Is the neutron its own antiparticle?

Question

I have seen multiple claims that the neutron is its own antiparticle. However surely the antiparticle of the neutron would have a baryon number of -1 because it would consist of three antiquarks, each of which would have a baryon number of -⅓. I could be mistaken but I'm assuming that baryon number is flipped when taking antiparticles.

Answer 1

Yes, the antineutron has baryon number -1, because it is composed of antiquarks. The neutron itself is composed of quarks and has a baryon number of +1. It is made up of 1 up quark and 2 down quarks and the antineutron is made up of 1 anti-up quarks and 2 anti-down quarks.

Hence, the neutron is NOT its own anti-particle.

For more information on the anti-neutron, start with its wikipedia page