Development of gamma ray detectors for the parity violation NDTGamma experiment.*

For the NDTGamma Experiment, the goal is to measure the directional asymmetry in the gamma-ray emission from the reaction n+D->T+gamma (6.2 MeV).  The gamma ray direction emission will be measured using an array of 100 CsI scintillators attached to photomultiplier tubes (PMTs). To test the individual PMTs to be used in the NDTGamma experiment a dark box was used with a Co-60 gamma-ray source.  The current output from the PMTs was examined both for the dark current without a gamma-ray source as the high voltage was increased, and with the Co-60 source to ensure that the PMTs were functioning. Additionally, the outcome impulses of the cathode and anode currents were examined. The decrease of the noise in the PMT output was investigated. Designs were investigated for mounting the PMTs to the scintillators. The scintillators processes, PMTs functioning, testing methodology, and results will be presented.