Abstract
IN connexion with the discovery of the transuranic element 93Np239, McMillan and Abelson1 report h 0·47 MeV. as the upper energy limit of the β-spectrum. The γ-radiation was found to be complex and the energy less than 0·3 MeV. Philipp, Riedhammer and Wiedemann23 studied the β-spectrum of Np239 photo-graphically by means of the semicircular method. They found ten internal conversion lines. Eight of them were interpreted as the K-, L- and.M-lines of three nuclear γ-radiations of the energies 208, 226 and 276 keV., two lines as the L- and M-lines of a Kα-radiation. The results are reproduced in the accompanying table. Later, Philipp and Riedhammer4 reported that the β-spectrum is a single one and that the β-decay is connected also with a 500 keV. γ-radiation. Recently, Feather and Krishnan5 investigated the radiation from U239 by absorption measurements. They found, in the main, a single β-spectrum and give the value 1·20 MeV. for the upper energy limit. A γ-radiation of 76 keV. energy and another of at least 300 keV. were also observed.
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References
McMillan, E., and Abelson, P. H., Phys. Rev., 57, 1185 (1940).
Philipp, K., and Riedhammer, J., Naturwiss., 32, 216 (1944).
Philipp, K., Riedhammer, J., and Wiedemann, M., Naturwiss., 32, 230 (1944).
Philipp, K., and Riedhammer, J., Z. Naturforsch., 1, 372 (1946).
Feather, N., and Krishnan, R. S., Proc. Camb. Phil. Soc., 43, 267 (1947).
Melander, L., Acta Chem. Scand., 1, 169 (1947).
Siegbahn, K., Phil. Mag., 37, 162 (1946).
SlÃtis, H., Arkiv Mat., Astr. Fysik, in the press.
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SLATIS, H. β- and γ-Radiation from U239 and Np239. Nature 160, 579–580 (1947). https://doi.org/10.1038/160579a0
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DOI: https://doi.org/10.1038/160579a0
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