Identyfikatory
Warianty tytułu
Języki publikacji
Abstrakty
The calculations of the influence of the self-energy effects on the electron-positron (e-p) enhancement factors and the e-p momentum distributions are presented. The approach bases on the novel formulation of the Bethe- -Goldstone (B-G) equation for the positron in an electron gas where the scattering of the electrons into the states below the Fermi surface due to the self-energy effects is allowed. This equation has been solved and the corresponding e-p enhancement factors and momentum distributions have been found. The agreement between the absolute values of the theoretical calculations and experimental data has improved noticeably.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
3--8
Opis fizyczny
Bibliogr. 17 poz., rys., wykr.
Twórcy
autor
- Institute of Physics, Opole University, 48 Oleska Str., 45-052 Opole, Poland, Tel.:+48 77 452 7250, Fax: +48 77 452 7290, E.Boronski@uni.opole.pl
Bibliografia
- 1. Arponen J, Pajanne E (1979) Angular correlation in positron annihilation. J Phys F 9:2359–2376
- 2. Arponen J, Pajanne E (1979) Electron liquid in collective description. III. Positron annihilation. Ann Phys 121:343–389
- 3. Boroński E (2006) Positron-electron annihilation rates in an electron gas studied by variational Monte Carlo simulation. Europhysics Lett 75:475–482
- 4. Boroński E, Nieminen RM (1986) Electron-positron density functional theory. Phys Rev B 34:3820–3831
- 5. Boroński E, Szotek Z, Stachowiak H (1981) Exact solution of the Kahana equation for a positron in an electron gas. Phys Rev B 23:1785–1795
- 6. Carbotte JP, Kahana S (1965) Positron annihilation in an interacting electron gas. Phys Rev A 139:213–222
- 7. Daniel E, Vosko S (1960) Momentum distribution of an interacting electron gas. Phys Rev 120:2041–2044
- 8. Kahana S (1963) Positron annihilation in metals. Phys Rev 129:1622–1628
- 9. Kontrym-Sznajd G (1990) Three-dimensional imagereconstruction with application in positron annihilation. Phys Status Solidi A 117:227–240
- 10. Kontrym-Sznajd G, Samsel-Czekala M, Pietraszko A (2002) Electron momentum density in yttrium. Phys Rev B 66:155110–155121
- 11. Mattuck RD (1967) A guide to Feynman diagrams in the many-body problem. McGraw-Hill Publishing Co, Ltd, London. Chapter 11, §3
- 12. Rubaszek A, Stachowiak H (1988) Self-consistent solution of the Kahana equation for a positron in an electron gas. Phys Rev B 38:3846–3855
- 13. Sormann H (1996) Influence of lattice effects on the electron-positron interaction in metals. Phys Rev B 54:4558–4581
- 14. Sormann H, Kontrym-Sznajd G (2006) Many-body effects on the electron-positron momentum density in simple and transition metals: comparison with positron annihilation spectroscopy data. Phys Rev B 73:75111-1-11
- 15. Sormann H, Puff W (1985) Momentum dependent enhancement factors in alkali metals. In: Jain PC, Singru RM (eds) Proc of the 7th Int Conf on Positron Annihilation, January 1985, New Delhi, India. World-Scientific, Singapore, pp 161–163
- 16. Stachowiak H, Boroński E (2005) Influence of the zero motion of a positron on positron lifetime in a metal lattice due to higher Fourier components of its Bloch function. Phys Rev B 71:245107-1-9
- 17. Tang Z, Nagai Y, Inoue K et al. (2005) Self energy correction to momentum-density distribution of positron--electron pairs. Phys Rev Lett 94:106402-1-4
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ7-0014-0001