How can a particle itself be it's antiparticle?

Answer 1

Answer:I suppose that means that all relevant properties are neutral, so when they are inverted, nothing changes. For example: the proton has a positive electrical charge, but the antiproton has a negative charge. The neutron has no electric charge, so the antineutron has no charge either - but there are still a few other properties where the antineutron is the opposite of the neutron. A photon doesn't have these properties (in other words, it has them equal to zero), so it is its own antiparticle. Answer:There is a relativistic wave equation called the Majorana equation, that predicts that neutrinos and antineutrinos are, in fact, the same thing. Some experimentation is being done to find out whether this is true. There is a link to a Wikipedia article below.

Answer 2

A particle can be its own antiparticle if it is a neutral particle with equal properties as its antiparticle, such as the photon. This means that when a particle collides with its antiparticle, there is no net change in charge or other quantum numbers.