Branching ratios for the beta decay of 21Na

Abstract

We have measured the beta-decay branching ratio for the transition from 21Na to the first excited state of 21Ne. A recently published test of the standard model, which was based on a measurement of the beta-nu correlation in the decay of 21Na, depended on this branching ratio. However, until now only relatively imprecise (and, in some cases, contradictory) values existed for it. Our new result, 4.74(4)%, reduces but does not remove the reported discrepancy with the standard model.

arXiv commentRevtex4, 2 figs

References in corpus (2)

• Superallowed nuclear beta decays: A critical survey with tests of CVC and the standard model
• Calculated corrections to superallowed Fermi beta decay: New evaluation of the nuclear-structure-dependent terms

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• Measurement of the Beta-Neutrino Correlation of Sodium-21 using Shakeoff Electrons
• Standard Model tests with trapped radioactive atoms
• The use of Geant4 for simulations of a plastic beta-detector and its application to efficiency calibration
• The beta-gamma decay of 21Na
• Precise branching ratio measurements in ${}^{19}$Ne beta decay and fundamental tests of the weak interaction