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The ground-state Gamow-Teller transition in the decay of 14O is stronglyhindered and the electron spectrum deviates markedly from the allowed shape. Areanalysis of the only available data on this spectrum changes the branchingratio assigned to this transition by seven standard deviations: our new resultis (0.54 \pm 0.02)%. The Kurie plot data from two earlier publications are alsoexamined and a revision to their published branching ratios is recommended. Therequired nuclear matrix elements are calculated with the shell model and, forthe first time, consistency is obtained between the M1 matrix element deducedfrom the analog gamma transition in 14N and that deduced from the slope of theshape-correction function in the beta transition, a requirement of theconserved vector current hypothesis. This consistency is only obtained,however, if renormalized rather than free-nucleon operators are used in theshell-model calculations. In the mirror decay of 14C a similar situationoccurs. Consistency between the 14C lifetime, the slope of the shape-correctionfunction and the M1 matrix element from gamma decay can only be achieved withrenormalized operators in the shell-model calculation.Comment: 9 pages; revtex4; one figur

physical review. c. nuclear physics/physical review. c, nuclear physics

New analysis of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>14</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>β decay: Branching ratios and conserved vector current consistency

New analysis ofO14β decay: Branching ratios and conserved vector current consistency