A measurement of the half-life of the superallowed Fermi decay and a study of some systematic errors involved

Barker, P.H.; Sofield, C.J.; Petty, R.J.; Freeman, J.M.; Hoath, S.D.; Burcham, W.E.; Squier, G.T.A.

doi:10.1016/0375-9474(77)90273-1

Cited by 20 publications

(14 citation statements)

References 11 publications

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“…All four values are statistically consistent with one another, with only the result from Ref. [15] lying slightly outside of one standard deviation from the overall average, which is 422.62(5) ms. The normalized χ 2 for the average is a satisfactory 1.0.…”

Section: B Time-decay Analysissupporting

confidence: 76%

“…There have also been three previous measurements claiming sub 0.1% precision; they yielded half-life values of 422.47(39) ms [14], 422.28(23) ms [15], and 422.57(13) ms [10], all less precise than ours. The first two of these measurements depended on plastic scintillators to detect β particles from the decay, while the third used a very similar technique to ours, with a proportional gas counter used for β detection.…”

Section: B Time-decay Analysismentioning

confidence: 73%

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Precise half-life measurement of the superallowedβ+emitter46V

et al. 2012

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The half-life of 46 V has been measured to be 422.66(6) ms, which is a factor of two more precise than the best previous measurement. Our result is also consistent with the previous measurements, with no repeat of the disagreement recently encountered with QEC values measured for the same transition. The Ft value for the 46 V superallowed transition, incorporating all world data, is determined to be 3074.1(26) s, a result consistent with the average Ft value of 3072.08(79) s established from the 13 best-known superallowed transitions.

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Section: B Time-decay Analysissupporting

confidence: 76%

Section: B Time-decay Analysismentioning

confidence: 73%

Precise half-life measurement of the superallowedβ+emitter46V

et al. 2012

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“…There are two cases, 26 Al m and 38 K m , in which the superallowed decay originates from an isomeric state. For both, there are Q EC -value measurements that correspond to the ground state as well as to the isomer.…”

Section: B Data Tablesmentioning

confidence: 99%

“…The decays of 18 F, 26 Si, 30 S, 34 Ar and 42 Ti required special treatment in our presentation. In each of these five cases, the absolute branching ratio for a single β-transition has been measured.…”

Section: B Data Tablesmentioning

confidence: 99%

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Superallowed0+→0+nuclearβdecays: A critical survey with tests of the conserved vector current hypothesis and the

2005

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A complete and critical survey is presented of all half-life, decay-energy and branching-ratio measurements related to 20 superallowed 0 + → 0 + decays; no measurements are ignored, though some are rejected for cause and others updated. A new calculation of the statistical rate function f is described and experimental f t values determined. The associated theoretical corrections needed to convert these results into Ft values are discussed, and careful attention is paid to the origin and magnitude of their uncertainties. As an exacting confirmation of the conserved vector current hypothesis, the Ft values are seen to be constant to 3 parts in 10 4 . These data are also used to set a new limit on any possible scalar interaction: C S /C V = −(0.00005 ± 0.00130). The average Ft value obtained from the survey, when combined with the muon liftime, yields the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa matrix, V ud = 0.9738 ± 0.0004; and the unitarity test on the top row of the matrix becomes |V ud | 2 + |V us | 2 + |V ub | 2 = 0.9966 ± 0.0014 using the Particle Data Group's currently recommended values for V us and V ub . We also express this result in terms of the possible existence of right-hand currents. Finally, we discuss the priorities for future theoretical and experimental work with the goal of making the CKM unitarity test more definitive.

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Induced scalar interaction in the analysis of superallowed fermi ? transitions

Szybisz

1978

Z Physik A

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Nuclear Structure superallowed Fermi/3 transitions; derivation of the coupling constant for the induced scalar interaction fs from experimental data.Very recent works reported a significant improvement in the consistency of Yt values for superallowed Fermi/3-decays. This fact led us to investigate some aspects which are not usually tackled in a study of this kind of transition. In a recent paper we suggested that an upper limit for the coupling constant fs for the induced scalar interaction can be derived analyzing superallowed Fermi /3-transitions. In the present work we revise and improve the method for the determination of fs. The result obtained, fs/fv = (-0.4 __ 1.4)x 10-3, agrees with the prediction of the CVC theory.

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A measurement of the half-life of the superallowed Fermi decay and a study of some systematic errors involved

Cited by 20 publications

References 11 publications

Precise half-life measurement of the superallowedβ+emitter46V

Precise half-life measurement of the superallowedβ+emitter46V

Superallowed0+→0+nuclearβdecays: A critical survey with tests of the conserved vector current hypothesis and the

Induced scalar interaction in the analysis of superallowed fermi ? transitions

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