Recently the sub-GeV dark matter (DM) mass region has started to be probed. To explore this region, detectors with a low energy threshold are required. Recent developments in the production of diamond crystals allow for high-quality large-mass diamonds that can be used as DM detectors. Thanks to their superior cryogenic properties, diamond detectors can reach an energy threshold in the eV...
KATRIN (Karlsruhe Tritium Neutrino Experiment) aims to measure the neutrino mass by analyzing the endpoint region of a Tritium spectrum using a high-luminosity source and a high-resolution MAC-E filter technique. KATRIN holds the current best limit on the neutrino mass of 0.8 eV, coming from the joint analysis of the first two measurement campaigns.
After KATRIN’s data taking, a detector...
We developed a low threshold detector for low mass dark matter search with a CaF2 crystal and an MMC readout. The detector was assembled to make a direct metal-metal contact between an MMC sensor and a phonon-collector film on the crystal. This new absorber-sensor geometry resulted in a signal rise-time of about 100 us and a detection threshold of about a few tens of eV. We present the...
Direction-sensitive detector with solid-state target is expected to have higher sensitivity for WIMPs window compared to conventional dark matter search using Tl:NaI and other scintillators. ZnWO4 was reported to have anisotropic of light outputs for each crystal surface excited by alpha rays. In this study, we evaluated such anisotropic effect for several crystals such as...
Double electron capture (DEC) is a rare nuclear decay process in which two orbital electrons are captured simultaneously in the same nucleus.
The measurement of its two-neutrino emitting mode provides a new reference for calculating nuclear matrix elements, while the zero-neutrino emitting mode would demonstrate a violation of lepton number conservation.The two-neutrino DEC mode in 124Xe has...
The axion was initially posed as a solution to the CP problem of QCD, but axion-like particles (ALPs) also arise in string theory and are a dark matter (DM) candidate. Most laboratory axion searches concentrate on the 0.001-0.1 meV mass range, however there is growing interest in heavier (DFSZ) axions (above 10 meV) which avoid the cosmological domain wall catastrophe[1] and may explain...
The Advanced Mo-based Rare process Experiment (AMoRE) is an underground experiment that aims to detect the neutrino less double beta decay of $^{100}$Mo isotope. Reducing the detector background to as low as possible, ideally, zero level, is one of the key requirements of double beta decay experiments. Radioactive contaminants in the construction materials, such as $^{232}$Th and $^{238}$U...
Neutrinos in the energy range from a few hundred MeV to several GeV are relevant for the study of neutrino oscillation by atmospheric neutrino observation and long baseline experiments. In this intermediate energy region charged-current quasi-elastic scattering (CCQE), single pion production, and deep inelastic scattering coexist with comparable contributions. The T2K experiment has been using...
The delayed decay of $^{77(\mathrm{𝑚})}$Ge, produced by neutron capture on $^{76}$Ge, is a potential background for the next generation neutrinoless double beta decay experiment LEGEND-1000 at the LNGS site. Based on Monte Carlo simulations, several mitigation strategies and suppression techniques have been proposed to identify and suppress this background [1,2,3]. So far, only weak...
The creation of anti-nuclei in the Galaxy has been has been discussed as a possible signal of exotic production mechanisms such as primordial black hole evaporation or dark matter decay/annihilation, in addition to the conventional production from cosmic-ray (CR) interactions. Tentative observations of CR antihelium by the AMS-02 collaboration have re-energized the quest to use antinuclei to...
The ALPACA experiment is a new project aimed at observing UHE gamma rays in the southern hemisphere. The observation site is located at 4,740 meters above sea level on Mt. Chacaltaya in Bolivia. It consists of a surface air shower array of 401 scintillation detectors and a large-area water Cherenkov-type underground muon detector array. A small surface air shower array of the ALPAQUITA, a...
Subterrestrial neutron spectra show weak but consistent anomalies at multiplicities ~100 and above [1-3]. The data of the available measurements are of low statistical significance [4] but indicate an excess of events not correlated with the muon flux. The origin of the anomalies remains ambiguous, but it could be a signature of WIMP annihilation-like interaction with a Pb target. In the...
The dark photon emerges as an additional gauge boson in a U (1) Standard Model extension and is coupled to the ordinary photon via kinetic mixing. To investigate the energy band from 6-8 eV, where photons are highly absorbent due to molecular oxygen with an absorption length on the order of cm at atmospheric pressure, we developed the Ultraviolet Range Initiated photons from Dark-photons in...
High-purity germanium detectors are used in the search for rare events such as neutrinoless double-beta decay, dark matter and other beyond Standard Model physics. Due to the infrequent occurrence of signal events, extraordinary measures are taken to reduce background interactions and extract the most information from data. An efficient signal denoising algorithm can improve energy resolution...
