Effect of Nucleon Structure Variation in Super-allowed Fermi Beta-decay

Abstract

There is a well known anomaly between the value of the Fermi decay constant extracted from super-allowed Fermi beta-decay of nuclear isotriplets and that required by unitarity of the Cabibbo-Kobayashi-Maskawa matrix. This discrepancy remains at the level of a few tenths of a percent after the most rigorous investigation of conventional nuclear and radiative corrections. Within the framework of the quark-meson coupling model of nuclear matter, which has been previously applied successfully to phenomena such as nuclear saturation and nuclear charge symmetry violation, we show that it is possible to understand a significant fraction of the observed anomaly.

11 pages with 1 figure and 1 table

References in corpus (3)

• A quark-meson model for nuclear and neutron matter
• The Nolen-Schiffer anomaly and isospin symmetry breaking in nuclear matter
• Quenching of spin operators in the calculation of radiative corrections for nuclear beta decay

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