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

T. E. Cowan; B. R. Beck; J. H. Hartley; R. H. Howell; R. R. Rohatgi; J. Fajans; R. Gopalan

doi:10.1007/bf02316712

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

Hyperfine Interactions ◽

10.1007/bf02316712 ◽

1993 ◽

Vol 76 (1) ◽

pp. 135-142 ◽

Cited By ~ 11

Author(s):

T. E. Cowan ◽

B. R. Beck ◽

J. H. Hartley ◽

R. H. Howell ◽

R. R. Rohatgi ◽

...

Keyword(s):

Positron Source

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

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms ◽

10.1016/j.nimb.2021.04.005 ◽

2021 ◽

Vol 497 ◽

pp. 39-46

Author(s):

Raed Alsulami ◽

Mubarak Albarqi ◽

Safwan Jaradat ◽

Shoaib Usman ◽

Joseph Graham

Keyword(s):

Positron Source ◽

Slow Positron

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SLC positron source-simulation and performance

Conference Record of the 1991 IEEE Particle Accelerator Conference ◽

10.1109/pac.1991.164878 ◽

2002 ◽

Cited By ~ 1

Author(s):

R. Pitthan ◽

H. Braun ◽

J.E. Clendenin ◽

S.D. Ecklund ◽

R.H. Helm ◽

...

Keyword(s):

Positron Source ◽

And Performance

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Preliminary Positron Lifetime Results on Free Volumes in Cyclodextrins

Materials Science Forum ◽

10.4028/www.scientific.net/msf.666.99 ◽

2010 ◽

Vol 666 ◽

pp. 99-102 ◽

Cited By ~ 3

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.

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