The Cryogenic Rare Event Search with Superconducting Thermometers (CRESST) is one of the most sensitive experiments when it comes to the direct detection of light dark matter via nuclear recoils.
At low recoil energies below 100eV, the sensitivity is currently affected by the presence of a sharply increasing event rate below a few hundred eV for which dark matter as an origin has already been...
Germanium detectors have been widely used for both dark matter and neutrino-less double beta decay experiments due to its high energy resolution, low threshold and working at medium-low temperature. Hence large scale experiments up to ~ 1t detectors have been proposed, including LEGEND and CDEX. In order to achieve best performance, readout electronics, especially the front-end electronics...
The AMoRE collaboration is engaged in experiments aimed at detecting neutrinoless double beta decay of 100Mo. The experiments utilize large molybdenum-based scintillating crystals with cryogenic sensors. The forthcoming AMoRE-II phase will use large cylindrical Li$_2$MoO$_4$ (LMO) crystals with diffusive surfaces, which helps to reduce the crystal preparation time significantly. Despite the...
The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a 26-ton gadolinium doped water Cherenkov detector with a submerged water-based liquid scintillator filled vessel. It is on-axis of the Booster Neutrino Beam (BNB) at Fermilab, and its main physics goal is to measure the neutrino cross-section which will improve the systematic uncertainties of next-generation long-baseline...
The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) experiment aims to directly detect dark matter (DM) particles via their elastic scattering off target nuclei in scintillating CaWO$_4$ crystals.
One of the stable oxygen isotopes, $^{17}$O, has a nuclear spin of 5/2. Therefore, CaWO$_4$ crystals can be used for spin-independent and spin-dependent DM searches. Due to...
CRESST is an experiment for the direct detection of dark matter, situated at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It is capable of detecting nuclear recoils down to 10 eV with an impressive sensitivity in the sub-GeV mass region. This is achieved by using cryogenic scintillation crystals as target materials. To separate background from signals a two-channel approach, measuring...
I will introduce our structured doctoral program, the International Max Planck Research School on Gravitational Wave Astronomy. Since its start in 2006 more than 160 PhD students graduated from our school. I will give an overview of our curriculum and how our early career researchers learn from each other with topics ranging from theory to experiments in gravitational wave astronomy. The...
The XENON collaboration employs dual-phase xenon time-projection chambers to search for weakly interacting massive particles (WIMPs) and other rare processes. In order to achieve high sensitivity to the WIMP-nucleon cross-section, radioactive contaminants must be carefully monitored and suppressed. One impurity particularly difficult to remove is krypton, presenting a significant challenge as...
Secondary photons in SiPMs are responsible for at least three processes: (i) internal cross-talk (ii) external cross-talk and (iii) optically-induced afterpulsing. While the internal crosstalk and afterpulsing involves photon transport within the SiPM, the external cross-talk photons escape from the surface of one SPAD and potentially: (i) reflect back into the SiPM at the surface coating...
Magnetically-levitated superconducting particles have potential as ultrasensitive inertial sensors for dark matter detection. They can be highly-isolated from their surroundings, in ultrahigh vacuum at cryogenic temperatures, and confined in dissipationless traps. They can be coupled to superconducting quantum circuits, offering the potential for sensing the particle motion beyond the standard...
Excess energy stored in NAI(Tl) crystals can cause spontaneous luminescence, and exposure to red light can release thermally induced luminescence. We can assume that stored energy can spontaneously be transformed into heat. We know that energetic particles can produce energy-storing states, and we can assume that interactions with practice can release stored energy either as luminescence or...
Cosmic-ray muons that penetrate the Super-Kamiokande detector generate hadron showers in water, producing unstable radioactive isotopes through spallation reactions. These isotopes are major background sources for neutrino observation at MeV scale and for the search for rare events. While Super-Kamiokande has started observation using ultra-pure water in 1996, gadolinium was loaded with...
The KATRIN experiment aims to measure or exclude the effective
electron neutrino mass $m_\nu$ down to 0.2 eV/$c^2$ (90 % C.L.) by measuring
the tritium beta spectrum near its endpoint $E_0$, and performing a fit
including the parameters $E_0$ and $m_\nu^2$. Since these are highly correlated,
a systematic shift influencing the obtained neutrino mass would be
visible in the endpoint and...
For over twenty-five years, the DAMA/LIBRA experiment observes an annual modulation signal that is consistent with a dark matter explanation. Under the standard halo scenario, this signal is in tension with the null results observed by other searches that utilize different target detectors. The COSINUS experiment will perform a model-independent cross-check of the DAMA/LIBRA result by using...
