Measurements of the beta-neutrino correlation coefficient (aβν) in nuclear beta decay, together w... more Measurements of the beta-neutrino correlation coefficient (aβν) in nuclear beta decay, together with the Fierz interference term (bF ), provide a robust test for the existence of exotic interactions beyond the Standard Model of Particle Physics. The extraction of these quantities from the recoil ion spectra in β-decay requires accurate knowledge, decay branching ratios, and high-precision calculations of higher order nuclear effects. Here, we report on a new measurement of the Ne β-decay branching ratio, which allows a reanalysis of existing high-precision measurements. Together with new theoretical calculations of nuclear structure effects, augmented with robust theoretical uncertainty, this measurement improves on the current knowledge of aβν in Ne by an order of magnitude, and strongly constrains the Fierz 1 ar X iv :2 10 7. 14 35 5v 1 [ nu cl -e x] 2 9 Ju l 2 02 1 term in beta decays, making this one of the first extractions to constrain both terms simultaneously. Together, thes...
Measurements of the beta-neutrino correlation coefficient (aβν) in nuclear beta decay, together w... more Measurements of the beta-neutrino correlation coefficient (aβν) in nuclear beta decay, together with the Fierz interference term (bF ), provide a robust test for the existence of exotic interactions beyond the Standard Model of Particle Physics. The extraction of these quantities from the recoil ion spectra in β-decay requires accurate knowledge, decay branching ratios, and high-precision calculations of higher order nuclear effects. Here, we report on a new measurement of the Ne β-decay branching ratio, which allows a reanalysis of existing high-precision measurements. Together with new theoretical calculations of nuclear structure effects, augmented with robust theoretical uncertainty, this measurement improves on the current knowledge of aβν in Ne by an order of magnitude, and strongly constrains the Fierz 1 ar X iv :2 10 7. 14 35 5v 1 [ nu cl -e x] 2 9 Ju l 2 02 1 term in beta decays, making this one of the first extractions to constrain both terms simultaneously. Together, thes...
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Papers by Jason Harke