Abstract
The measurement of three-photon annihilation of positrons could provide not only an enhanced specificity in the determination of elements that have positron emitters as products, but also chemical (state) information on the environment of that element in the sample. The tree-photon yields have been determined for several compounds containing copper, in addition to the pure metal and a few alloys. The observations have been corraborated by angular correlation and Doppler broadening measurements and further substantiated by magnetic quenching in the angular correlation measurements.
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