Proton, antiproton annihilation

[Morrow93]

Need help with this question.

What are the wavelengths of the two photons produced when a proton and antiproton at rest annihilate?

Any help is appreciated, thank you :)

 

[ofirg]

Hi,

Use energy conservation and the de broglie relation between energy and wavelength.

 

[PAllen]

Also note that even for slow proton/antiproton, the energy available allows for many reaction products. Mixtures of pions and gammas are common. Even e+e- is a possible product. The only reason for the myth that annihilation produces photons is that for slow e+/e- there is almost no other available path (there actually is one exceedingly rare alternative even for slow electron positron: a neutrino - anti-neurtrino pair; doubt this has ever been verified experimentally).