Abstract
Theoretical positron lifetime values have been calculated systematically for most of theelements of the periodic table. Self-consistent and non-self-consistent schemes have beenused for the calculation of the electronic structure in the solid, as well as differentparametrizations for the positron enhancement factor and correlation energy. The resultsobtained have been studied and compared with experimental data, confirming thetheoretical trends. As is known, positron lifetimes in bulk show a periodic behaviour withatomic number. These calculations also confirm that monovacancy lifetimes follow the samebehaviour. The effects of enhancement factors used in calculations have been commentedupon. Finally, we have analysed the effects that f and d electrons have on positronlifetimes.
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