NEXT, a HPGXe TPC for neutrinoless double beta decay searches

TL;DR

This paper proposes a high-pressure gaseous xenon TPC with separated functions for calorimetry and tracking, aiming to improve neutrinoless double-beta decay detection through superior energy resolution and topological background rejection.

Contribution

It introduces a novel detector design combining calorimetry and tracking in a high-pressure xenon TPC for enhanced neutrinoless double-beta decay searches.

Findings

Potential for improved background rejection

Excellent energy resolution expected

Design aims for 100 kg Xe(136) detector

Abstract

We propose a novel detection concept for neutrinoless double-beta decay searches. This concept is based on a Time Projection Chamber (TPC) filled with high-pressure gaseous xenon, and with separated-function capabilities for calorimetry and tracking. Thanks to its excellent energy resolution, together with its powerful background rejection provided by the distinct double-beta decay topological signature, the design discussed in this Letter Of Intent promises to be competitive and possibly out-perform existing proposals for next-generation neutrinoless double-beta decay experiments. We discuss the detection principles, design specifications, physics potential and R&D plans to construct a detector with 100 kg fiducial mass in the double-beta decay emitting isotope Xe(136), to be installed in the Canfranc Underground Laboratory.