Internal Pair Emission from Aligned Nuclei

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Abstract
The general correlation function describing the emission of positron-electron pairs from aligned nuclei is obtained from a plane-wave calculation. Results are presented and discussed for pure magnetic and pure electric transitions and for mixed transitions. It is assumed that the emitting state, although aligned, is unpolarized and that the polarization of neither member of the pair is observed. The dependence of internal pair emission on the nuclear alignment is compared with that of the competing gamma radiation. The behavior of the correlation function in the high-energy limit is also discussed.