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The electron-capture (EC) decay rate of 7Be in metallic Cu host and thebeta-decay rate of 198Au in the host alloy Al-Au have been measuredsimultaneously at several temperatures, ranging from 0.350 K to 293 K. Nodifference of the half-life of 198Au between 12.5 K and 293 K is observed to aprecision of 0.1%. By utilizing the special characteristics of ourdouble-source assembly, possible geometrical effects that influence theindividual rates could be eliminated. The ratio of 7Be to 198Au activity thusobtained also remains constant for this temperatures range to the experimentalprecision of 0.15(0.16)%. The resulting null temperature dependence isdiscussed in terms of the inadequacy of the often-used Debye-Huckel model forsuch measurements.

Absence of low-temperature dependence of the decay of 7Be and 198Au in metallic hosts