Positrons from the Decay of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">P</mi></mrow><mrow><mn>32</mn></mrow></msup></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Y</mi></mrow><mrow><mn>90</mn></mrow></msup></mrow></math></span>

Jack S. Greenberg; Martin Deutsch

doi:10.1103/PhysRev.102.415

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Positrons from the Decay of $P^{32}$ and $Y^{90}$

Jack S. Greenberg^* and Martin Deutsch

Department of Physics and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts

^*At present at the Eidgenossische Technische Hochschule, Zurich, Switzerland.

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Phys. Rev. 102, 415 – Published 15 April, 1956

DOI: https://doi.org/10.1103/PhysRev.102.415

Abstract

A magnetic focusing arrangement is combined with coincidence counting of the annihilation radiation to permit detection of very low positron intensities in the presence of other radiations. Sources of $P^{32}$ yielded (7.5±2)× $10^{- 10}$ positrons per beta decay. An experiment with a gold-covered source showed that secondary effects in the source material may contribute an important fraction of these positrons. One may conclude that the number of positrons per beta decay of $P^{32}$ does not exceed by more than a factor two the value 5.5× $10^{- 10}$ expected theoretically from electromagnetic effects and is probably close to the theoretical value.

Sources of $Y^{90}$ emit (3.6±0.9)× $10^{- 5}$ positrons per beta decay, due primarily to the 1.75-Mev electric monopole transition in ${Zr}^{90}$ .

References (16)

Colloquium on Nuclear Effects of the Electron Cloud (Paris 1954), the proceedings of which appear in J. phys. radium 16, 497 (1955)
N. Arley and C. Møller, Kgl. Danske Videnskab. Selskab, Mat.-fys. Medd. 15, 9 (1938)
L. Tisza, Physik Z. Sowjetunion 11, 425 (1937)
K. Huang, following paper [Phys. Rev. 102, 422 (1956)]
G. Groetzinger and F. Ribe, Phys. Rev. 87, 1003 (1952)
G. W. McClure, Phys. Rev. 94, 1637 (1954)
P. Weinzierl, Z. Naturforsch. 9A, 69 (1954)
G. Groetzinger and D. Kahn, Phys. Rev. 80, 108 (1950)
T. Yuasa, Compt. rend. 234, 619 (1954)
H. Bradt, Helv. Phys. Acta 17, 59 (1954)
K. Siegbahn and H. Slätis, Arkiv. Mat. Astron. Fysik 34A, 6 (1947)
W. Heitler, Quantum Theory of Radiation (Oxford University Press, Oxford, 1944)
H. J. Bhabha, Proc. Roy. Soc. (London) A152, 559 (1935)
Omitted endnote
Johnson, Johnson, and Langer, Phys. Rev. 98, 1517 (1955)
P. Thomas, Phys. Rev. 58, 714 (1940)

[c1] Colloquium on Nuclear Effects of the Electron Cloud (Paris 1954), the proceedings of which appear in J. phys. radium 16, 497 (1955)

[c2] N. Arley and C. Møller, Kgl. Danske Videnskab. Selskab, Mat.-fys. Medd. 15, 9 (1938)

[c3] L. Tisza, Physik Z. Sowjetunion 11, 425 (1937)

[c4] K. Huang, following paper [Phys. Rev. 102, 422 (1956)]

[c5] G. Groetzinger and F. Ribe, Phys. Rev. 87, 1003 (1952)

[c6] G. W. McClure, Phys. Rev. 94, 1637 (1954)

[c7] P. Weinzierl, Z. Naturforsch. 9A, 69 (1954)

[c8] G. Groetzinger and D. Kahn, Phys. Rev. 80, 108 (1950)

[c9] T. Yuasa, Compt. rend. 234, 619 (1954)

[c10] H. Bradt, Helv. Phys. Acta 17, 59 (1954)

[c11] K. Siegbahn and H. Slätis, Arkiv. Mat. Astron. Fysik 34A, 6 (1947)

[c12] W. Heitler, Quantum Theory of Radiation (Oxford University Press, Oxford, 1944)

[c13] H. J. Bhabha, Proc. Roy. Soc. (London) A152, 559 (1935)

[c14] Omitted endnote

[c15] Johnson, Johnson, and Langer, Phys. Rev. 98, 1517 (1955)

[c16] P. Thomas, Phys. Rev. 58, 714 (1940)

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Positrons from the Decay of $P^{32}$ and $Y^{90}$

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Positrons from the Decay of P32 and Y90

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References (16)

Positrons from the Decay of $P^{32}$ and $Y^{90}$