An investigation of positrons interacting with solid argon, krypton and xenon Page: 2 of 19
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With this article we intend to shed some light on all the important characteristics of the
up-to-date most efficient positron moderators, the rare gas solids. We stress on the
importance of the impurities in the performance of the solid rare gas moderators. The
impurity factor is linked with the crystalline changes to explain the effect of annealing,
and demonstrate the role of impurities in the endurance. Significant increase in the low
energy positron yield is observed after repeated anneals. The positron energy distributions
from Ar, Kr, and Xe moderators are measured to be about 2 eV (FWHM).
Key words: positron beam, moderators, solid rare gases, impurity
PACS: 78.70.Bj, 61.72.Ss, 78.50.-w
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Petkov, M.P.; Roellig, L.O. & Troev, T.D. An investigation of positrons interacting with solid argon, krypton and xenon, report, October 1, 1996; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc683119/m1/2/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.