Several extensions of the Standard Model predict the existence of exotic feebly interacting particles (FIPs) that would be abundantly produced by supernova (SN) explosions. Some remarkable examples of FIPs are sterile neutrinos, dark photons and axion-like particles, with the common feature of interacting with electrons and positrons. In this work we constrain the amount of electrons/positrons...
The Large Enriched Germanium Experiment for Neutrinoless $\beta \beta$ Decay (LEGEND) is an experimental program searching for the neutrinoless $\beta \beta$ decay of $^{76}$Ge. The experiment is designed to reach half-life sensitivity of $10^{28}$ years. To achieve such rare event rate requires a number of measures to reduce background due to more common phenomena. A...
The next generation of skipper-CCD experiments for rare-event searches will bring new challenges for the detector packaging and read-out. Scaling the active mass and simultaneously reducing the experimental backgrounds in two orders of magnitude will require a novel high-density Silicon-based package, that must be massively produced and stored. In this work, we present the design, first...
The coherent elastic neutrino-nucleus scattering (CEvNS) process in reactor neutrino experiments has yet to be observed. We are proposing to use a dual-phase argon time projection chamber (TPC) detector with a fiducial volume of several hundred kilograms to measure the reactor neutrino CEvNS. The location of this experiment is chosen to be at the Taishan nuclear power plant in China, where the...
Cryogenic phonon detectors with superconducting thermometers achieve the strongest sensitivity to light dark matter recoils in current direct detection dark matter searches. In such devices, the temperature of the thermometer and the bias current in its readout circuit need careful optimization to achieve optimal operation conditions. This task is not trivial and has to be done manually by an...
The Cryogenic Rare Event Search with Superconducting Thermometers (CRESST) experiment aims for the direct detection of dark matter (DM). In the current low-mass DM search, a low energy threshold and a high resolution at low energies are crucial for exploring the parameter space. In the most recent CRESST Phase III, alongside hardware changes, the energy threshold could be improved using a...
The most promising strategy for demonstrating the Majorana nature of neutrinos is to observe neutrinoless double beta decay (0$\nu\beta\beta$). Measurement of the 0$\nu\beta\beta$ lifetime will provide direct insight into the absolute mass scale of neutrinos and probe the neutrino mass ordering. The next generation of 0$\nu\beta\beta$ experiments targets to probe the inverted mass ordering...
AMoRE is a series of experimental searches for the neutrinoless double beta decay of 100Mo using molybdate-based crystals, such as 40Ca100MoO4 and Li2100MoO4. AMoRE phase-II aims to use 400 bolometric crystals that contain a total of 120 kg of enriched 100Mo with an internal radioactivity background level that is below 510-6 count/kg/keV/year in the region of interest. To reach this level...
We present a multiplexed analog readout electronics system for Skipper-CCDs based on an ASIC. It allows for sub-electron noise-level operation while maintaining a minimal number of acquisition channels. In addition, it requires low-disk storage and low-bandwidth data transfer with zero added multiplexing time during the simultaneous operation of thousands of channels. We describe the...
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first tonne-scale experiment using cryogenic calorimeters. The detector is located underground at the Laboratori Nazionali del Gran Sasso in Italy and consists of 988 TeO2 crystals operated in a dilution refrigerator at a base temperature of about 10 mK. Thanks to the large exposure, sharp energy resolution, segmented...
Gauged $U(1)'_{L_\alpha-L_\beta}$ ($\alpha,\beta = e,\mu$ or $e, \tau$ or $\mu, \tau$) extension of the Standard Model results in a new $Z'$ boson, which, if ultra-light, mediates long but finite-range flavor-dependent neutrino-matter interactions. In $U(1)'_{L_e-L_\beta}$ ($\beta = \mu, \tau$) models, neutrinos interact with matter (electrons) directly via $Z'$ boson; however, in...
LEGEND-1000 is a next-generation experiment to search for neutrinoless double-beta decay of the Ge-76 isotope. This ton-scale experiment uses enriched high-purity Ge detectors surrounded by a large active liquid Ar shield, deployed deep underground. Because of the low noise and low energy thresholds of these detectors, along with the low background design of LEGEND-1000, this experiment...
Multiple viable theoretical models predict heavy dark matter particles with a mass close to the Planck mass, a range relatively unexplored by current experimental measurements. We conducted a blind search for signals from Multiply-Interacting Massive Particles (MIMPs) in XENON1T, whose unique track signature allowed a targeted analysis with only 0.05 expected background events from muons. We...
The quest for the neutron Electric Dipole Moment (neutron EDM) started more than sixty years ago and is still one of the most important tasks faced by experimental physicists. The reason is that a non-zero value of this observable would violate both the parity symmetry and the time-reversal symmetry. Such a symmetry violation may help us to explain why the Universe is essentially made of...
