Letter | Published:

Induced Positron Radioactivity

Nature volume 134, pages 288289 (25 August 1934) | Download Citation



RADIOACTIVITY induced by proton, diplon, neutron and particle bombardment can be explained on the hypothesis that the nuclear structure of stable isotopes consists of particles, neutrons and diplon. Missing isotopes of mass number less than twice the atomic number contain, on this theory, a free proton in addition to the other nuclear components1. Such nuclei are unstable and radioactive, emitting positrons. They may be produced artificially by bombarding appropriate stable isotopes with protons, diplons or particles but, being short-lived, have not at present been detected. These positron radioactive isotopes will only be found among elements below scandium in the periodic table, and are of the structural type, for example, 7N13 (3 + p), 6C11 (2 + D + p), 15P30 (7 + p + n).

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  1. 1.

    See , Phil. Mag., 18, 156; 1934.

  2. 2.

    Proc. Roy. Soc., A, 144, 692; 1934.

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  1. Washington Singer Laboratories, Exeter. July 24.

    • F. H. NEWMAN
    •  & H. J. WALKE


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