Published online by Cambridge University Press: 24 October 2008
Measurements have been made on the proportion of the effect induced in silver which is due to neutrons strongly absorbed by cadmium, using cylinders of water and boric acid of different sizes to slow down the neutrons. In addition to furnishing data for use in the foregoing paper, the results show that practically all the neutrons of groups A and B must have energies greater than any of those of group C.
The author desires to thank Lord Rutherford for his interest in the work and for the use of a Ra + Be source, and Dr Oliphant for discussion and advice. He is also indebted to the Department of Scientific and Industrial Research for a Senior Research Award.
* Proc. Roy. Soc. A, 150 (1935), 709.Google Scholar
† Ric. Sci. 6 (ii) (1935), 344, 443, and 7 (i) (1936), 454;Google ScholarPhys. Rev. 50 (1936), 899.Google Scholar
‡ Kurtschatow, and Shchepkin, , Phys. Zeits. d. Sowjet. 9 (1936), 102;Google ScholarMitchell, , Rasetti, , Fink, , and Pegram, , Phys. Rev. 50 (1936), 189.CrossRefGoogle Scholar
* Amaldi and Fermi, loc. cit.; Frisch, and Placzek, , Nature, 137 (1936), 357;CrossRefGoogle ScholarWeeks, , Livingstone, , and Bethe, , Phys. Rev. 49 (1936), 471.CrossRefGoogle Scholar
* Nature, 138 (1936), 462.Google Scholar