I present studies on a deep convolutional autoencoder originally designed to remove electronic noise from a p-type point contact high-purity germanium (HPGe) detector. With their intrinsic purity and excellent energy resolutions, HPGe detectors are suitable for a variety of rare event searches such as neutrinoless double-beta decay, dark matter candidates, and other exotic physics. However,...
Dark Matter Detection is an important issue in both cosmology and particle physics. WIMPs (Weakly Interacting Massive Particles) are one of the most promising candidates for dark matter and are being studied worldwide. The XENON group has the most sensitive detector in the world.
On the other hand, the DAMA/LIBRA group reports the annual modulation using NaI(Tl) with lower sensitivity than...
The upgrading rare event detection experiments has become increasingly urgent with updating the performance of the electronics. In the next phase of China Dark Matter EXperiment (CDEX), the electronics have been designed barely immersing in 6.5 m shielding thickness of liquid nitrogen with detector crystal, and the flexible electronic substrate (FES) composed electronics are required to be...
IAXO aims to detect solar axions as they are back-converted into X-rays along a strong magnet pointed towards the sun. Excellent spectroscopic performance, high X-ray absorption efficiency at and below 10 keV, and great potential for ultra-low background operations are features of silicon drift detectors that could facilitate this endeavour. TAXO is a two-stage project which aims to...
Cryogenic Observatory for SIgnatures seen in Next generation Underground Searches (COSINUS) will use cryogenic sodium iodide (NaI) calorimeters to search for dark matter. Recently, the construction of an underground facility at Laboratori Nazionali del Gran Sasso (LNGS) for COSINUS has been completed. The features of the COSINUS facility allow for a low background...
LEGEND-200 at LNGS is an experiment designed to search for neutrinoless double beta decay of Ge-76 by operating up to 200 kg of enriched Ge-detectors in liquid argon (LAr). To achieve ultra-low backgrounds, the LAr is instrumented to detect scintillation light emitted upon interactions with ionizing radiation, thus tagging and rejecting backgrounds. The LAr scintillation light is detected with...
We consider the mass spectroscopy of dark matter in the dark hadron model. In this model [1], the dynamical chiral symmetry breaking in the $SU(3)$ hidden color gauge sector, there exist Nambu-Goldstone (NG) bosons which are massive, because the hidden sector fermions break explicitly chiral symmetry. Therefore, these bosons are dark matter candidates. We study $SU(3)$ hidden color interaction...
The world-leading dark matter direct detection experiment XENONnT exploits a TPC-instrumented liquid Xenon active target of about 5.9 t.
In order to enhance the light collection efficiency, the TPC volume is delimited by diamond-tip shaved PTFE panels.
Radioactive isotopes contaminating these panels, directly in contact with the Xenon active mass, are responsible for generating the “surface...
The Jiangmen Underground Neutrino Observatory (JUNO), a 20 kton multi-purpose low background liquid scintillator detector, was proposed primarily to determine the neutrino mass ordering. For the sake of suppressing the radioactivity from the surrounding rocks and tagging the cosmic muons, the central detector is submerged in a water Cherenkov detector which is filled with 35 kton ultrapure...
The XENONnT experiment, located underground at the Laboratori Nazionali del Gran Sasso, uses a total of 8.6t of high-purity liquid xenon to directly search for WIMP (weakly interacting massive particle) dark matter using a dual phase time projection chamber. Most of the low-energy electronic recoil background is caused by intrinsic contamination of the xenon by Rn-222 with a half-life of 3.8d,...
MADMAX, the MAgnetized Disc and Mirror Axion eXperiment, is a novel dielectric haloscope concept to detect the axion in the mass range 40-400 ueV through enhancement of the inverse Primakoff process. The discovery of the axion could solve both the strong CP problem, fundamental in particle physics, and the dark matter problem. Currently, MADMAX uses a prototype system called CB-100 to...
Sterile neutrinos are a possible extension of the Standard Model of particle physics. If their mass is in the keV range, they are a suitable dark matter candidate. One way to search for sterile neutrinos in a laboratory-based experiment is via tritium beta decay. A sterile neutrino with a mass up to 18.6 keV would manifest itself in the decay spectrum as a kink-like distortion.
The Karlsruhe...
The ultra-clean radon-free four cylinder magnetically-coupled piston pump is a high performance gas displacement pump interesting for the usage in low background experiments dealing with noble gases as target material. Due to its low radon emanation and special cleanliness in terms of out-gassing, in addition to the high and stable performance, the four cylinder pump is currenlty operated as...
The LEGEND Collaboration advances an experimental program to search for the neutrinoless double-beta decay of $^{76}$Ge.
