CUPID: CUORE (Cryogenic Underground Observatory for Rare Events) Upgrade with Particle IDentification

TL;DR

CUPID is a proposed next-generation bolometric experiment building on CUORE's infrastructure, aiming to detect neutrinoless double beta decay by increasing source mass and reducing backgrounds through advanced detector technologies and material purification.

Contribution

This paper outlines the science goals, design scope, and R&D roadmap for CUPID, a major upgrade over CUORE with enhanced background suppression and detector capabilities.

Findings

CUPID aims to probe Majorana neutrinos in the inverted hierarchy region.

It plans to increase source mass and reduce backgrounds significantly.

The experiment will incorporate new detector technologies and material purification methods.

Abstract

CUPID is a proposed future ton-scale bolometric neutrinoless double beta decay ($0\nu\beta\beta$) experiment to probe the Majorana nature of neutrinos and discover Lepton Number Violation in the so-called inverted hierarchy region of the neutrino mass. CUPID will be built on experience, expertise and lessons learned in CUORE, and will exploit the current CUORE infrastructure as much as possible. In order to achieve its ambitious science goals, CUPID aims to increase the source mass and dramatically reduce the backgrounds in the region of interest. This requires isotopic enrichment, upgraded purification and crystallization procedures, new detector technologies, a stricter material selection, and possibly new shielding concepts with respect to the state of the art deployed in CUORE. This document reviews the science goals of CUPID, defines the scope for the near-term R&D activities, and presents a roadmap towards mounting this next-generation experiment. A separate document discusses the extensive R&D program in more detail.