

Cheung, Sau-ha. "Positron lifetime and mobility studies of SiC /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20357710.

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20

胡一帆 and Yi-fan Hu. "Positron beam studies on the electric field at metal-semiinsulating GaAs interfaces." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31215312.

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21

Hu, Yi-fan. "Positron beam studies on the electric field at metal-semiinsulating GaAs interfaces /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19036620.

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22

Bondarenko, Vladimir. "Positron annihilation study of equilibrium point defects in GaAs." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971611637.

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23

Jobando, Vincent Okello. "Positron annihilation spectroscopy study of rubber-carbon black composites." Fort Worth, Tex. : Texas Christian University, 2006. http://etd.tcu.edu/etdfiles/available/etd-12052006-093021/unrestricted/Jobando.pdf.

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24

Fernandez, Hincapie Jhon Jairo. "Characterisation of microporous carbons by positron annihilation lifetime spectroscopy." Thesis, University of Strathclyde, 2005. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21596.

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Gasification of coal and other organic materials using oxidative gases such as oxygen, carbon dioxide or steam produces porous carbon materials. The uncertainty in porosity information can be inadequate for a number of potentially applications of microporous carbons. Positron annihilation lifetime spectroscopy (PALS) senses the electronic properties of condensed matter. A PALS experiment implies the measurement of the lifetime, which is the inverse of the annihilation rate. In the present work PALS has been applied to characterise the porosity of gasified carbon materials. In the case of active carbon fibers (ACFs) the characterization by gas adsorption showed that these materials are essentially microporous with narrow pore size distribution. The PALS analysis showed two lifetime components. There is a predominant lifetime component (> 84%) which ranges from 376 to 393 ps and increases its value with the burn-off. The annihilation mechanism apparently depends on the activation agent. Saran based active carbons (ACs) were prepared by pyrolysis and activation using carbon dioxide, air and steam. Gas adsorption and small angle scattering (SAS) showed that these carbons are essentially microporous materials with wide pore size distribution. PALS showed only one lifetime component. This lifetime component (> 99%) ranges from 382 to 401 ps. The lifetime value increases with the burn-off for the C0₂ gasification process. Coal chars from Argonne Premium Coals were gasified using air, carbon dioxide and steam. The gas adsorption and SAS characterization of these activated chars indicated that they are a mixture of micro and mesoporous with a broad pore size distribution. For these samples PALS showed only one lifetime component this ranges from 352 to 367 ps. A good correlation between gas adsorption, SAS and PALS analyses permits to associate the main lifetime with the mean micropore size to ACF and AC materials.
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25

Li, Ming, and 李銘. "Some AB initio studies of positron annihilation in semiconductors." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31238919.

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26

Nahn, Steven C. (Steven Christopher) 1968. "Pair production of W bosons in electron positron annihilation." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50334.

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27

Li, Ming. "Some AB initio studies of positron annihilation in semiconductors /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20128496.

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28

Pi, Xiaodong. "Positron annihilation spectroscopy of sub-surface defects in semiconductors." Thesis, University of Bath, 2003. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426150.

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29

Kwan, Pui-ying Rebecca, and 關珮瑩. "The focusing of the HKU positron beam, and an extended design for incorporating secondary electron-positron annihilation lifetimespectroscopy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36837192.

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30

Kwan, Pui-ying Rebecca. "The focusing of the HKU positron beam, and an extended design for incorporating secondary electron-positron annihilation lifetime spectroscopy." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36837192.

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31

Chen, Dan, and 陳丹. "A novel design of a variable energy positron lifetime beam." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39558794.

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32

Nahid, Farzana. "The temperature dependence of positronium formation in high density polyethylene." Thesis, Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/HKUTO/record/B39558642.

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33

沈躍躍 and Yueyue Shan. "Study of GaAs as a possible field assisted positron moderator." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31211847.

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34

雷美琪 and Mei-ki Pattie Lui. "Positron lifetime study of Zn-doped GaSb." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226437.

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35

Lui, Mei-ki Pattie. "Positron lifetime study of Zn-doped GaSb /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B24534328.

