Influence of Temperature on the Groups of Slow Neutrons

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WE have investigated the influence of temperature on the activation of silver by slow neutrons, separating the effects due to the groups A, B and C as defined by Amaldi and Fermi1. The arrangement used is shown in plan in Fig. 1. Absorbers of cadmium (0.258 gm./cm.2) and silver (0.077 gm./cm.2) were employed to separate the groups, and the use of a thicker absorber of silver (1.023 gm./cm.2) enabled changes in the absorption coefficients of groups B and C in silver to be measured. For the low temperatures the paraffin wax was cooled with liquid nitrogen or hydrogen. The results obtained were as follows:

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  1. 1

    Ric. Scient., (ii), 6, 344 and 443 (1935); (i), 7, 454 (1936).

  2. 2

    Amaldi and Fermi, loc. cit.; Frisch and Placzek, NATURE, 137, 357 (1936); Weeks, Livingstone and Bethe, Phys. Rev., 49, 471 (1936).

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