The XENONnT detector will be replacing the XENON1T detector currently taking data at the Laboratori Nazionali del Gran Sasso (LNGS) underground laboratory in Italy in 2019. The picture shows the current XENON1T installations in Hall B underground at LNGS. The XENON collaboration pioneered the two phase liquid xenon detector technology and consistently pushed its envelope, providing the best Weakly Interacting Massive Particle (WIMP) dark matter limits with successively larger detectors.

Kavli IPMU is leading the Japanese participation in the XENON1T detector's impending upgrade to XENONnT, the final step in the XENON program. XENONnT is designed to detect possible WIMP Dark Matter interactions with the xenon nuclei in the target mass down to cross sections of a few times 10-48 cm2 for a 50 GeV/c2 WIMP. With XMASS colleagues from ICRR at the University of Tokyo, Nagoya University, and Kobe University we bring XMASS expertise in particular in xenon purification and radon monitoring and mitigation from Kamioka to LNGS. In the collaboration's effort to design the best neutron veto surrounding the XENONnT liquid xenon time projection chamber we also use our shared Super-Kamiokande expertise with gadolinium and explore the design and implementation of a gadolinium sulfate loaded water Cherenkov option for that neutron veto. At the level of sensitivity aimed for by XENONnT it becomes imperative to veto neutron associated events where neutrons produced in the ubiquitous (alpha/neutron) reactions in the detector material escape from the liquid xenon time projection chamber. And of course all of us are looking forward to extract the best science from the best XENONnT detector that the collaboration's combined knowledge and experience can build. Pushing boundaries across the range from detector technology and cleanliness to the final physics output is our focus, here at Kavli IPMU and all collaborating institutions.

(Last update: 2018/05/25)