Experimental Test of Beta-Ray Theory for the Positron Emitters <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Na</mi></mrow><mrow><mn>22</mn></mrow></msup></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">V</mi></mrow><mrow><mn>48</mn></mrow></msup></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Mn</mi></mrow><mrow><mn>52</mn></mrow></msup></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Co</mi></mrow><mrow><mn>58</mn></mrow></msup></mrow></math>

Wilfred M. Good; David Peaslee; Martin Deutsch

doi:10.1103/PhysRev.69.313

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Experimental Test of Beta-Ray Theory for the Positron Emitters ${Na}^{22}$ , $V^{48}$ , ${Mn}^{52}$ , ${Co}^{58}$

Wilfred M. Good^*, David Peaslee, and Martin Deutsch

Massachusetts Institute of Technology, Cambridge, Massachusetts

^*Based in part upon a thesis submitted by Wilfred M. Good to the faculty of the Massachusetts Institute of Technology in partial fulfillment of the requirements for the degree of Doctor of Philosophy in 1944.

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Phys. Rev. 69, 313 – Published 1 April, 1946

DOI: https://doi.org/10.1103/PhysRev.69.313

Abstract

The positron branching ratio $\frac{λ_{+}}{(λ_{c} + λ_{+})}$ has been measured by a coincidence counting method for four isotopes in which radioactive decay involves competition between positron beta-rays and orbital electron capture. The results are ${}_{11}{Na}^{22}$ : 1.00±0.05, ${}_{23}V^{48}$ : 0.58±0.04, ${}_{25}{Mn}^{52}$ : 0.35±0.02, ${}_{27}{Co}^{58}$ : 0.145±0.005. It is shown that these values, as well as the observed shapes of the beta-ray spectra, and the observed lifetimes are in agreement with predictions of the beta-ray theory for nuclear angular momentum changes $Δ I = 0$ or $Δ I = \pm 1$ . The type of interaction remains uncertain, as does the parity change, except that the scalar interaction gives consistent results if one assumes the parity change in every case except ${Mn}^{52}$ .

References (14)

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M. Deutsch and L. G. Elliott, Phys. Rev. 65, 211 (1944)
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[c1] E. J. Konopinski, Rev. Mod. Phys. 15, 209 (1943)

[c2] J. L. Lawson and J. M. Cork, Phys. Rev. 57, 982 (1940)

[c3] E. J. Konopinski and G. E. Uhlenbeck, Phys. Rev. 60, 308 (1941)

[c4] M. Deutsch and L. G. Elliott, Phys. Rev. 65, 211 (1944)

[c5] W. C. Peacock and M. Deutsch, Phys. Rev. 69, 306 (1946)

[c6] F. Oppenheimer and E. P. Tomlinson, Phys. Rev. 56, 858 (1939)

[c7] H. Maier-Leibnitz, Zeits. f. Physik 122, 233 (1944)

[c8] A. Roberts, L. G. Elliott, J. R. Downing, W. C. Peacock, and M. Deutsch, Phys. Rev. 64, 268 (1943)

[c9] R. Beringer and C. G. Montgomery, Phys. Rev. 61, 222 (1942)

[c10] A. W. Tyler, Phys. Rev. 56, 135 (1939)

[c11] R. E. Marshak, Phys. Rev. 61, 431 (1942)

[c12] E. Greuling, Thesis Indiana University, 1942

[c13] E. Greuling, Phys. Rev. 61, 568 (1942)

[c14] E. L. Hill and R. Landshoff, Rev. Mod. Phys. 10, 106 (1938)

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Experimental Test of Beta-Ray Theory for the Positron Emitters ${Na}^{22}$ , $V^{48}$ , ${Mn}^{52}$ , ${Co}^{58}$

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Experimental Test of Beta-Ray Theory for the Positron Emitters Na22, V48, Mn52, Co58

Abstract

References (14)

Experimental Test of Beta-Ray Theory for the Positron Emitters ${Na}^{22}$ , $V^{48}$ , ${Mn}^{52}$ , ${Co}^{58}$