Two photons from decay of pi0 produced in a neutron-proton collision

On this view the two photons appear in line, and pointing towards the beginning of a short proton track. This proton track was produced when a neutron from the decay of a collided with a proton .

For a full description of this rich but rather complicated event, click here. (Measurements are presented demonstrating that the effective mass of the two photons equals the mass of the )

< back