# XENONnT- and the Neutron Veto design.

Agostini F.

Comunicazione
III - Astrofisica
Aula GSSI Rettorato - Auditorium - Mercoledì 25 h 16:30 - 19:00
XENONnT, a multi-ton dark-matter direct search experiment located at Laboratori Nazionali del Gran Sasso, is the upgrade of XENON1T, which successfully brought to end the data taking in 2018. XENONnT is now near the end of the upgrade phase. The upgrade consists mainly in having a larger Time Projection Chamber, a new cryogenic xenon gas recovery and storage system, a faster liquid-xenon purification system, an online removal from ${}^{222}Rn$ emanated inside the detector and a new detector, the Neutron Veto (NV), to tag the residual neutron background. The NV will be realized by doping the water surrounding the cryostat with Gd, and adding 120 high-QE PMTs to detect the Cerenkov light emitted after neutron capture on Gd and H.