7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Calculation of atomic-based electron-positron annihilation momentum density in superionic barium flouride

8 Jul 2014, 17:10
1h 50m
D Ring ground level

D Ring ground level

Board: A.31
Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster1


Thulani Jili (University of Zululand)

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Theoretical calculations based on the Generalized Gradient Approximation, which takes into account the variation nature of charge density, are performed to retrieve the contributions of atomic core and valence towards positron-electron annihilation momentum density in BaF2. The annihilation momentum of the 6s state electrons with positrons is prominent between 2.5 mrad to 26.8 mrad corresponding to normalized positron-electron annihilation momentum density between 4.6E-2 and 9.0E-5. The 4d dominates the 5p in the momentum range, 3 mrad to 17 mrad. Positron annihilation rates are also calculated within the Independent Particle Model and Generalized Gradient Approximation. Resultant positron-electron annihilation momentum density is compared with experimental results.

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Primary author

Thulani Jili (University of Zululand)


Dr Betty Kibirige (University of Zululand) Dr Daniel Wamwangi (University of Witwatersrand) Prof. Elias Sideras-Haddad (University of the Witwatersrand) Mr Percy Sefage (University of Zululand)

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