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The upper limit of energy in the β-ray spectrum of thorium C″

Published online by Cambridge University Press:  24 October 2008

F. R. Terroux  and
N. S. Alexander
F. R. Terroux
Affiliation:
1851 Exhibition Scholar and External Research Student of Emmanuel College
N. S. Alexander
Affiliation:
Trinity College
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Extract

The upper portion of the β-ray spectrum of thorium C″ has been investigated by measuring the tracks produced in a Wilson chamber. No trace of a “tail“ is found, no tracks of Hρ greater than 10,800 being observed in some 600 to 800 disintegrations. The end-point is placed at 9400 Hρ, somewhat higher than the value obtained by other workers.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 28 , Issue 1 , January 1932 , pp. 115 - 120
Copyright
Copyright © Cambridge Philosophical Society 1932

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References

* Proc. Roy. Soc. vol. 131, p. 90 (1931)Google Scholar. It is possible that the number of tracks of energies greater than 1,070,000 electron-volts has been over-estimated, since, with the comparatively low magnetic fields employed in this work, the radius of curvature of a fast track is great, and slight nuclear or multiple electron scattering would introduce considerable errors in the determination of energy.

† Proc. Roy. Soc. vol. 112, p. 380 (1926).Google Scholar

‡ Proc. Roy. Soc. vol. 109, p. 166 (1925).Google Scholar

§ Proc. Camb. Phil. Soc. vol. 23, p. 982 (1927).Google Scholar

* Proc. Camb. Phil. Soc. vol. 25, p. 331 (1929).Google Scholar

† Terroux (loc. cit.). See also Williams, and Terroux, , Proc. Roy. Soc. vol. 126, p. 289 (1930).CrossRefGoogle Scholar

* Phys. Soc. Proc. vol. 42, p. 212 (1930).Google Scholar

* Comptes rendus, vol. 180, p. 202 (1925).Google Scholar