Ps-TOF (positronium time-of-flight) measurement stat



This station is for the measurement of the energy of positronium emitted from a solid surface. The incident positrons hit the sample target and the ortho-Ps atoms emitted from the surface annihilate in flight. The annihilation γ-rays are viewed by detector through lead slits and the time of the detection with reference to the positron injection time is recorded. The width and the frequency of the incident positron pulse are 1ns-10ns (variable) and 50 Hz, respectively.