Abstract
I. CURIE, Joliot and Preiswerk1 have shown that by bombarding silicon and phosphorus by neutrons there are produced radio-elements which spontaneously emit neutrons, in addition to electrons (Fermi effect), positrons and -rays. Thus an entirely new type of radioactivity has been discovered by them.
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References
C.R., 198, 2089; 1934.
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GUREVICH, I. Spontaneous Emission of Neutrons by Radio-elements. Nature 135, 956–957 (1935). https://doi.org/10.1038/135956b0
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DOI: https://doi.org/10.1038/135956b0
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