The ft value of the superallowed fermi beta decay 26mAl(β+)26Mg

Freeman, J.M.; Jenkin, J.G.; Murray, G.; Robinson, D.C.; Burcham, W.E.

doi:10.1016/0375-9474(69)90721-0

Cited by 47 publications

(8 citation statements)

References 23 publications

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“…Consequently, a number of mostly pre-1970 measurements have been rejected because they were not analyzed with the "maximum-likelihood" method. The importance of using this technique for precision measurements was not recognized until that time [64] and, without access to the primary data, there is no way a new analysis can be applied retroactively. All rejected half-life • Pr67 ( 18 Ne)…”

Section: B Data Tablesmentioning

confidence: 99%

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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Section: B Data Tablesmentioning

confidence: 99%

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

2005

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“…Al has an interesting level structure, in that it has a long lived (t 1/2 = 6.34 s) state only 228 keV above its ground state [1]. The β-decay of the ground state of 26 Al populates an excitation state in 26 Mg* which then emits a characteristic γ ray with an energy of 1.809 MeV.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement ofβ-delayed proton andγdecay ofP27

McCleskey¹,

Banu²,

McCleskey³

et al. 2016

Phys. Rev. C

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This is the first study of 27 P that measured both the β-delayed proton and β-delayed γ decays. While no new proton groups in the astrophysically interesting energy region of 300 -400 keV were observed, a new upper limit on the proton branching of 0.16% was estimated. Several new γ-ray lines were observed, mainly coming from the isobaric analog state (IAS) in 27 Si, which has been assigned a more accurate energy value of 6638(1) keV.

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“…Arguably the most studied γ-ray signature is the 1.809-MeV line from the β decay (t 1/2 = 7.2 × 10 5 y) of the J π = 5 + ground state of 26 Al ( 26g Al), a direct indication of the ongoing formation of 26 Al within our Galaxy. This signature is insensitive to 26 Al synthesized in its 0 + metastable state at 228 keV ( 26m Al), which β decays to the 26 Mg ground state (t 1/2 = 6.34 s [1]). Following inferences of 26 Al from meteoritic isotopic ratios [2] and the subsequent landmark astronomical detection of the 26g Al γ-ray signature [3], 26g Al has been the focus of increasingly sensitive measurements, aided by and driving the development of satellite-based γ-ray telescopes [4,5].…”

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confidence: 99%