Abstract
The heat release from polycrystalline copper (oxygen-free, 4N purity) after cooling toT=1.3 K was measured in a calorimeter with a parasitic heat leak of about 1.5 pW/g. Its relaxation and the dependence of the total heat released on the temperature of the specimen before cooling to 1.3 K agree well with the hypothesis of the ortho-para conversion of molecular hydrogen precipitated in copper and behaving as free hydrogen. A temperature dependence of the relaxation time and an additional “fast” heat release just after cooling were observed.
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