Undergrad Antiproton and positron annihilation

[Sasho Andonov]

To make antihydrogen (an antiproton bound to a positron) requires supplies of positrons and antiprotons that are moving very slowly (enough to combine into atoms). I am wondering does someone have knowledge how much energy is released if antiproton annihilate itself with positron? What would be the outcome of this annihilation?

 

[JimWhoKnew]

I am wondering does someone have knowledge how much energy is released if antiproton annihilate itself with positron? What would be the outcome of this annihilation?

An antiproton can't annihilate itself with a positron. They are not each other's antiparticle. An antiproton can "capture" a positron to form a neutral antihydrogen anti-atom. The energy released is exactly the same as for a proton "capturing" an electron: the ionization energy (absolute value) plus the free electron's excess (depends on the coordinate frame of reference).

In most cases, particle-antiparticle annihilation results in EM radiation (photons). The total energy of the photons is twice the energy associated with a single particle's rest mass ($~E_0=2mc^2~$) plus the excess due to the "kinetic" corrections.

 

[PeroK]

I am wondering does someone have knowledge how much energy is released if antiproton annihilate itself with positron?

Generally annhiliation is between a particle and its antiparticle. The interaction between an antiproton and a positron would be equivalent to the interaction between a proton and an electron.