Description
Chair: Silvia Capelli
The NEXT collaboration is pursuing a phased program to search for neutrinoless double beta decay (0nubb) using high pressure xenon gas time projection chambers. The power of electroluminescent xenon gas TPCs for 0nubb derives from their excellent energy resolution (<1%FWHM), and the topological classification of two electron events, unique among scalable 0nubb technologies. Xenon gas...
Neutrinoless double-beta decay (0ν2β) is a hypothetical rare nuclear transition. Its observation would provide an important insight about the nature of neutrinos (Dirac or Majorana particle) demonstrating that the lepton number is not conserved. BINGO aims to set the technological and conceptual grounds for future bolometric 0ν2β experiments. It is based on a dual heat-light readout, i.e. a...
Neutrinoless double beta decay has been a key topic that could help scientists to understand the properties of the neutrino including whether the neutrino is its own antiparticle, lepton number violation and so on. The China Dark Matter Experiment (CDEX) aims at direct searches of light Weakly Interacting Massive Particles (WIMPs) and neutrinoless double beta decay experiment at the China...
CUPID is a next-generation tonne-scale bolometric neutrinoless double beta decay experiment to probe the Majorana nature of neutrinos and discover Lepton Number Violation if the effective neutrino mass is greater than 10 meV. CUPID will be built on experience, expertise and lessons learned in CUORE, and will be installed in the current CUORE infrastructure in the Gran Sasso underground...
A liquid scintillator containing a tetrakis (isopropyl acetoacetato) zirconium (Zr(iPrac)$_{4}$) has been developed for ZICOS experiment which will search for neutrinoless double beta decay (0$\nu\beta\beta$) events using $^{96}$Zr isotope. The liquid scintillator has 10wt.% concentration of Zr(iPrac)$_{4}$, which corresponds to 1.4wt.% of natural zirconium.
In order to investigate a...
Neutrinoless double-$\beta$ decay (0$\nu\beta\beta$) is an experimentally sensitive avenue to probe the nature (Majorana versus Dirac) and exact mass of neutrinos. This work [1] quantitatively explores the interplay between exposure and background levels in 0$\nu\beta\beta$ experiments at their design stage. In particular, background reduction will be playing increasingly important and...
The Gerda experiment searched for the lepton number violating neutrinoless double-beta (0νββ) decay of 76Ge. Observation of this decay would provide answers to fundamental problems in particle physics and cosmology, including the origin of neutrino masses and baryon asymmetry in the universe. The Gerda experiment achieved the most stringent lower limit on the half-life of the 0νββ-decay of 1.8...
The discovery of neutrinoless double beta decay (0νββ) would shed light on the persistent puzzle surrounding the origin of neutrino mass and help explain the matter-dominated universe. KamLAND-Zen is one of the leading experiments searching for 0νββ. The first phase of the experiment, called KamLAND-Zen 400, set a world-leading limit on 0νββ lifetime. After the conclusion of KamLAND-Zen 400, a...
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for 0νββ decay that has been able to reach the one-tonne mass scale. The detector, located at the LNGS in Italy, consists of an array of 988 TeO2 crystals arranged in a compact cylindrical structure of 19 towers. CUORE began its first physics data run in 2017 at a base temperature of...
The search for neutrinoless double beta decay 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...
The Light only Liquid Xenon (LoLX) experiment was designed to study light production in liquid xenon during the first nanosecond and gain experience with the operation of a large number of closely spaced Silicon Photomultipliers (SiPMs) in liquid xenon. The LoLX detector is a 3D printed octagonal chamber housing 96 Hamamatsu VUV4 SiPMs, 16 on top and bottom and 8 on each side of the octagon. A...
The NEXT (Neutrino Experiment with a Xenon TPC) collaboration searches for the neutrino-less double beta decay (ββ0ν) of 136Xe at the Laboratorio Subterráneo de Canfranc (LSC) (Huesca, Spain). The observation of such a lepton-number-violation process would prove the Majorana nature of neutrinos, providing also information on the neutrino mass scale. A first large-scale prototype of a...
