Standard-model tests with superallowed beta decay: Nuclear data applied to fundamental physics
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The study of superallowed nuclear decay currently provides the most precise and convincing confirmation of the conservation of the vector current (CVC) and is a key component of the most demanding available test of the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, a basic pillar of the Electroweak Standard Model. Experimentally, the Q-value, half-life, and branching ratio for superallowed transitions must be determined with a precision better than 0.1%. This demands metrological techniques be applied to short-lived (1 s) activities and that strict standards be employed in surveying the body of world data. The status of these fundamental studies is summarized and recent work described. 2005 American Institute of Physics.
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INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY