Precision measurement of the $\beta$-asymmetry in spin-polarized ${}^{37}\mathrm{K}$ decay

Abstract

Using TRIUMF's neutral atom trap, TRINAT, for nuclear $\beta$ decay, we have measured the $\beta$ asymmetry with respect to the initial nuclear spin in ${}^{37}\mathrm{K}$ to be $A_{\beta }=-0.5707(13{)}_{\mathrm{syst}}(13{)}_{\mathrm{stat}}(5{)}_{\mathrm{pol}}$, a 0.3% measurement. This is the best relative accuracy of any $\beta$-asymmetry measurement in a nucleus or the neutron, and is in agreement with the standard model prediction $-0.5706(7)$. We compare constraints on physics beyond the standard model with other $\beta$-decay measurements, and improve the value of $V_{\mathrm{ud}}$ measured in this mirror nucleus by a factor of 4.

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Cited by in corpus (19)

• New physics searches in nuclear and neutron $\beta$ decay
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• Standard Model $\mathcal{O}(\alpha )$ renormalization of $g_A$ and its impact on new physics searches
• Comprehensive analysis of beta decays within and beyond the Standard Model
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• All orders factorization and the Coulomb problem
• Beta Spectrum Generator: High precision allowed $\beta$ spectrum shapes
• Field Theory of the Fermi Function
• Constraints on subleading interactions in beta decay Lagrangian
• Influence of the recoil-order and radiative correction on the beta decay correlation coefficients in mirror decays
• A decay microscope for trapped neon isotopes
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• Precision calculation of isospin-symmetry-breaking corrections to T=1/2 mirror decays using multi-reference charge-dependent density functional theory
• ARIEL experiments and theory
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• Analog-antianalog isospin mixing in ${}^{47}$K ${\beta }^{-}$ decay
• Estimate of the location of the neutron drip line for calcium isotopes from an exact Hamiltonian with continuum pair correlations
• $A_{\beta }[E_{\beta }]$ in ${}^{37}$K decay: new physics with opposite $\beta$ helicity