  The G-NUMEN array is the future gamma spectrometer of the NUMEN experiment
(Nuclear Matrix Element for the Neutrinoless double beta decay), to be
installed around the object point of the MAGNEX magnetic spectrometer at the
INFN-LNS laboratory. This project aims at exploring Double Charge Exchange
(DCE) reactions in order to obtain crucial information about the neutrinoless
double beta decay ($0\nu\beta\beta$). The primary objective of the G-NUMEN
array is to detect the gamma rays emitted from the deexcitation of the excited
states populated via DCE reactions with good energy resolution and detection
efficiency, amidst a background composed of transitions from competing reaction
channels with far higher cross sections. To achieve this, the G-NUMEN signals
will be processed in coincidence with those generated by the detection of the
reaction ejectiles in the MAGNEX Focal Plane Detector(FPD). Under the expected
experimental conditions, G-NUMEN detectors will operate at high counting rates,
of the order of hundreds of kHz per detector, while maintaining excellent
energy and timing resolutions. The complete array will consist of over 100
LaBr$_3$(Ce) scintillators. Initial tests have been conducted on the first
detectors of the array, allowing for the determination of their performance at
high rates.
