\begin{document}$ ^{82} $\end{document}Se and \begin{document}$ ^{100} $\end{document}Mo. For the closed shell nucleus \begin{document}$ ^{136} $\end{document}Xe, QRPA can also reproduce the spectra with proper treatments. Considering the high-lying state reduction, we also find that the nuclear shell model can also adequately reproduce the spectra and Gamow-Teller transition strength under a unique quenched axial-vector coupling constant \begin{document}$ g_A $\end{document}. For \begin{document}$ ^{136} $\end{document}Xe, we find that flipping the sign for the decay strength causes the spectra to go beyond the so-called high-lying state dominance hypothesis. These results call for future high precision measurements of charge-exchange reactions."> What can we learn from recent 2<i>ν</i><i>β</i><i>β</i> experiments? -
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