The fractional difference in the masses of the neutron and antineutron is . Its antiparticle, the antihypertriton, is formed of an antiproton, an antineutron and any antihyperon. The magnetic moment of the antineutron is the opposite of that of the neutron. The antineutron is the antiparticle of the neutron with symbol . Since the antineutron is electrically neutral, it cannot easily be observed directly. In 1970, he proposed neutron/antineutron oscillations as a possibility for observing violation of baryon number. This is because the antineutron is composed of antiquarks, while neutrons are composed of quarks. The antineutron consists of one up antiquark and two down antiquarks. The antineutron was discovered soon thereafter by Oreste Piccioni and co-workers, also at the Bevatron.