Source: wikibot/antineutron
= Antineutron
{wiki=Antineutron}
An antineutron is the antimatter counterpart of a neutron. Just like a neutron, which is a neutral baryon consisting of three quarks (two down quarks and one up quark), an antineutron is made up of three antiquarks: two anti-down quarks and one anti-up quark. Antineutrons have the same mass as neutrons but carry opposite quantum numbers.