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Positron Annihilation in γ-Irradiated Amorphous Iron Alloys

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Mikhalenkov V., Chernyashevskii A., Shalaev A.
Acta Physica Polonica A
|
1993
|
vol. 83
|
issue 3
359-363
EN
One-dimensional angular correlation of annihilation radiation was measured in a series of amorphous (Fe_{100-x}Cr_{x})_{85}B_{15} alloys (x = 0-32) exposed to γ-irradiation from intensive ^{60}Co source. The relevant shape parameters were compared with those in non-irradiated alloys. Irradiation-induced changes of those parameters were found to depend on Cr contents x. The opposite signs of these changes were observed in x < 4 and x > 4 ranges, while near x = 4 the parameters stayed unchanged. We try to interpret the results assuming that γ-quanta are able to knock out boron atoms from their positions into large cavities, thus preventing positron trapping. The crystalline embryos model of amorphous alloys suggested by Hamada and Fujita is also used for explanation of the observed effects.
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