Letter | Published:

Detection of α-Particles in the Disintegration of Thorium

Nature volume 140, page 682 (16 October 1937) | Download Citation



THE nuclear process (nα), that is, the expulsion of an α-particle by a neutron, has hitherto been observed only for light nuclei ; it probably takes place also in the case of heavy, unstable nuclei. Hahn, Meitner1 and Curie, v. Halban and Preiswerk2 assumed the reaction 23290Th (nα) 22988Ra, and the existence of the radium isotope was established by the latter three by chemical identification.

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  1. 1.

    und , Naturwiss., 23, 320 (1935).

  2. 2.

    , and , C.R., 200, 1841 and 2079 (1935); J. Phys., 6, 361 (1935).

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  1. Physikalisches Institut, Eidgenössische Technische Hochschule, Zürich. Aug. 31.

    • A. BRAUN
    • , P. PREISWERK
    •  & P. SCHERRER


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