BrilLanCe detector energy resolution characterization at HI$\vec{\gamma}$S*

The High Intensity $\gamma$-ray source (HI$\vec{\gamma}$S) produced a variable $\gamma$-ray beam in the energy range of 2.5 to 15.5 MeV with an energy resolution of 50-100 keV. The $\gamma$-ray spectra from several BrilLanCe detectors (manufactured by Saint-Gobain Cermanics and Plastics, Inc.) were collected over this range of energy. The beam energy resolution was monitored throughout the experiment using a High Purity Germanium (HPGe) detector, running in parallel. The energy resolution of the $\gamma$-ray beam was obtained using a Gaussian fit to deconvoluted HPGe data. Gaussian fits to the BrilLanCe detector spectra were then corrected for the beam energy spread to obtain the detector resolution. A 4$^{''}$(diameter)x 6$^{''}$(long) LaCl$_{3}$Ce detector, a 3$^{''}$x 3$^{''}$ LaBr$_{3}$Ce detector and a 2$^{''}$x 2$^{''}$ LaBr$_{3}$Ce detector are characterized in the present study. The energy resolution of each detector will be reported as a function of incident $\gamma$-ray energy from 2.5 to 15.5 MeV, and the response functions will be compared to spectra obtained with HPGe and NaI detectors.