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Some Experiments with Neutrons slowed down at different Temperatures

Published online by Cambridge University Press:  24 October 2008

C. H. Westcott  and
H. Niewodniczanski
C. H. Westcott
Affiliation:
Queens' College
H. Niewodniczanski
Affiliation:
Cavendish and Royal Society Mond Laboratories
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Extract

Experiments are described comparing the effects of neutrons slowed down in paraffin wax at the temperatures of liquid nitrogen and liquid hydrogen with those obtained at ordinary temperatures. It is found that the absorption produced by certain substances increases as the temperature is lowered. The transformations produced in these substances also increase, but generally to a smaller extent, probably owing to more neutrons being absorbed in the paraffin: the exact figure depends on the thickness of the layer of cooled paraffin.

A few experiments were also made substituting liquid hydrogen for paraffin wax (without change of temperature). The effect of this also appears to depend on the thickness of the layer, but it is not yet possible to draw definite conclusions.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 31 , Issue 4 , October 1935 , pp. 617 - 624
Copyright
Copyright © Cambridge Philosophical Society 1935

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References

* Amaldi, , D'Agostino, , Fermi, , Pontecorvo, , Rasetti, and Segrè, , Proc. Roy. Soc. A, 149 (1935), 522.CrossRefGoogle Scholar

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‡ Loc. cit.

§ Nature, 135 (1935), 904.Google Scholar

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Amaldi, , Fermi, , and others, La Ricerca Scientifica, (6), 1 (1935), no. 11–12.Google Scholar

* Bjerge and Westcott, loc. cit.

* In some preliminary experiments we were unable to detect any increase of activity at low temperatures on the inner surface of a cylinder of silver 0·5 mm. thick, owing to the increased absorption of the neutrons in the sample itself.

† Loc. cit.

* Nature, 136 (1935), 66.Google Scholar