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We discuss the unique baryon number violation by two units neutron decay mode$n\to \bar p e^+\chi$, with $\chi$ being the standard model (SM) neutrino $\nu$or antineutrino $\bar\nu$ or any beyond SM light fermion, in the framework ofeffective field theory. This mode is kinematically allowed but rarely discussedtheoretically or searched for experimentally. We estimate the lower bound onits partial lifetime from that of the dinucleon decay $np\to e^+\chi$ peroxygen nucleus $^{16}$O set by the Super-Kamiokande experiment, with aconservative bound $\Gamma^{-1}_{n\to\bar pe^+\chi}>5.7\times 10^{39}~\rm yrs$.We also discuss its characteristic signature for the future experimental searchand astrophysical implications.

$\Delta B=2$ neutron decay into antiproton mode $n\to \bar pe^+\nu(\bar\nu)$