Abstract
INVESTIGATIONS of the radiations from the artificially active elements have been made with the help of the lens β-spectrograph, previously described1. It is of special interest to examine the β-spectra from the light elements, which, on account of their positions in the Sargent diagram, are due to permitted transitions. Among those elements there are only two, which, considering the short half-lives we have to deal with here, can be investigated with such an accuracy as to permit any conclusion, namely, carbon C11 and nitrogen N13. Of these elements C11 has already been the subject of an investigation with the lens-spectrograph2. Nitrogen3 is of special interest because of the fact that several authors4 have found that the positron radiation is accompanied by a γ-radiation, caused by a complexity in the β+-spectrum. On the other hand, some investigators5 have not been able to detect this γ-radiation.
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References
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SIEGBAHN, K., SLÄTIS, H. Radioactivity of Active Nitrogen. Nature 156, 568–569 (1945). https://doi.org/10.1038/156568a0
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DOI: https://doi.org/10.1038/156568a0
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