Coherent elastic neutrino-nucleus scattering (CE$\nu$NS) experiments at research reactors benefit from regular reactor off-periods, allowing for effective background subtraction. At commercial reactor facilities, off-periods are rare and short due to the priority of continuous energy production. In facilities with two or more reactors, temporary shutdowns for maintenance naturally introduce...
Tellurium-loaded liquid scintillators are critical for neutrinoless double-beta decay experiments, but conventional formulations face limitations in tellurium loading due to solubility and chemical compatibility issues. In this work, we develop a novel surfactant-free, water-compatible liquid scintillator based on p-dioxane, incorporating telluric acid, water, and naphthalene, with PPO as the...
A proto-neutron star (PNS) is born after a core-collapse supernova. The size of the young neutron star exceeds that of a typical neutron star and consists of dense, hot nuclear matter. In discussions of PNS evolution, neutrinos play a crucial role. It is generally understood that the emission of neutrinos leads to the cooling of the PNS. With upcoming neutrino detectors such as upgraded...
Muon veto detectors are crucial for deep underground experiments, designed to filter out cosmic muons that can mimic rare physics signals. Despite significant overburden, residual muons penetrate facilities like the future ANDES Laboratory, necessitating effective veto systems for low-background environments.
Our scientific groups are actively developing innovative muon detector designs and...
The extraordinary gamma-ray burst (GRB) 221009A, identified as the brightest GRB ever recorded, exhibited remarkable high-energy emissions as observed by the Large High Altitude Air Shower Observatory (LHAASO). We demonstrate that synchrotron self-Compton (SSC) emission from shock-accelerated electrons during the afterglow phase can account for the observed spectral energy distribution (SED)...
A Xenon ElectroLuminescence (AXEL) experiment aims to search for neutrinoless double beta decay ($0\nu2\beta$) using a high-pressure xenon gas Time Projection Chamber (TPC).
The AXEL 180 L prototype detector, developed to demonstrate the feasibility of $0\nu2\beta$ search, determines the event start timeโessential for reconstructing the z-position of ionization electron productionโby...
A Xenon ElectroLuminescence (AXEL) experiment, which is aimed at detecting neutrinoless double beta decay (0$\nu\beta\beta$) with a high-pressure xenon gas time projection chamber, is on progress. Construction of a 1000L-size detector for a demonstration of AXEL detector performance is currently underway, and some new technologies are needed to operate this large-size detector. Our detector...
AMoRE is an international collaboration to search for the neutrinoless double-beta (0ฮฝฮฒฮฒ) decay of ยนโฐโฐMo, utilizing enriched molybdate scintillating crystals. AMoRE-I, the second phase of the program following the AMoRE-Pilot, was conducted at the Yangyang Underground Laboratory(Y2L) over a period of 29 months (December 2020 โ May 2023), using an array of 18 crystals with a total mass of 6.194...
The LEGEND (Large Enriched Germanium Detector for Neutrinoless $\beta\beta$ Decay) collaboration aims to detect neutrinoless double-beta (0$\nu\beta\beta$) decay in $^{76}$Ge using enriched high-purity germanium (HPGe) detectors. In its first phase, LEGEND-200 successfully acquired physics data for over a year using 140 kg of HPGe detectors deployed in a liquid argon cryostat. LEGEND-200 has a...
The Jiangmen Underground Neutrino Observatory (JUNO) is the worldโs largest liquid scintillator detector, utilizing 20 kton liquid scintillator as target mass, and equipped with 17,612 20-inch and 25,600 3-inch photomultiplier tubes (PMTs) in its central detector for photon detection. There are two types of 20-inch PMTs in JUNO, including the MCP-PMT manufactured by Northern Night Vision...
The Jiangmen Underground Neutrino Observatory (JUNO) is the world's largest liquid scintillator detector, located in Jiangmen, South China. Its construction has been completed, and it is currently undergoing liquid scintillator filling. The central detector consists of an acrylic spherical vessel with an inner diameter of 35.4 m, filled with 20 kton of liquid scintillator. It is equipped with...
We explore for the first time the possibility that the recently detected ultra-high-energy neutrino event with an energy of 220 PeV, observed by the KM3NeT experiment, originates from the decay of heavy dark matter (DM). As a representative example, we consider a scenario where the DM is a heavy right-handed neutrino (RHN). We demonstrate that a DM mass of 440 PeV can account for the observed...
Neutrinoless double beta decay ($0\nu\beta\beta$) represents a crucial probe of new physics beyond the Standard Mode. The technology utilizing enriched germanium detectors demonstrates unique advantages in this field due to its high isotopic enrichment, ultra-low background characteristics, superior energy resolution, and scalable configuration. The CDEX Collaboration is preparing to construct...
The Cryogenic Underground Observatory for Rare Events (CUORE) is an experiment searching for neutrinoless double beta decay in a ton-scale detector, located at the Gran Sasso National Laboratory in Italy. Utilizing a detector composed of $TeO_2$ crystals, CUORE operates at millikelvin temperatures to achieve sensitive measurements of temperature fluctuations from deposited energy.
A...
A precise measurement of neutron flux is crucial for underground experiments, as neutrons may cause significant background for rare events searches. Due to the high neutron capture cross-section of the gadolinium isotopes present in the Gd$_{3}$Al$_{2}$Ga$_3$O$_{12}$ (GAGG) crystal, combined with the high attenuation coefficient for efficient detection of neutron-induced $\gamma$ rays, the...
We present a characterization of LAB-based liquid scintillator at cryogenic temperatures using a table-top setup. Measurements of relative transparency, light yield, and viscosity were performed down to approximately โ100 ยฐC. The results are discussed in the context of potential applications for the veto system inย PandaX-xT, a next-generation multi-ten-ton liquid xenon experiment searching for...
