# Test of the PMTs for the XENONnT Neutron Veto.

Mancuso A.

Comunicazione
III - Astrofisica
Aula GSSI Rettorato - Auditorium - Mercoledì 25 h 16:30 - 19:00
XENONnT is a multi-ton detector for direct search of dark matter. It consists of a liquid/gas xenon TPC, surrounded by 700 t of Gd-doped water for muon and neutron tagging. The Neutron Veto of the XENONnT experiment will be equipped with 120 additional high-QE low-radioactivity photomultiplier tubes ($8^{\prime\prime}$ Hamamatsu R5912), in order to guarantee a high light collection efficiency in the region around the cryostat. In this communication, we describe the set-up built at LNGS to characterize the PMTs, and the results of the test in terms of gain, single pe resolution, dark rate, after-pulse.