Abstract

The Backward Angle Neutron Detector (BAND) of CLAS12 detects neutrons emitted at backward angles of 155 degrees to 175 degrees, with momenta between 200 and 600 MeV/c(0). It is positioned 3-m upstream of the target, consists of 18 rows and 5 layers of 7.2-cm by 7.2-cm scintillator bars, and read out on both ends by PMTs to measure time and energy deposition in the scintillator layers. Between the target and BAND there is a 2-cm thick lead wall followed by a 2-cm veto layer to suppress gammas and reject charged particles.