Beta asymmetry of the first forbidden 1/2+→1/2−transition inNe19and its relationship to the parity nonconserving nucleon-nucleon interaction
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Abstract
We report a measurement of the \ensuremath{\beta} asymmetry of the first-forbidden transition from the 1/${2}^{+}$ ground state of $^{19}\mathrm{Ne}$ to the 1/${2}^{\mathrm{\ensuremath{-}}}$ level at 110 keV in $^{19}\mathrm{F}$. Using atomic beam methods to prepare a 100% polarized source of $^{19}\mathrm{Ne}$, we identify the 1/${2}^{+}$\ensuremath{\rightarrow}1/${2}^{\mathrm{\ensuremath{-}}}$ decays by the detection of the subsequent 110 keV gamma emitted in coincidence with a beta. The average \ensuremath{\beta} asymmetry of the first-forbidden transition is measured to be 〈A〉=17\ifmmode\pm\else\textpm\fi{}12 %. We simultaneously make an improved measurement of the branching ratio of the same transition and find \ensuremath{\Gamma}=(1.13\ifmmode\pm\else\textpm\fi{}0.09)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$ in good agreement with previous results. Our measurement is used to obtain an improved calibration of the isovector parity-mixing matrix element between the 1/${2}^{+}$ ground state of $^{19}\mathrm{F}$ and the 1/${2}^{\mathrm{\ensuremath{-}}}$ level at 110 keV.
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