Can an antiproton(negatron) orbit around a regular nucleus?

[AndromedaRXJ]

Can an antiproton(negatron) "orbit" around a regular nucleus?

Since it's negatively charged like an electron, can it orbit around a "normal" nucleus? Or a more general question: can something be part matter and part anti-matter?



Edit: I guess this answers my question.

http://en.wikipedia.org/wiki/Antiprotonic_helium

Is there anymore examples like that?

 

[Mattenerinfo]

This wouldn't work because electrons do not orbit a proton due to the fact that they are negative, that's just the factor that keeps them there. They orbit because they have a higher energy due to equal but opposite charge yet much smaller size. An anti-proton and proton would simply impact and annihilate. And that antiprotonic helium is in no way stable, lasting mere microseconds.

 

[haael]

Antiproton is too heavy to orbit a proton like electron. So it would not form an exotic "atom". It could however form an exotic "nucleus" of proton and antiproton. It would be extremely unstable, perhaps lasting only few Planck intervals, but possible.

The classification of particles as "matter" and "antimatter" is just a convention. It is possible for "matter" and "antimatter" particles to exist in one bigger particle.

 

[cmb]

You can have particles orbit with their anti-particles, they are called 'onium', e.g. 'protonium' would be a proton and anti-proton bound together.