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High-Precision Half-Life Measurements for the Superallowed Fermi Beta Emitters 14O and 18Ne

By Alex Laffoley

When 2015-11-17
from 11:30 am à 12:30 pm
Where Salle 105
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The study of superallowed Fermi β transitions between nuclear isobaric analogue states of spin 0+ provides demanding, and fundamental, tests of the properties of the electroweak interaction. These studies, which include some 200+ individual measurements, have been used to test the conserved vector current hypothesis, set limits on weak scalar currents, test the unitarity of the Cabibbo-Kobayashi-Maskawa quark mixing matrix, and set limits on physics beyond the Standard Model.
A series of high-precision half-life measurements for the superallowed Fermi β emitters 14O and 18Ne were performed at the Isotope Separator and Accelerator Facility at TRIUMF. For each nucleus, 2 independent high-precision half-life measurements were made resulting in systematic self-consistent tests of the analysis methods. The precise half-life measurements for 14O and 18Ne reported here can be combined with the respective branching ratio and Q value measurements for these isotopes in order to determine the ft values for these superallowed Fermi β transitions.

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