Abstract
WHEN lithium is bombarded by protons of energy of about 450 kV., gamma rays of about 17.5 × 106 eV. energy are emitted. Recently Bothe and Gentner1 have observed that these gamma rays can produce radioactivity in many elements. In all the cases reported, the primary process probably consists in the emission of photo-neutrons. In six cases they have observed the formation of new radioactive isotopes. These are gallium (60 min.), bromine (5 min.), silver (24 min.), indium (1 min.), antimony (13 min.) and tantalum (14 min.).
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References
Bothe and Gentner, Naturwiss., 25, 90, 126, 191, 284 (1937).
Heyn, NATURE, 138, 723 (1936). Physica, 4, 160 (1937).
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CHANG, W., GOLDHABER, M. & SAGANE, R. Radioactivity Produced by Gamma Rays and Neutrons of High Energy. Nature 139, 962–963 (1937). https://doi.org/10.1038/139962a0
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DOI: https://doi.org/10.1038/139962a0
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