CUPID-Mo served as a successful demonstrator experiment for CUPID (CUORE Upgrade with Particle ID), the planned next-generation upgrade of the first ton scale cryogenic calorimetric $0\nu\beta\beta$ decay experiment, CUORE (Cryogenic Underground Observatory for Rare Events). CUPID-Mo was operated at Laboratoire Souterrain de Modane in France as an array of 20 enriched Li$_{2}$$^{100}$MoO$_{4}$...
nEXO is a 5 tonne monolithic liquid xenon (LXe) time projection chamber (TPC) planned to search for the neutrinoless double beta decay of $^{136}$Xe with an estimated half-life sensitivity of $> 10^{28}$ years at 90% C.L.. Advancements were made in terms of detector design, signal modelling and data analysis to support a refined estimate of the sensitivity and discovery potential of the nEXO...
Large liquid xenon Time Projection Chambers (TPC) with multi-ton of active mass, such as PandaX-4T, have hundreds of kilogram of Xe-136 and can be used to search for neutrinoless double beta decay (NLDBD). PandaX-4T is taking commissioning data as for now at China JinPing Underground Laboratory (CJPL). We will present the detector performance at high energy and the physics potential to search...
Search for double beta decay processes (EC/EC, β+/EC, β+β+) of 106Cd was performed at the Modane underground laboratory (LSM, France, 4800 m w.e.) using the low-background multi–detector spectrometer TGV-2 and enriched 106Cd. The detector part of the TGV-2 is composed of 32 HPGe planar type detectors with the sensitive volume of 2040 mm2 x 6 mm each. The total sensitive volume of the...
SNO+ is a multi-purpose neutrino experiment located at SNOLAB. Now filled with liquid scintillator after a challenging campaign of operations during the pandemic, SNO+ is studying backgrounds in the detector and embarking on a neutrino physics program including reactor, geo and solar neutrinos. The ultimate goal of SNO+ is to deploy roughly 4 tonnes of tellurium (0.5%) in the scintillator to...
The origin of neutrino masses is one of the unsolved puzzles in particle physics. One possibility is that neutrinos have Majorana masses.We can test the Majorana nature of neutrinos by searching for neutrinoless double-beta decay ($0\nu\beta\beta$) events.CANDLE is a project which targets $0\nu\beta\beta$ events from ${}^{48}$Ca using its high Q$_{\beta\beta}$-value of $4.27\,$MeV. We...
AMoRE is a search for neutrinoless double beta decay using Mo-100 enriched crystal scintillators at an ultra-low temperature. We have understood the major background sources and how they can be reduced from a pilot stage run in the Yangyang underground laboratory. AMoRE-I is currently running with twelve $^{48\textrm{depl}}$Ca$^{100}$MoO$_{4}$ and five Li$_{2}^{100}$MoO$_{4}$ crystals with a...
There is currently interest in testing possible Lorentz invariance violation (LIV) in different physical processes. LIV effects have also been searched in the neutrino sector, mainly in neutrino oscillation experiments. However, there are LIV effects induced by a Lorentz-violating operator in the Standard Model extension (SME) theory, called countershaded operator, which does not affect the...
The Large Enriched Germanium Experiment for Neutrinoless $\beta\beta$ Decay (LEGEND) is a phased experimental effort to search for neutrinoless double-beta decay in $^{76}$Ge. The first phase uses existing resources building off the experiences of the Majorana and GERDA experiments, as well as new techniques like larger inverted coaxial detectors and an improved Argon detector system. It...
The MAJORANA DEMONSTRATOR has recently completed data-taking for its search for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{76}$Ge.
If observed, this beyond the standard model process that would prove the neutrino is a Majorana fermion and provide a path to leptogenesis in the early universe.
The experiment has completed operation of a modular array of 44 kg of high purity...
Nowadays, double beta decay searches are an important point of interest in neutrino physics: the observation of neutrinoless double beta (0$\nu$2$\beta$) decay will give essential information on neutrino masses and nature as well as on lepton number violation. The technological challenge for highly sensitive 0$\nu$2$\beta$ experiments includes the minimization of the background index in the...
CUPID-0 is the first pilot experiment of CUPID, a next-generation project to search for neutrinoless double beta decay (0νDBD) with scintillating bolometers.
The detector, consisting of 24 enriched and 2 natural ZnSe crystals, has been taking data at Laboratori Nazionali del Gran Sasso from March 2017 to December 2018 (Phase I) and from May 2019 to February 2020 (Phase II), for a total...