The first results of the XENONnT Dark Matter experiment, installed underground at the INFN Laboratori Nazionali del Gran Sasso, has been presented on July 22 at the IDM2022 conference in Vienna.

XENONnT presents the lowest background ever achieved in a direct dark matter experiment, 5 times lower than its predecessor XENON1T.

We observe no excess above known backgrounds, so we can attribute the excess observed two years ago in the XENON1T experiment as due to trace amount of tritium, which was one of the hypothesis at the time. We can now set stringent new limits on solar axions, an enhanced neutrino magnetic moment, and axion-like particles as bosonic dark matter.

The XENON-Bologna group is responsible of the MonteCarlo simulations and background predictions oft the experiment (crucial in the current analysis), and of the design, installation and operation of the neutron veto, one of the novel subsystems of XENONnT, already used also in this work thanks to its very good performances in removing part of the gamma background from detector materials.

The XENON-Bologna group is led by Gabriella Sartorelli, and composed by Marco Selvi, Lorenzo Bellagamba, Franco Semeria, Graziano Bruni, Pietro Di Gangi, Federica Agostini, Andrea Mancuso e Federico Casadei.

Other colleagues and INFN Services have been instrumental for the detector construction: Antonio Chiarini, Marco Guerzoni, Roberto Michinelli, the Mechanical Workshop, together with the Direction&Administration.