LEGEND-200, the first stage of this program, recently completed its commissioning process at LNGS in Italy. About 140~kg of $^{76}$Ge-enriched high-purity germanium detectors immersed in liquid argon are now continuously taking low background data.
The LEGEND experiment...
The SNO+ Experiment is a versatile multipurpose neutrino detector situated at SNOLAB, with the primary goal of searching for neutrinoless double beta decay (0νββ). After a successful operating phase as a water Cherenkov detector, the SNO+ target medium was switched to liquid scintillator to increase the light yield of the detector, thereby enabling a much richer physics programme.
In...
PandaX-4T is a currently running experiment located at China Jinping Underground Laboratory searching for dark matter particles and studying the fundamental properties of neutrinos. It uses a liquid xenon TPC where neutrons and gammas from the liquid xenon container and PMT arrays significantly contribute to the total background. This poster presents the effort to build an active neutron and...
136Xe nuclei capture electron neutrinos through charged-current (CC) interactions, leading to the excited states of 136Cs: (ν_e + 136Xe → e^- + 136Cs*). This process can be used for solar neutrino measurements and fermionic dark matter searches.
The recent observation of low-lying isomeric states in 136Cs* with lifetimes on the order of 100 ns [1] implies that the CC interaction can be...
The CUORE (Cryogenic Underground Observatory for Rare Events) experiment at Gran Sasso National Laboratory in Italy primarily searches for neutrinoless double-beta decay of $^{130}$Te. The CUORE detector consists of a close-packed array of 988 TeO$_2$ calorimetric detectors cooled to ~10 mK using a custom-built cryogen-free dilution refrigerator. The experiment is the first to demonstrate...
The Jiangmen Underground Neutrino Observatory (JUNO) is a multipurpose neutrino experiment that aims to determine the neutrino mass ordering (NMO) and to precisely measure the oscillation parameters using reactor neutrinos. Atmospheric neutrinos can also contribute to the NMO sensitivity with a complementary approach: using the matter effects on neutrino oscillations. This poster will present...
The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation neutrino experiment under construction in South China. JUNO has great potential to detect atmospheric neutrinos with good flavor identification capability thanks to the large-scale and high photo-coverage liquid scintillator (LS) detector. There will also be $\nu_\tau$ produced by the oscillation of the other two flavor...
LEGEND-200 is the first phase of LEGEND, a $^{76}$Ge-based experiment designed to observe a lepton number violating process: neutrinoless double-beta $(0\nu\beta\beta)$ decay. Observation of this process would demonstrate neutrinos to be Majorana particles. The first 101 enriched $^{76}$Ge detectors, with a total mass of 142 kg, have been installed and are currently taking data at the...
Next generation neutrinoless double beta experiments aims at covering the inverted hierarchy region of the neutrino mass spectrum, with sensitivities on the half-lives greater than 10$^{27}$ years. The CUPID experiment will exploit cryogenic calorimeters to search for neutrinoless double beta decay of $^{100}$Mo. To reach the target sensitivities one of the key requirements is the control of...
The analysis of cryogenic detector data is known to be challenging for any experiment. The main difficulty for the analysis of these detectors is the background rejection since they suffer from the presence of several different pulse shapes which need to be discriminated down to very low SNR
conditions.
Background reduction is particularly important for the NUCLEUS experiment since the aim...
The Cryogenic Underground Observatory for Rare Events (CUORE) experiment is an ongoing search for neutrinoless double beta decay located at the Gran Sasso National Laboratory (LNGS) in Italy. Our previous work has shown that the quality of CUORE data can be improved with noise decorrelation algorithms using data from auxiliary devices including microphones, accelerometers, and seismometers. In...
The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose physics underground experiment in southern China. Its central detector mainly consists of a 20-kton liquid scintillator and more than 17,000 20-inch photomultiplier tubes. A dedicated multi-messenger trigger system has been developed to maximize JUNO’s potential for astrophysics events, lowering the data-taking threshold...
CUPID (CUORE Upgrade with Particle IDentification) is a next-generation experiment planning to search for the
neutrinoless double-beta decay with bolometric detectors, featuring 250 kg of $^{100}$Mo. The detector will be operated
in a custom cryostat at the Gran Sasso National Laboratory (Italy), which is currently hosting the
CUORE experiment, a large array of TeO$^{2}$ bolometers. CUPID...
To study rare nuclear processes like neutrinoless double beta decay or dark matter scattering of atomic nuclei, a sensitive detector with a very low background is needed. To reduce the background components from cosmic rays, such a detection system is often located deep underground with an anti-cosmic veto. The background of the experiment is therefore dominated by natural radioactivity in the...
