Conveners
Experiment
- Hiro Ejiri (RCNP Osaka University)
Experiment
- Igor Ostrovskiy (The University of Alabama)
Experiment
- Igor Ostrovskiy (The University of Alabama)
Experiment
- Andrea Pocar (University of Massachusetts, Amherst)
Experiment
- Andrea Pocar (University of Massachusetts, Amherst)
Experiment
- Giorgio Gratta (Stanford University, USA)
Experiment
- Giorgio Gratta (Stanford University, USA)
Experiment
- Kai Zuber (TU Dresden)
A search for $\alpha$ and $\beta\beta$ decays of naturally occurring osmium isotopes to the excited levels of daughter nuclei has been performed using an ultra-low-background broad-energy germanium $\gamma$ detector and an ultrapure osmium sample at the Gran Sasso National Laboratory of the INFN (Italy).
The isotopic composition of the osmium sample has been measured with a high precision...
An experiment to study double-beta decay processes in $^{106}$Cd using a $^{106}$CdWO$_4$ crystal scintillator (mass 215.4 g) enriched in $^{106}$Cd to 66$\%$ is in progress in the DAMA/R&D setup at LNGS. The enriched crystal was placed in a close geometry with two CdWO$_4$ crystal scintillators in order to increase the detection efficiency to $\gamma$'s that can be emitted in the double-beta...
Experimental studies of charge-exchange nuclear and leptonic reactions are useful for evaluating nuclear matrix elements (NMEs) for double beta decays (DBDs). The sin-dipole (SD) NME is one of the major components of the DBD NME. The experimental SD giant resonance energy and the SD strength are shown to be closely related with pnQRPA NME. The NME is obtained by using the particle hole...
The discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make neutrinoless double-beta decay, a matter-creating process without the balancing emission of antimatter, possible. The LEGEND Collaboration pursues a phased, 76Ge-based double-beta decay experimental program with a...
The ACCESS project (Array of Cryogenic Calorimeters to Evaluate Spectral Shapes) aims to establish a novel technique to perform precision measurements of forbidden beta-decays, whose spectral shape is a crucial benchmark for Nuclear Physics calculations and plays a pivotal role in Astroparticle Physics experiments. ACCESS will operate a pilot array of four tellurium dioxide crystals as...
Molybdenum-100 is one of the popular isotopes used to search for double beta decay and to study nuclear matrix elements. The half-lives of the two neutrino double beta decays of Mo-100 to the various excited states of Ru-100 were investigated with two samples of Mo-100-enriched molybdenum trioxide powders. The measurements were performed using an array of fourteen HPGe detectors, CAGe, located...
Extracting particle physics properties from neutrinoless double-beta (0nßß) decay, requires a detailed understanding of the involved nuclear structures. Still, modern calculations of the corresponding nuclear matrix elements (NMEs) differ by factors 2-3.
The high momentum transfer of Ordinary Muon Capture (OMC) provides insight into highly excited states similar to those that contribute...
The reactor neutrino anomaly and $g_A$ “quenching” in neutrinoless double-β decay are two of the outstanding issues in nuclear physics. Measurement of the first-forbidden nonunique β decay of $^{137}$Xe can provide helpful input to both issues but is difficult to perform accurately. EXO-200 is a low-background neutrinoless double-β decay experiment that used close to 200 kg of $^{136}$Xe as a...
The spectrum-shape method has been proposed to determine the effective value of the axial-vector coupling constant, $g_A$ with the vector coupling constant, $g_v = 1$ in forbidden nonunique $\beta$ decays. $^{210}$Bi nuclear is the isotope of first nonunique forbidden beta decay, the shape function of which strongly depends on the $g_A$.
Due to the short half-life of the $^{210}$Bi, the...
nEXO is a proposed next-generation liquid xenon experiment to search for neutrino-less double beta decay (0νββ) of $^{136}$Xe. The experiment will use a 5-tonne liquid xenon (LXe) monolithic time projection chamber (TPC) with xenon enriched to 90% the isotope 136. While the nEXO design is validated by EXO-200, the larger detector will employ novel techniques to collect charge and scintillation...
The gamma-ray emissions from a radiopure cerium-bromide crystal with a mass of 4381 g were measured for a total of 497.4 d by means of high-resolution gamma-ray spectrometry in the HADES underground laboratory at a depth of 500 m.w.e.
Publikation: Phys. Rev. C 105, 045801 (2022)
Neutrinoless double-beta decay (0νββ) 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 0νββ experiments. It is based on a dual heat-light readout, i.e. a...
The CUPID-Mo experiment, located in the Laboratoire Souterrain de Modane (France), is a demonstrator for the next generation 0νββ experiment CUPID. The experiment is an array of 20 enriched Li$_2$ $^{100}$MoO$_4$ bolometers and 20 Ge light detectors, working at 20 mK. The experiment has collected data from spring 2019 to summer 2020, for a total exposure of 2.71 kg.yr. Within this exposure,...
The COBRA experiment aims to search for neutrinoless double-beta decay using CdZnTe room-temperature semiconductor detectors. It is located at the Gran Sasso underground laboratory and has been operated stably for several years. In 2018, an upgrade of the COBRA demonstrator to the extended demonstrator was performed by adding nine 6 cm3 CdZnTe detectors to the existing array with 64 1 cm3...
The SuperNEMO experiment is a one-of-a-kind detector searching for neutrinoless double beta decay (0νββ). The unique design of this heterogeneous detector takes advantage of the combination of 2034 drift cells operating in Geiger Mode (tracker) with 712 plastic scintillator modules (calorimeter) placed around a 6.3kg thin foil of Se-82 – the source of the double beta decay (DBD). This design...
GERDA has been a pioneering experiment in the search for the still undetected neutrinoless double beta (0𝜈𝛽𝛽)-decay of Ge-76 and this will also hold for the successor experiment LEGEND. The discovery of this extremely rare process would prove the Majorana character of neutrinos and consequently physics beyond the Standard Model. For an explicit identification of a signal caused by the...
CUPID-0 is a pilot experiment in scintillating cryogenic calorimetry for the search of neutrino-less double beta decay. 26 ZnSe crystals coupled to bolometric light detectors were operated continuously for two years. From its successful experience comes a demonstration of full alpha to beta/gamma background separation, the most stringent limit on the 82Se neutrino-less double beta decay, as...
Many of today's double beta experiments go deep underground in order to reduce cosmic backgrounds.
Neutrons still can origin from the surrounding rock. This motivates the investigation of neutron induced reactions on the present materials with thermal but also with fast neutrons. For neutron cross section measurements it is necessary to know the applied neutron intensity.
TU Dresden runs a...
The SuperNEMO experiment was designed to search for neutrinoless double-beta decay. It is an improved version of a very successful predecessor experiment, NEMO-3. The detector uses a tracker-calorimeter technique to detect individual particles’ trajectories and energies. Energies are measured by a segmented calorimeter composed of polystyrene scintillator blocks.
The calorimeter will be...
