Positron Annihilation with Core Electrons in the Noble Metals

1974 ◽  
Vol 52 (4) ◽  
pp. 336-339 ◽  
Author(s):  
E. H. Becker ◽  
A. G. Gould ◽  
E. M. D. Senicki ◽  
B. G. Hogg
Keyword(s):  
Simple Model ◽  
Fermi Surface ◽  
Single Crystals ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
Noble Metals ◽  
Correlation Data ◽  
Core Electrons

Experimental angular correlation curves for identically oriented single crystals of copper, silver, and gold have been obtained using "a point geometry" apparatus. The differences between these angular correlation data are compared to the differences predicted using a simple model of the Fermi surface combined with calculations of the theoretical core distributions.

Angular Correlation of Positron Annihilation Radiation from Single Crystals of Vanadium-Deuterium Alloys

1979 ◽  
Vol 46 (2) ◽  
pp. 481-487 ◽  
Author(s):  
Masayuki Hasegawa ◽  
Shu-ichi Koike ◽  
Makoto Hirabayashi ◽  
Hajime Asano ◽  
Toshiharu Suzuki
Keyword(s):  
Single Crystals ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
Annihilation Radiation

2D-angular correlation of positron annihilation on CeSb single crystals

1993 ◽  
Vol 186-188 ◽  
pp. 169-172 ◽  
Author(s):  
F. Itoh ◽  
H. Sakurai ◽  
T. Chiba ◽  
T. Akahane ◽  
T. Suzuki ◽  
...  
Keyword(s):  
Single Crystals ◽  
Positron Annihilation ◽  
Angular Correlation

On the analysis of the angular correlation data from positron annihilation in metals

1978 ◽  
Vol 46 (2) ◽  
pp. K107-K109 ◽  
Author(s):  
W. F. Huang ◽  
Y. C. Leung
Keyword(s):  
Positron Annihilation ◽  
Angular Correlation ◽  
Correlation Data

Pressure Dependence of Positron Annihilation in Alkali Metals

1975 ◽  
Vol 53 (5) ◽  
pp. 450-454 ◽  
Author(s):  
P. Kubica ◽  
M. J. Stott
Keyword(s):  
Positron Annihilation ◽  
Angular Correlation ◽  
Pressure Dependence ◽  
Alkali Metals ◽  
Correlation Data

The observed pressure dependence of the total positron annihilation rates in alkali metals has been studied. The observation that the rates increase more rapidly with pressure than the estimated valence annihilation rates alone has been explained in terms of increased positron penetration into the ion cores. This picture is shown to be consistent with observed changes with pressure in angular correlation data for Na.

Positron Annihilation in Teflon and Polyethylene

1974 ◽  
Vol 52 (11) ◽  
pp. 935-939 ◽  
Author(s):  
Donald P. Kerr
Keyword(s):  
Angular Distribution ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
Gamma Rays ◽  
Momentum Distribution ◽  
Angular Distributions ◽  
Distribution Data ◽  
Lifetime Component ◽  
Considerable Uncertainty ◽  
Correlation Data

Both the time spectra and the angular distributions of the annihilation gamma rays have been measured for positrons annihilating in Teflon and polyethylene in an attempt to clarify which annihilation mechanisms account for the various lifetimes in these materials. Some authors have suggested that, in addition to the longest lifetime component, one of the shorter lived components also arises from the pickoff annihilation of orthopositronium. If this were the case, substantially more positronium would be formed than is indicated by the intensity of the longest lived component alone, and should be detectable through a measurement of the intensity of the low momentum portion of the momentum distribution obtained from the angular correlation data. In the present work, four lifetimes are apparent in the time spectra although there is considerable uncertainty in resolving the two shortest components. The angular distribution data, in both cases, yielded a low momentum component whose intensity indicates that only the longest lifetime component arises from pickoff annihilation of orthopositronium. The three shorter lifetime components are discussed.

Estimation of Fermi Surface Parameters from the One-Dimensional Fourier Transform of the Positron Annihilation Angular Correlation Curves

1982 ◽  
Vol 112 (1) ◽  
pp. 231-235 ◽  
Author(s):  
W. Gerber ◽  
W. Hoppe ◽  
O. Brümmer ◽  
G. Dlubek
Keyword(s):  
Fourier Transform ◽  
Fermi Surface ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
Surface Parameters ◽  
One Dimensional ◽  
The One

Angular correlation of positron annihilation radiation from zinc single crystals at 250°C

1968 ◽  
Vol 27 (8) ◽  
pp. 517-519 ◽  
Author(s):  
J.H. Kusmiss ◽  
J.W. Swanson
Keyword(s):  
Single Crystals ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
Annihilation Radiation

Positron Annihilation in Copper Single Crystals and Its Relevance to the Fermi Surface

1968 ◽  
Vol 20 (9) ◽  
pp. 448-450 ◽  
Author(s):  
D. Llewelyn Williams ◽  
Ernest H. Becker ◽  
Peter Petijevich ◽  
Garth Jones
Keyword(s):  
Fermi Surface ◽  
Single Crystals ◽  
Positron Annihilation ◽  
Copper Single Crystals
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