Question: The positronium is an atomic system made by an e - and an e + bound by the electromagnetic force. (1) Determine the relationship that

The positronium is an atomic system made by an e- and an e+ bound by the electromagnetic force.

(1) Determine the relationship that this condition imposes between the orbital momentum l, the total spin s and the charge conjugation C.

(2) Determine the relationship between l, s and n which allows the reaction e- e+ → nγ to occur without violating C.

(3) What is the minimum number of photons in which the ortho-positronium (3S1) and the para-positronium (1S0) can annihilate, respectively?

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