A modular NaI(Tl) detector for intermediate energy photons

Experimental verification of Coulomb de-excitation in pionic hydrogen

“…For the measurements in liquid hydrogen, we used PILOT-U scintillators with a thickness of 5 mm, whereas for the measurements in gas, NE102A scintillators with a thickness of 15 mm were used in order to partially compensate for the lower pion stop density. The neutrons from the CEX reaction in the target were accepted only if coincident with a suitably delayed π-stop signal and a corresponding γ-ray signal from a π 0 -decay in the NaI calorimeter [15].…”