Nuclear mismatch in super-allowed Fermi beta-decay
نویسندگان
چکیده
منابع مشابه
Super-allowed Fermi beta-decay: Vale!
A final analysis of Jπ = 0+ → 0+ super-allowed Fermi transitions yields |Vud| = 0.9500±0.0007; |Vud|+ |Vus|+ |Vub| = 0.9999±0.0011 with the operational vector coupling constant GV /(h̄c) 3 = (1.15052 ± 0.00021) × 10−5 GeV−2.
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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 ...
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Superallowed 0 → 0 nuclear beta decay provides a direct measure of the weak vector coupling constant, GV. We survey current world data on the nine accurately determined transitions of this type, which range from the decay of C to that of Co, and demonstrate that the results confirm conservation of the weak vector current (CVC) but differ at the 98% confidence level from the unitarity condition ...
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Precision studies of superallowed beta decay are used to determine the Cabibbo-KobayashiMaskawa (CKM) matrix element Vud and to study the matrix’s unitarity. To reach this goal, however, the experimental β-decay rates need to be corrected for radiative and isospin-symmetry-breaking effects. The radiative correction, which in total is around 4%, is conveniently divided into terms that are nucleu...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 1995
ISSN: 0375-9474
DOI: 10.1016/0375-9474(95)00017-u