Effect of positron source irradiation on positronium annihilation in fine powdered alumina

2016 ◽  
Vol 382 ◽  
pp. 10-14 ◽  
Author(s):  
Z.W. Liu ◽  
Z.Q. Chen
Keyword(s):  
Positron Source ◽  
Positronium Annihilation

Optimizing the moderator geometry and thickness for a reactor-based slow positron source

2021 ◽  
Vol 497 ◽  
pp. 39-46
Author(s):  
Raed Alsulami ◽  
Mubarak Albarqi ◽  
Safwan Jaradat ◽  
Shoaib Usman ◽  
Joseph Graham
Keyword(s):  
Positron Source ◽  
Slow Positron

Development of a pure cryogenic positron plasma using a LINAC positron source

1993 ◽  
Vol 76 (1) ◽  
pp. 135-142 ◽  
Author(s):  
T. E. Cowan ◽  
B. R. Beck ◽  
J. H. Hartley ◽  
R. H. Howell ◽  
R. R. Rohatgi ◽  
...  
Keyword(s):  
Positron Source

Phase transitions of CO2confined in nanometer pores as revealed by positronium annihilation

1995 ◽  
Vol 7 (50) ◽  
pp. L713-L717 ◽  
Author(s):  
J A Duffy ◽  
N J Wilkinson ◽  
H M Fretwell ◽  
M A Alam ◽  
R Evans
Keyword(s):  
Phase Transitions ◽  
Positronium Annihilation

scholarly journals SLC positron source-simulation and performance

2002 ◽  
Author(s):  
R. Pitthan ◽  
H. Braun ◽  
J.E. Clendenin ◽  
S.D. Ecklund ◽  
R.H. Helm ◽  
...  
Keyword(s):  
Positron Source ◽  
And Performance

Preliminary Positron Lifetime Results on Free Volumes in Cyclodextrins

2010 ◽  
Vol 666 ◽  
pp. 99-102 ◽  
Author(s):  
Maria Fatima Ferreira Marques ◽  
A.M.G. Moreira Da Silva ◽  
P.M. Gordo ◽  
Z. Kajcsos
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Positron Lifetime ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Positron Source ◽  
Lifetime Component ◽  
Positron Annihilation Lifetime ◽  
Long Lifetime

Positron annihilation lifetime spectroscopy was used to study the free-volume parameters in various pure -, - and -cyclodextrins samples and, in the case of β-cyclodextrin, with inclusion of S-carvone and thymoquinone. The results clearly indicate the presence of long lifetime components related to Ps-formation. The data show that the addition of S-carvone to β-cyclodextrin results in a decrease of o-Ps lifetime that we ascribe to a reduction of free volume holes from 81.8 to 63.7 Å3. The long lifetime component disappears when thymoquinone is added to -cyclodextrin, indicating this substance acts as an o-Ps quencher. For all samples studied, a decrease in the long lifetime component values was observed with increasing source in situ time, a result that might be attributed to the irradiation of the sample by the 22Na positron source.

scholarly journals Opportunities and challenges of a low-energy positron source in the LERF

2018 ◽  
Author(s):  
Stephen Benson ◽  
Bogdan Wojtsekhowski ◽  
Branislav Vlahovic ◽  
Serkan Golge
Keyword(s):  
Low Energy ◽  
Positron Source

scholarly journals Demonstration of a Novel Positron Source Based on a Plasma Wiggler

2006 ◽  
Author(s):  
D. K. Johnson ◽  
I. Blumenfeld ◽  
C. D. Barnes ◽  
C. E. Clayton ◽  
F. J. Decker ◽  
...  
Keyword(s):  
Positron Source
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