The neutron decays into a proton, electron, and an electron antineutrino. Into what does the antineutron decay?
A) a proton, positron, and electron antineutrino
B) an antiproton, positron, and electron neutrino
C) a proton, electron, and electron antineutrino
D) an antiproton, electron, and electron neutrino
E) an antiproton, electron, and electron antineutrino

Question

Quizplus · Accepted Answer

The antineutron is composed of antiquarks (two anti-up and one anti-down) and therefore will decay into antiproton, positron, and electron neutrino. This is similar to the decay of a neutron, but with the replacement of particles with their antiparticles. Therefore, the correct choice is B.

The Neutron Decays into a Proton, Electron, and an Electron