Abstract
IN a previous note1, we reported measurements of the relative probability of emission of electron-positron pairs from the excited state of O16 at 5.9 MeV. as a function of the angle between directions of emission of positron and electron. The results of these measurements are, at least approximately, in agreement with the assumption that the transition occurs between two states of the O16 nucleus with zero angular momentum and even parity, and is essentially electromagnetic in nature. The absolute probability (that is, the life-time) of such a transition depends on more detailed properties of the two nuclear states involved, although the indication that the process is of an electromagnetic type suggests a value more closely comparable with the short life-times for Î-radiative transitions, rather than the longer times typical of Î-decay processes.
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References
Devons and Lindsey, Nature, 164, 539 (1949).
Blackett and Lees, Proc. Roy. Soc., A, 134, 658 (1932).
Dalitz (unpublished calculations).
Feenberg, Rev. Mod. Phys., 19, 239 (1947).
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DEVONS, S., HEREWARD, H. & LINDSEY, G. Life-Time for Pair Emission by Spherically Symmetrical Excited State of the O16 nucleus. Nature 164, 586–587 (1949). https://doi.org/10.1038/164586b0
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DOI: https://doi.org/10.1038/164586b0
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