The long baseline neutrino experiment T2K has successfully used Monte Carlo simulations for the neutrino flux predictions in both near and far detectors, which are essential inputs for different neutrino oscillation and cross section analyses. However, the current simulation software is based on FLUKA and the no-longer maintained simulation package GEANT3, which is becoming difficult to...
In the past years, the increasing interest in the search for neutrinoless double beta decay ($0\nu\beta\beta$) brought the collection of an impressive amount of two-neutrinos double beta decay ($2\nu\beta\beta$) data, opening the possibility to investigate exotic $2\nu\beta\beta$ decays. In this category we include all those processes not allowed by the Standard Model (SM) and whose signal...
Effects beyond-standard oscillation (BSO) are being studied as they can modify the framework of the standard oscillation due to second-order contributions. In this work, we investigate the sensitivity of the DUNE experiment to observe such BSO effects as we increase their intensity, for which we include different BSO hypotheses. The BSO hypotheses considered in this work are: neutrino decay...
SNO+ is a kilo-tonne scale neutrino detector with the primary goal of searching for neutrinoless double beta decay in tellurium-130. The inner vessel of the SNO+ detector is currently filled with an organic liquid scintillator, which will be doped with the double beta isotope. While liquid scintillator detectors are ideal tools for neutrinoless double beta decay searches due to their...
The discovery of neutrinoless double beta decay (0νββ) would be a huge step in the understanding of the nature of the neutrino. SuperNEMO is an experiment designed to search for 0νββ, whose demonstrator module is located in Modane Underground Laboratory in France (4800 m.w.e). It uses a unique technique combining a tracker and a segmented, scintillator-based calorimeter that allows us to...
The ACCESS (Array of Cryogenic Calorimeters to Evaluate Spectral Shapes) project aims to develop cryogenic calorimeters to perform a precise study of the spectral shape of forbidden β-decays. These strongly suppressed processes can help to clarify the long-standing issue of the axial coupling constant ($g_A$) quenching involved in nuclear physics calculations. Moreover, such rare decays are...
CUORE is a ton-scale experiment, consisting in an array of 988 cryogenic calorimeters, designed for the search of the neutrinoless double beta ($0\nu\beta\beta$) decay of $^{130}$Te. One of the crucial parameters in defining the sensitivity to such a rare event is the detectors energy resolution.
CUORE is taking data since 2017. During the years, we observed that the energy resolution is...
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kt liquid scintillator detector equipped with around 17,000 20-inch PMTs as well as 25,000 3-inch PMTs located 700 meters underground in southern China. It features a broad physics program with a primary goal of determining the neutrino mass ordering to 3σ in about 6 years. With an unprecedented energy resolution of...
KATRIN is probing the effective electron anti-neutrino mass by a precision measurement of the tritium beta-decay spectrum near the kinematic endpoint. Based on the first two measurement campaigns a world-leading upper limit of 0.8 eV (90% CL) was placed. New operational conditions for an improved signal-to-background ratio, the steady reduction of systematic uncertainties and a substantial...
KM3NeT is a deep-sea neutrino observatory under construction at two sites in the Mediterranean Sea. The ARCA telescope (Italy), aims at identifying and studying TeV-PeV astrophysical neutrino sources, while the ORCA telescope (France), aims at studying the atmospheric neutrino oscillations in the few GeV range. Since they are optimised in complementary energy ranges, both telescopes can be...
LEGEND-200 is the first phase of a two-phased experiment pursued by the LEGEND Collaboration to search for neutrinoless double-beta decay ($0\nu\beta\beta$) in Germanium-76 (Ge-76). Discovery of $0\nu\beta\beta$ would demonstrate lepton-number non-conservation while providing critical insight into the nature of the neutrino and its role in the universe. LEGEND-200 recently completed...
The contribution reports about the commissioning of an ultra low-level 𝛾-ray counting setup in the shallow-underground laboratory Felsenkeller in Dresden, Germany. It includes a high-purity germanium detector of 163$\,$% relative efficiency within passive and active shields. The passive shield consists of 45$\,$m rock overburden (140 meters water equivalent), 40cm of low-activity concrete, 15...
PMT waveform analysis is essential for high precision measurement of position and energy of incident particles in liquid scintillator (LS) detectors. JUNO is a next generation high precision neutrino experiment with a designed energy resolution of 3%@1MeV. The accuracy of the reconstruction of number of photo-electron (nPE) is one important key of achieving the best energy resolution. This...
HALO, the Helium and Lead Observatory, has been operating at SNOLAB for eleven years as a low-maintenance, high-livetime supernova neutrino detector. Since October 2015 HALO has been providing low threshold and very low latency supernova alarms to the SuperNova Early Warning System (SNEWS) coincidence servers. The HALO detector is principally composed 79 tonnes of lead, from a decommissioned...