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36

Zhang, Junjie Jean Y. C. "Characterization of polymeric thin film by using positron annihilation spectroscopy." Diss., UMK access, 2005.

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Thesis (Ph. D.)--Dept. of Chemistry and School of Computing and Engineering. University of Missouri--Kansas City, 2005.
"A dissertation in chemistry and computer networking." Advisor: Yan-Ching Jean. Typescript. Vita. Description based on contents viewed Nov. 12, 2007; title from "catalog record" of the print edition. Includes bibliographical references (leaves 162-174). Online version of the print edition.
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37

Yang, Duanjie. "Study of radiation effects on polyurethanes by positron annihilation techniques." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39557327.

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38

Mackie, Ross Alexander. "Calculations and Measurements of Positron Annihilation Parameters in Perovskite Oxides." Thesis, University of Dundee, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521695.

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39

凌志聰 and Chi-chung Francis Ling. "Positron annihilation spectroscopic studies of GAAS and INP related systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31235062.

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40

Michopoulos, Yanos. "Perturbative QCD studies of multijet structures in electron-positron annihilation." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6702/.

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To investigate the effect in perturbative QCD of multigluon emissions on the transverse momentum distributions of multijet final states in electron-positron annihilation, we use a simplified model based on the approximation that gluons are emitted independently. As a guide to these multigluon emissions, we study the two-gluon contribution in some detail and calculate the Q(_T)-distribution for four-jet events in e(^+)e̅(^-)annihilation, using suitable jet-defining cuts, needed both theoretically, to regularize the soft- and collinear-gluon singularities, as well as experimentally, to group the final-state particles into distinct jets. To ascertain the accuracy of our approximate model, we compare our results with the exact ones, obtained by a Monte Carlo generation of events using the full matrix elements. We find that, for realistic values of the cuts, there is a significant kinematic region of agreement. This agreement and the validity of our model are further elaborated by taking its Abelian QCD limit, calculating distributions in other event shape variables and studying the jet broadening phenomenon. The applicability of our model is also delineated by finding it to be in remarkable structural and numerical agreement with the more exact algorithm of Altarelli et al. Finally, to investigate the effect of higher order and virtual graphs corrections to low order tree-level results, we use our model to calculate the O(a(^2)(_s)) Or-distribution for three-jet events in e(^+)e(^-) annihilation with virtual contributions included. We study the dependence of these corrections on the resolution parameters used to perform the (analytic) cancellation of infrared and collinear singularities between real and virtual graphs and discuss their physical consequences.
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41

Rayner, Simon. "Positron annihilation studies of high temperature superconductors and related compounds." Thesis, University of East Anglia, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291668.

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42

Malik, Farhad. "Positron annihilation spectroscopy of ion-implanted and laser-irradiated semiconductors." Thesis, University of Bath, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760745.

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43

Yu, Zhibin. "Positron and positronium annihilation lifetime, and free volume in polymers." Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1058206184.

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44

Ling, Chi-chung Francis. "Positron annihilation spectroscopic studies of GAAS and INP related systems /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17592513.

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45

Frost, Robert Lewis. "Slow positron annihilation spectroscopy applied to the analysis of the semiconductor, silicide, and titanium nitride structures." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/17298.

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46

Hawkes, C. M. "A study of the reaction esup(+)esup(-)-musup(+)musup(-)(gamma) at centre of mass energies up to 46.78GeV." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355754.

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47

Deng, Aihong, and 鄧愛紅. "Some defect studies on the compound semiconductors GaAs, InP and SiC using positron annihilation spectroscopy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31240124.

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48

Ng, Cheuk-kwong, and 吳卓光. "Implementing variable energy positron lifetime spectroscopy based on secondary electron timing from thin carbon foil in transmission geometry." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/207171.

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49

凌志聰 and Chi-chung Francis Ling. "Positron beam studies of the metal-GaAs (110) interface." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31211689.

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50

Ling, Chi-chung Francis. "Positron beam studies of the metal-GaAs (110) interface /." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13781443.

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