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arXiv · 1906.01538

$Q_{\textrm{EC}}$-value determination for $^{21}$Na$\rightarrow^{21}$Ne and $^{23}$Mg$\rightarrow^{23}$Na mirror-nuclei decays using high-precision mass spectrometry with ISOLTRAP at ISOLDE/CERN

Jonas Karthein·Dinko Atanasov·Klaus Blaum·Martin Breitenfeldt·Vira Bondar·Sebastian George·Leendert Hayen·David Lunney·Vladimir Manea·Maxime Mougeot·Dennis Neidherr·Lutz Schweikhard·Nathal Severijns·Andree Welker·Frank Wienholtz·Robert Wolf·Kai Zuber
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Abstract

We report on high-precision $Q_{\textrm{EC}}$ values of the $^{21}$Na$\rightarrow^{21}$Ne and $^{23}$Mg$\rightarrow^{23}$Na mirror $\beta$-transitions from mass measurements with ISOLTRAP at ISOLDE/CERN. A precision of $\delta m/m = 9 \cdot 10^{-10}$ and $\delta m/m = 1.5 \cdot 10^{-9}$ was reached for the masses of $^{21}$Na and $^{23}$Mg, respectively. We reduce the uncertainty of the $Q_{\textrm{EC}}$ values by a factor five, making them the most precise experimental input data for the calculation of the corrected $\mathcal{F} t$-value of these mixed Fermi/Gamow-Teller transitions. For the $^{21}$Na$\rightarrow^{21}$Ne $Q_{\textrm{EC}}$ value, a $2.3 \sigma$ deviation from the literature $Q_{\textrm{EC}}$-value was found.

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Jonas Karthein, Dinko Atanasov, Klaus Blaum, Martin Breitenfeldt, Vira Bondar, Sebastian George, Leendert Hayen, David Lunney, Vladimir Manea, Maxime Mougeot, Dennis Neidherr, Lutz Schweikhard, Nathal Severijns, Andree Welker, Frank Wienholtz, Robert Wolf, Kai Zuber. 2019-06-04. $Q_{\textrm{EC}}$-value determination for $^{21}$Na$\rightarrow^{21}$Ne and $^{23}$Mg$\rightarrow^{23}$Na mirror-nuclei decays using high-precision mass spectrometry with ISOLTRAP at ISOLDE/CERN. https://doi.org/10.1103/physrevc.101.049901

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