The Jiangmen Underground Neutrino Observatory (JUNO) is the largest underground liquid scintillator experiment in the world, currently under construction in southern China. In its central detector, a 20-kton liquid scintillator in an acrylic vessel works as a neutrino target and is viewed by more than 17,000 20-inch photomultiplier tubes and more than 25,000 3-inch photomultiplier tubes. The...
LEGEND-1000 is a next-generation ton-scale experiment searching for neutrinoless double beta decay of $^{76}$Ge using p-type, high-purity germanium detectors. The experiment is planned for 1000 kg of Ge detectors enriched to more than 90$\%$ in $^{76}$Ge.
The experiment is going to be installed in an underground laboratory (SNOLAB at 6000 mwe or LNGS at 3800 mwe) to reduce direct and...
The current technology of thermal detectors for rare events physics is based on large cryogenic calorimeters read with NTD thermistors (es. CUORE, CUPID). Measuring the energy deposition via the heat release in the crystals allows for optimal energy resolutions when the detectors are operated at 10mK. In case of scintillating crystals, a double readout of heat and scintillation light allows...
Xenon-based detectors are powerful tools in the search for low energy signatures of new physics. Here we report on experimental results that open up a new channel for rare event searches in these detectors: MeV-scale charged-current interactions on $^{136}$Xe nuclei. These interactions populate low-lying 1+ excited states in $^{136}$Cs, which then relax to the ground state. We have performed...
The nEXO experiment is a planned five-tonne liquid xenon time projection chamber to search for the neutrinoless double beta decay of $^{136}$Xe with a projected half-life sensitivity of 1.35⨉10$^{28}$ years. To achieve optimal energy resolution in nEXO, charge and light signals must be reconstructed to sufficient precision. For charge signals, this requires accurately modelling and correcting...
We present the concept and design of the P2 detector for measuring the temperature rise and scintillation light in a scintillating crystal at mK temperature. P2 is based on low temperature metallic magnetic calorimeters (MMCs) and it features both photon and phonon detectors structured on a single 3’’ Si wafer.
The photon sensor consists of a Nb superconducting stripline pickup coil...
The Jiangmen underground neutrino observatory (JUNO) is a neutrino project under construction with a 20-kton liquid scintillator detector, which includes 20000 20-inch PMTs(15000 MCP-PMTs and 5000 dynode-PMTs). As a key component of JUNO detector, the performance of 20-inch PMTs(LPMTs) has a significant impact on the energy and timing measurement and the vertex reconstruction of anti-electron...
I will discuss a scotogenic model for generating neutrino masses through a three-loop seesaw. It is a minimally extended inert doublet model with a spontaneously broken global symmetry $U(1)'$ and a preserved $\mathbb{Z}_2$ symmetry. The three-loop suppression allows the new particles to have masses at the TeV scale without fine-tuning the Yukawa couplings. The model leads to a rich...
Pre-supernova neutrinos are released by thermal pair production and/or weak interaction prior to supernovae.
These neutrinos can offer a unique possibility for early alarm system prior to supernovae for astronomical detectors, including gravitational wave detectors and neutrino detectors.
KamLAND is a 1-kiloton liquid scintillator neutrino detector located in Japan that employs delayed...
This paper reports the preliminary design of waveform digitizer “WRX0608A1” for Jinping neutrino experiment at CJPL. Single block digitizer can support 6-channels 1GSPS, 13-bit sampling. The WRX0608A1 is a 12-layer PCB, hosting 6 ADCs, one FPGA (Xilinx Kintex 7 XC7K325T), one PLL (TI LMK04803), one DDR3 SODIMM (Micron MT8KTF51264HZ-1G9P1), one re-driver (TI DS125BR820), two QSFP interfaces and...
The construction of a worldwide network of gigaton-scale neutrino telescopes aims to address multiple open questions in physics, such as the origin of astrophysical neutrinos and the acceleration mechanism of high-energy cosmic rays. Besides astrophysics, neutrino telescopes probe center-of-mass energies similar to colliders, offering an additional window into high-energy particle...
The CONUS experiment aims to detect coherent elastic neutrino nucleus scattering ($\mathrm{CE\nu NS}$). For this goal four $1\,\mathrm{kg}$ point-contact high-purity germanium detectors were operated near the $3.9\,\mathrm{GW_{th}}$ core of the Brokdorf nuclear power plant. A very good background suppression is crucial for the success of the experiment. Pulse shape discrimination (PSD) offers...
SuperNEMO is searching for the hypothesised lepton-number-violating process, neutrinoless double-beta decay (0vbb). The detector is based on the tracker-calorimeter technique, where the trajectories of the charged particles are first reconstructed, before the energies of the electrons being measured. The SuperNEMO Demonstrator is currently taken data with the full tracker and...
