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Test of the nature of the vector interaction in β decay

Gell-Mann, Murray (1958) Test of the nature of the vector interaction in β decay. Physical Review, 111 (1). pp. 362-365. ISSN 0031-899X.

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An experiment is proposed to test the theory recently advanced by Feynman and Gell-Mann on the vector interaction in β decay. According to the theory, the Fermi coupling constant is not appreciably altered by renormalization, in agreement with experiment. A further property of the theory is exploited here, that analogous γ and β transitions in light nuclei have proportional matrix elements, as far as the V interaction is concerned. In particular, the V interaction gives rise to "weak magnetism" analogous to the magnetic effects that induce the emission of M1 photons. This "weak magnetism" obeys Gamow-Teller selection rules and interferes with the A coupling, distorting the spectra of high-energy β transitions with ΔJ=1 (no). It is suggested that the β spectra of B12 and N12 be measured accurately and compared. Departure from linearity of the Kurie plot should be noticed in each case; the ratio of the spectra can be calculated with confidence on the basis of the theory, which predicts a 20% effect. The measured γ-ray width of the 15.11-Mev state in C12 is used in the calculation.

Item Type:Article
Additional Information:©1958 The American Physical Society. Received 3 March 1958. It is a pleasure to acknowledge the value of conversations with F. Boehm, R. P. Feynman, W. A. Fowler, Thos. Lauritsen, B. Stech, and especially A. Wattenberg, who asked a question that sparked this investigation. Work supported by the Alfred P. Sloan Foundation, Inc., and the U. S. Atomic Energy Commission.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4563
Deposited By: Tony Diaz
Deposited On:29 Aug 2006
Last Modified:26 Dec 2012 09:00

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