Fully relativistic calculation of the two-photon momentum distribution for positron annihilation in tungsten

1991 ◽  
Vol 43 (9) ◽  
pp. 6996-7002 ◽  
Author(s):  
G. J. Rozing ◽  
P. E. Mijnarends ◽  
R. Benedek
Keyword(s):  
Positron Annihilation ◽  
Momentum Distribution ◽  
Photon Momentum ◽  
Two Photon ◽  
Relativistic Calculation

MOMENTUM DISTRIBUTION OF METALLIC ELECTRONS BY POSITRON ANNIHILATION

1957 ◽  
Vol 35 (2) ◽  
pp. 168-183 ◽  
Author(s):  
A. T. Stewart
Keyword(s):  
Positron Annihilation ◽  
Momentum Distribution ◽  
Center Of Mass ◽  
Velocity Dependence ◽  
Conduction Electrons ◽  
Two Photon ◽  
Photon Decay ◽  
Electron Positron ◽  
Momentum Distributions ◽  
Annihilation Probability

The angular correlation of photons from the two-photon decay of positrons has been measured for positrons annihilating in some 34 elements, mostly metals. These data give the momentum distribution of photons and hence of the center of mass of the annihilating electron–positron pairs. The momentum distributions are discussed in terms of the velocity dependence of the annihilation probability. It is concluded that the observed momentum distributions are primarily the momentum distributions of the conduction electrons in the metals. A higher momentum component is observed, which is attributed to ion core effects.

Positron annihilation in alloys

1977 ◽  
Vol 55 (15) ◽  
pp. 1335-1341 ◽  
Author(s):  
K. M. Hong ◽  
J. P. Carbotte
Keyword(s):  
Positron Annihilation ◽  
Momentum Distribution ◽  
Coherent Potential Approximation ◽  
Fermi Momentum ◽  
Photon Momentum ◽  
Numerical Computations ◽  
Potential Approximation ◽  
Momentum Distributions ◽  
Annihilation Photon

A coherent potential approximation (CPA) treatment of positron annihilation in an alloy is presented. Simple formulae for the spatial and the momentum distributions of the positrons are derived. Numerical computations are performed to illustrate the effects of the smearing of the positron momentum distribution and of the electron Fermi momentum of the annihilation photon momentum distribution.

Systematics of Two-Photon Momentum Distributions in 3d Transition Metals

1992 ◽  
Vol 105-110 ◽  
pp. 857-860
Author(s):  
V. Sundararajan ◽  
D.G. Kanhere ◽  
R.M. Singru
Keyword(s):  
Transition Metals ◽  
Photon Momentum ◽  
Two Photon ◽  
Momentum Distributions

Theory of Photons in a Fully Ionized Gas. I. Photon Momentum Distribution

1969 ◽  
Vol 177 (1) ◽  
pp. 359-370 ◽  
Author(s):  
In Kil Hwang ◽  
W. T. Grandy
Keyword(s):  
Momentum Distribution ◽  
Photon Momentum ◽  
Ionized Gas
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