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High precision measurements of isospin $T=1/2$ decays in the neutron andnuclei provide strong model-independent constraints on extensions to thestandard model of particle physics. A measurement of the $\beta$-asymmetry in$^{19}$Ne decay between the initial nuclear spin and the direction of theemitted positron is presented which establishes this decay as the mostprecisely characterized nuclear mirror and fixes the Fermi-to-Gamow-Tellermixing ratio to $\rho = 1.6014(+21/-28)_{sys}(8)_{stat}$. This is consistentwith the previous, most precise measurement, produces a value of the CKMunitarity parameter $V_{ud}$ in agreement with the nuclear mirror, neutron andsuperallowed $\beta$-decay data sets, shows no evidence for second classcurrents, and can be effectively used with neutron decay data to place a limitson exotic tensor couplings.

A look into mirrors: A measurement of the $\beta$-asymmetry in $^{19}$Ne decay and searches for new physics