Time bunching of slow positrons for annihilation lifetime and pulsed laser photon absorption experiments

Abstract

Methods are described for gathering positrons from an extended region and causing them to impact upon a target surface within a small time interval. The most optimistic of these proposed schemes suggests that one should be able to produce ∼10⁻⁹s positron pulses with peak intensities of ∼10¹¹s⁻¹ starting with a ∼200 m Ci⁵⁸Co β⁺ source. These pulses should be useful for studying time-dependent interactions of positrons at surfaces.