Isothermal Annealing of Deuteron-Irradiated Al and Au below 60°K

Foils, made out of 99.999% pure Al (4 mil) and 99.999% pure Au (2 mil), are bombarded with 21-Mev deuterons at a temperature not exceeding 8.5 nif- K. With a total flux of 2.5 x 10/sup 16/ d/cm/sup 2/, the damage introduced is 0.33 x 10/sup -7/ ohmcm and 0.45 x 10/sup -7/ ohm-cm, respectively, about five times smaller than the theoretical value. For Au the 1/E law forthe damage production holds. No radiation annealing is observed for either metal. Isothermal annealing is performed in steps of 1 nif- K for one hour at each temperature. Up to 50 nif- K 65% of the danmage anneals out in Al, 17% in Au. The isochronal plot of the resistance decrease for Al shows a small peak (5%) centered at 17 nif- K, a large one at 34 nif- K, and two at 39 and 46 nif- K. The annealing in Au, appreciable already at the lowest annealing temperature, 9.7 nif- K, is rather constant over the whole temperature range examined except for a large peak at 33 nif- K and a smaller one at 45 nif- K. Changes in the temperature-dependent part of the resistivity can for both metals be explainedmore » as a deviation from Mathiessen's rule, as resistance measurements at 6 nif- K indicate. This result is in agreement with measurements on Al and Au alloys. The activation energy spectrum for Al, obtained with a frequency factor of InB = 29, shows also 4 peaks, at rather complex, because of the large range of the interaction of defects and the anisotropy of this metal. A recalculation of data for the annealing of deuteron-irradiated Cu and Ag shows a fine structure. A way to choose the proper temperature increase for isothermal annealing measurements is given. (auth)« less

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