A given pozitron with T kinetic energy is approaching an electron bound to a hard nucleus(in the K energy level, and the ionization energy for this level, Ek(>0), is given).
The energy of the two resulting photons is to be determined.
Conservation of energy.
The Attempt at a Solution
So I wrote the conservation of energy as follows:
2m0c2 + T = 2ε + Ek ( ε is the energy of one photon )
Let me explain my way of thinking: After the anihilation, the electron has vanished, so the atom has become a ion(so it's energy has increased by Ek).
However, the proposers of the problem consider the conservation of energy as follows:
2m0c2 + T + Ek = 2ε;
So who is right?