Elsevier

Nuclear Physics A

Volume 518, Issues 1–2, 5–12 November 1990, Pages 138-148
Nuclear Physics A

14O and friends see the quarks

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Abstract

It is likely that quarks will not show up in studies of nuclear structure and associated reaction mechanisms but their influence can be evidenced through the radiative correction to the super-allowed Fermi (vector) beta-decay transitions of the series of eight accurately measured bodies from 14O to 54Co. Assuming unitarity of the Kobayashi-Maskawa matrix at the level of three generations, semi-leptonic K-meson and hyperon decays, corrected for SU(3) symmetry-breaking, determine the rate of nuclear vector beta-decay, without radiative corrections, in terms of the rate of muon decay; comparison with the experimental nuclear decay rates then determines the magnitude of their radiative correction which may be analyzed, following Marciano and Sirlin, in terms of the number of quarks per nuclcon: one finds 2.8 ± 0.6.

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