Abstract
An investigation is made of the possibility of observing effects of superconductivity on positron thermalization in metals. Energy is calculated as a function of time for a positron which loses energy by exciting quasi-particles out of the BCS ground state of the superconductor. The minimum positron energy observable in annihilation experiments at low temperature is predicted to change sharply if the metal goes from the super-conducting state to the normal state (preferably by applying a magnetic field greater than the critical field). The possible magnitude of the change is estimated to be 6% of the minimum positron energy in the most favorable cases.
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