A spectrometer for 1 GeV electrons using scintillation detectors

Quasi-elastic and inelastic inclusive electron scattering from an oxygen jet target

“…Due to this exponential decrease an on-line monitor of the luminosity was necessary and a detection of Møller electrons was used to this purpose, as described later on. The scattered electrons were measured at 32 0 , 37.1 0 , 83 0 at different energies from 0.5 to 1.5 GeV with a scintillation detector composed by a front part which allowed mass separation and angular definition and by a rear part consisting of BGO crystals to measure the energy of the scattered electrons and to improve their separation from proton and pion background [12]. Despite the common use of magnetic spectrometers in electron scattering experiments, our calorimeter provided a valid alternative for this apparatus since an energy resolution of few percent was required, still sufficient to separate the broad structures of QE and ∆(1232) peaks.…”

“…The suppression factors as deduced from our analysis for 16 O (full squares) and12 C (open circles) as a function of Q 2 at fixed invariant mass W . The result of the analysis[37] at the photon point is also reported (open triangles).…”