\begin{document}$ U(1)_{B-L} $\end{document} gauge theory. If the gauge coupling constant is extremely small, the féeton becomes a candidate for dark matter. We show that its decay to a pair of an electron and a positron explains the observed Galactic 511-keV gamma-ray excess in a consistent manner. This féeton dark matter decays mainly into pairs neutrino and anti-neutrino. Future low-energy experiments with improved directional capability will enable capturing these neutrino signals. The seesaw-motivated parameter space predicts a relatively short féeton lifetime that is comparable to the current cosmological constraint."> Féeton (<i>B</i>-<i>L</i> gauge boson) dark matter for the 511-keV gamma-ray excess and the prediction of low-energy neutrino flux -
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