Abstract
THE number of different radio-isotopes seems in several cases greater than can be explained by attributing to each of them a different mass-number. In particular, bromine irradiated with neutrons, γ-rays and deuterons gives four radio-isotopes (T = 7 min., 18 min., 250 min. and about 36 h.); and it seems that two of them, namely, the isotopes with T = 18 min. and T = 250 min., must have the same mass-number 801). These facts, together with some others, have led several authors to assume the existence of isomeric nuclei.
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References
Bothe, W., and Gentner, W., Z. Phys., 106, 236 (1937).
Fleischmann, R., Z. Phys., 107, 205 (1937).
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SOÅTAN, A., WERTENSTEIN, L. Isomeric Radio-Isotopes of Bromine. Nature 141, 76 (1938). https://doi.org/10.1038/141076a0
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DOI: https://doi.org/10.1038/141076a0
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