The Beta-Ray Spectra of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>64</mn></mrow></msup></mrow></math></span> at Low Energies

John Backus

doi:10.1103/PhysRev.68.59

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The Beta-Ray Spectra of ${Cu}^{64}$ at Low Energies

John Backus^*

Radiation Laboratory, University of California, Berkeley, California

^*At University of Southern California, Los Angeles, California, after November 1, 1945.

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Phys. Rev. 68, 59 – Published 1 August, 1945

DOI: https://doi.org/10.1103/PhysRev.68.59

Abstract

An electrostatic beta-ray spectrometer has been constructed utilizing the focusing action of the electric field between concentric cylindrical conductors. A Geiger tube counter using an argon-alcohol mixture was used; a technique for making windows for the counter was developed whereby electrons of energies as low as 5 kev could be counted. A source of radioactive ${Cu}^{64}$ was mounted on a very thin collodion film in order to eliminate the effects of back scattering. The positron and electron spectrum of ${Cu}^{64}$ was plotted with the apparatus in the region below 50 kev. It was found that the ratio of the number of positrons to the number of electrons in this region did not agree with the number predicted by the Fermi theory of beta-disintegration.

References (9)

A. Flammersfeld, Zeits. f. Physik 112, 727 (1939)
A. W. Tyler, Phys. Rev. 56, 125 (1939)
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[c1] A. Flammersfeld, Zeits. f. Physik 112, 727 (1939)

[c2] A. W. Tyler, Phys. Rev. 56, 125 (1939)

[c3] S. N. Van Voorhis, Phys. Rev. 50, 895 (1936)

[c4] E. Fermi, Zeits. f. Physik 88, 161 (1934)

[c5] A. L. Hughes and V. Rojansky, Phys. Rev. 34, 284 (1929)

[c6] N. S. Gingrich, Rev. Sci. Inst. 7, 207 (1936)

[c7] H. V. Neher and W. W. Harper, Phys. Rev. 49, 940 (1936)

[c8] J. Steigman, Phys. Rev. 53, 771 (1938)

[c9] E. J. Konopinski and G. E. Uhlenbeck, Phys. Rev. 48, 7 (1935)

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The Beta-Ray Spectra of ${Cu}^{64}$ at Low Energies

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The Beta-Ray Spectra of Cu64 at Low Energies

Abstract

References (9)

The Beta-Ray Spectra of ${Cu}^{64}$ at Low Energies