Abstract
The single escape (SE) peak in a Ge(Li) detector is shown to be wider than either a double escape or a full energy peak of the same pulse height. The extra width arises from Doppler broadening of the annihilation energy and is determined by the electron momentum distribution in germanium. In addition the centroid of an SE peak in a coaxial detector is Doppler shifted to higher energies because of the positron's mobility in the electric field in the detector. These effects necessitate caution in the use of SE peaks in energy measurements and system linearity tests, and in extraction of Fano factor or nuclear lifetime from linewidth measurements.
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