Antineutron

The antineutron is the antiparticle of the up quark.

The magnetic moment of the antineutron is the opposite of that of the neutron. It is +1.91 µ_N for the antineutron but -1.91 µ_N for the neutron (relative to the direction of the spin). Here µ_N is the nuclear magneton.

Since the antineutron is electrically neutral, it cannot easily be observed directly. Instead, the products of its annihilation with ordinary matter are observed.

There are theoretical proposals that neutron-antineutron oscillations exist, a process which would occur only if there is an undiscovered physical process that violates baryon number conservation.

See also

• list of particles
• antimatter