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## Homework Statement

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, E

_{k}(>0), is given).

The energy of the two resulting photons is to be determined.

## Homework Equations

Conservation of energy.

## The Attempt at a Solution

So I wrote the conservation of energy as follows:

2m

_{0}c

^{2}+ T = 2ε + E

_{k}( 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 E

_{k}).

However, the proposers of the problem consider the conservation of energy as follows:

2m

_{0}c

^{2}+ T + E

_{k}= 2ε;

So who is right?