Letter | Published:

Scattering of Hard γ-Rays and Annihilation Radiation

Nature volume 135, page 266 (16 February 1935) | Download Citation



To determine the relative importance of the annihilation of positive electrons in the phenomenon of the scattering of hard γ-rays, observations were made on the secondary γ-radiation from thin lead foils irradiated with thorium C γ-rays (25 mgm.). With a scattering angle of about 140°, 0.8 cm. effective lead filter was sufficient to absorb practically all the Compton scattering, and still leave predominant the softer of the two components in the anomalous scattering, namely, the component which has been attributed to the annihilation of positive electrons.

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  1. 1.

    Cf. earlier experiments by the writer using O.1 mm. lead foil and radium C -rays (NATURE, 133, 415; 1934).

  2. 2.

    Z. Phys., 88, 683; 1934.

  3. 3.

    and , Phys. Rev., 44, 53 ; 1933. and , Proc. Roy. Soc., 146, 83; 1934.

  4. 4.

    Phys. Rev., 46, 80 ; 1934.

  5. 5.

    To be published in the Physical Review. These authors have also considered other possible effects, including the Raman scattering of the primary radiation, and found them to be unimportant.

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  1. Institute for Theoretical Physics, Copenhagen. Jan. 12.

    • E. J. WILLIAMS


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