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The electric resistivity changes induced by the 12-Mev deuteron bombardment of Cu, Ag, Au, Ni, and Ta foils were determined as functions of the integrated flux. Bombardments were carried out at about -140°C and -150°C, and differences in the two sets of measurements were traced to a thermal recovery process which was proceeding with measurable velocity even at -165°C. This low temperature reaction was characterized by an activation energy of 0.2, ±0.05 ev for Cu, Ag, and Au, and one of 0.3, ±0.1 ev for Ni and Ta. It is suggested that the migration of vacancy pairs offers a reasonable model for the initial recovery process, although other mechanisms are also discussed.

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