Emission of Beta-Rays from Substances bombarded with Neutrons


IT is well known that a Geiger-Müller counter placed near a target containing heavy hydrogen gives a large number of responses when the target is bombarded with deuterons of considerable energy. Oliphant1, and later Alexopoulos2, stated that these radiations are unable to induce simultaneous discharges in two thin-walled Geiger-Müller counters placed side by side, and concluded that no gamma-ray of energy higher than 1 × 106 ev. accompanies the D–D reaction. Results contrary to these authors have been obtained repeatedly by us3 using Geiger-Müller counters the walls of which were made of aluminium 0.1 mm. in thickness. But as the energy of the electrons was nearly equal to that of secondary electrons of gamma-rays excited by fast neutrons in several elements, we consider that they might have been due to the gamma-rays excited in several parts of the apparatus by the action of neutrons emitted not only from the target but also possibly from different parts of the accelerating tube bombarded by stray deuteron beams.


  1. 1

    International Conference on Physics (1935), p. 159.

  2. 2

    Helv. Phys. Acta, 8, 601 (1935).

  3. 3

    Proc. Phys.-Math. Soc. Japan, 18, 35 (1936); 18, 115 (1936).

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KIKUCHI, S., AOKI, H. & HUSIMI, K. Emission of Beta-Rays from Substances bombarded with Neutrons. Nature 138, 841 (1936). https://doi.org/10.1038/138841a0

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