Preliminary results of the R2D2 project

Abstract

The search for neutrinoless double beta decay (0ν ββ) could cast light on one critical piece missing in our knowledge i.e. the nature of the neutrino mass. Its observation is indeed the most sensitive experimental way to prove that neutrino is a Majorana particle. The observation of such a potentially rare process demands a detector with an excellent energy resolution, an extremely low radioactivity and a large mass of emitter isotope. Nowadays many techniques are pursued but none of them meets all the requirements at the same time. The goal of R2D2 is to prove that a spherical high pressure gas TPC filled with xenon could meet all the requirements and provide an ideal detector for the 0ν ββ decay search. The first prototype has demonstrated an excellent resolution with argon meeting the expectations and independently on the particle track's length. In the presented talk the first R2D2 results are discussed as well as the project roadmap and future developments.