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Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi><mml:mo>−</mml:mo><mml:mover accent="true"><mml:mi>n</mml:mi><mml:mo accent="true" stretchy="false">¯</mml:mo></mml:mover></mml:math>oscillation in Super-Kamiokande
A search for neutron-antineutron ($n\ensuremath{-}\overline{n}$) oscillation was undertaken in Super-Kamiokande using the 1489 live-day or $2.45\ifmmode\times\else\texttimes\fi{}{10}^{34}$ neutron-year exposure data. This process violates both baryon and baryon minus lepton numbers by an absolute value of two units and is predicted by a large class of hypothetical models where the seesaw mechanism …