A proton p collides with a neutron(at rest) n at relatively low-energies and creates a 'deuterium-core' d:
Find the wavelength for the photon as a function of the proton's momentum and the angle that the photon creates with the proton.Do this relativistic.
So seems I'm supposed to set up two equations: energy- and momentum-balance. I tried to set up the relativistic energy equation as function of momentum, but became messy to solve. Any hint on what this energy equation could look like?