Coherent Elastic Neutrino-Nucleus Scattering, also known as CEvNS, describes the physical process of atomic nucleus scattering with neutrino as a whole, and the scattering cross section is approximately proportional to the square of atomic nucleus neutron number. The research on CEvNS has important scientific significance and application value. The RECODE project (Reactor neutrino COherent...
Baikal Gigaton Volume Detector (Baikal-GVD) is a neutrino telescope being constructed in the deepest freshwater lake in the world – Lake Baikal. It is designed to observe astrophysical neutrinos through detection of Cherenkov radiation emitted by the products of neutrino interactions. The Baikal-GVD is a three-dimensional array of photomultiplier tubes (contained in optical modules) arranged...
The Karlsruhe Tritium Neutrino (KATRIN) experiment has the goal to determine the effective electron antineutrino mass with a sensitivity of 200 meV/$c^2$ @90%C.L. The main spectrometer background is the strongest limit on the sensitivity. It consists presumably of low energy electrons which arrive at the detector with small angles contrary to the signal electrons. Designing an angular...
Slow organic and water-based liquid scintillators are currently developed and characterized for future large-scale neutrino experiments such as Theia. One goal of these new scintillators is to separate Cherenkov light from scintillation light in a detector. By that, the spatial information improved while keeping the excellent energy resolution of proven organic mixtures.
This contribution...
The KATRIN collaboration aims to determine the effective electron anti-neutrino mass with a target sensitivity of $0.2\,$eV/c$^2$ ($90\,\%$ CL). To this end, KATRIN is currently performing high-statistics and high-resolution measurements of the tritium $\beta$-electron spectrum close to the endpoint region.
In addition to the neutrino mass search, the measured $\beta$-spectrum can be analysed...
The Baikal Gigaton Volume Detector (Baikal-GVD) is a 3-dimensional array of optical modules located 1366 metres deep in Lake Baikal. It is designed to detect high-energy neutrinos coming from galactic and extragalactic sources. Currently (year 2023) the detector consists of 3456 optical modules grouped into clusters. Each cluster is connected to shore with individual optoelectric cable (~ 6km)...
Coherent elastic neutrino-nucleus scattering (CEνNS) is a process well understood within the Standard Model. A high-precision study of CEνNS can be used to probe the Standard Model and reveal potential non-standard interactions. NUCLEUS is an experiment aiming to conduct such a high-precision measurement at the EdF Chooz-B nuclear power plant in France. The experiment is currently under...
The SNO+ collaboration is operating a kilo-tonne scale liquid scintillator detector located at the SNOLAB underground facility in Sudbury, Canada. The major physics goal of the collaboration is to search for neutrinoless double beta decay with 130Te. A method has been developed to load tellurium into liquid scintillator so as to permit searches for neutrinoless double beta decay with high...
Flavor-dependent long-range leptonic force mediated by an ultralight and neutral gauge boson $Z'$ associated with $L_\mu -L_\tau$ symmetry constitutes a minimal extension of the Standard Model. Assuming $Z-Z'$ mixing, we study the physical consequences of such long-range force in the oscillation of atmospheric neutrinos. We show that the proposed atmospheric neutrino detector ICAL will be able...
The international CUPID-Mo collaboration for 0νββ experiment uses the NTD photothermal readout system. Based on the exsiting scheme and experience, we plan to use the advanced TES photothermal dual readout detection for Cupid-China 0vββ Experiment next stage. This report focuses on the regulated preparation of TES superconducting thin films working in the temperature range of 10-20 mK. Also,...
The importance of predicting neutron multiplicity associated with neutrino interactions has increased. This study focuses on residual nuclear deexcitation, which contributes to neutron multiplicity, and aims to accurately predict this process.
Liquid scintillator (LS) detectors such as KamLAND can detect ~100% of 2.2 MeV gamma rays emitted by neutron capture. They are suitable to observe...
Future long-baseline experiments will be able to probe hitherto unexplored regions of sterile neutrino parameter space for masses ranging from meV to eV. We present an analytic calculation of the neutrino conversion probability $P(\nu_\mu \to \nu_e)$ in the presence of sterile neutrinos, with exact dependence on $\Delta m^2_{41}$ and matter effects. We further express the neutrino conversion...
Understanding the internal radioactive background contributions in its 20-kiloton liquid scintillator (LS) target is essential for the success of the JUNO reactor neutrino experiment. OSIRIS is a 20-ton radiopurity detector at the end of JUNO’s LS purification chain screening 1/10 of the LS during the filling of JUNO and verifying that the radiopurity requirements are met. After the filling...