Organic liquid scintillator are one of the most exploited detection medium for neutrino detection in the past years, especially for low energy ($\sim$ MeV). Although these media have a very good light yield, allowing to perform a good energy spectroscopy of the incoming particle, organic liquid scintillator lost the information of the particle direction due to the isotropy of the scintillation...
The search for cosmic neutrino sources is a major objective of high-energy astrophysics. The ANTARES neutrino telescope, operational from 2007 to 2022 in the Mediterranean Sea, provided valuable data over 16 years, achieving an angular resolution better than 0.4ยฐ at the highest energies and offering a privileged view of the Southern sky. Following its legacy, the KM3NeT/ARCA detector is...
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20-kiloton liquid scintillator detector with the capability to detect neutrinos from the next Core-Collapse Supernova (CCSN) and effectively manage the resulting large statistics. The real-time CCSN monitoring system of JUNO is designed to provide fast and reliable alerts by tracking the increasing event rates of supernova burst...
The cosmic rays blocked by the Sun can create a deficit shadow when observed with ground-based observatories. This Sun shadow serves as a valuable tool for capturing the complete magnetic field information of solar activities, as well as the magnetic field information between the Sun and the Earth.
In this study, we will present observations of the Sun shadow using the Large High Altitude Air...
Noble liquid time projection chambers (TPCs) are essential detector technologies in dark matter searches and neutrino experiments. A key performance parameter for these detectors, whether using liquid argon or liquid xenon, is the electron lifetime. This work presents a low-noise, high-precision electron purity monitoring system developed for such applications. The system comprises two main...
The CDEX-300 is a next generation neutrinoless double beta (0ฮฝฮฒฮฒ) decay experiment aiming at searching the 0ฮฝฮฒฮฒ decay of Ge-76 using high purity germanium (HPGe) detectors. One key technology for background suppression in CDEX-300 is the liquid argon (LAr) veto, and the smooth operation and impurity control of the LAr are important for veto performance in the long-term operation. We built a...
The high-speed integrated data converters and digital data processing capability in RFSoC empower direct RF sampling without analog mixer up and down conversion for RF frequencies up to 5 GHz with more compact footprint and lower total power consumption and cost. This work reports the hardware design methodology of RFSoC, the power sub-system which include 80-A 0.85V core supply with dual...
The Deep Underground Neutrino Experiment (DUNE) is a liquid argon neutrino detector currently under construction in the United States. One key physics goal of the experiment is to observe the neutrino signal from a core-collapse supernova in our galactic neighbourhood. DUNEโs LAr-TPC design will provide unique sensitivity to the electron neutrino component of a supernova burst neutrino signal...
The Jinping Neutrino Experiment (JNE) plans to deploy approximately 3000 8-inch MCP-PMTs (GDB-6082, North Night Vision Technology) for neutrino detection. To improve photon collection efficiency while maintaining cost-effectiveness, we developed custom-designed light concentrators with a selected cutoff angle of $70^\circ$, mounted on each PMT.
We performed angular response measurements of...
Neutron-induced reactions play a central role in stellar and Big Bang nucleosynthesis. Yet many of the relevant cross sections remain poorly constrained at astrophysically relevant energies. Addressing this need, we are developing a multi-purpose Optical Time Projection Chamber (OTPC) optimized for precision neutron-reaction studies at SARAFโs upcoming high-intensity, time-of-flight neutron...
To achieve ultra-low noise level and high energy resolution in rare event searches, bolometric detectors require an extremely low-vibration working environment. In this study, we present the design, implementation, and performance evaluation of a spring-mass vibration damping system developed for a bolometric demonstrator experiment for neutrinoless double beta decay (0vฮฒฮฒ) search at the China...
In the field of direct detection of light dark matter (DM) with masses below 10 GeV/cยฒ, the DarkSide-50 experiment, based on a dual-phase argon time projection chamber (DAr-TPC), has demonstrated competitive performance. Building on DarkSide-50, the DarkSide-LowMass experiment will focus on achieving low-threshold measurements and is projected to extend the search for light DM down to the...
NTD-Ge (Neutron Transmutation Doped Germanium) is one of the crucial components in bolometer systems, boasting a large dynamic response range and high sensitivity. A group of 10N HPGe samples are irradiated by thermal neutrons with different flux at China Advanced Research Reactor. After a half-year cooling down, these samples are fabricated into NTD-Ge sensors hiring the developed...
With the increasing demands on particle detector signal processing in fields such as high-energy physics, traditional analog or digital solutions struggle to balance performance and flexibility. To address this, this paper develops an FPGA-based real-time signal processing program for particle detectors. The program integrates algorithm modules including signal shaping, pulse triggering,...
We propose a novel approach to investigate the mysterious origin of enhanced circumstellar material (CSM) surrounding a collapsing massive star using neutrinos. Here, non-thermal TeV neutrinos produced from ejectaโCSM interactions and thermal MeV neutrinos from a pre-explosion burning process are related under the assumption that CSM had been created through the pre-supernova neutrino release....
Emission of TeV gamma rays from high-emission states of nearby Active Galactic Nuclei (AGNs) can be used to put constraints on the photon density of the Extragalactic Background Light (EBL) in a region where there are not direct measurements of this background radiation field. Using HAWC observations of the AGN Mrk 421 after 10 years of data, we show preliminary evidence of the existence of...
BULLKID is a monolithic array of dice of 5.4 x 5.4 x 5.0 mm3 carved in a silicon crystal and sensed by phonon-mediated cryogenic Kinetic Inductance Detectors (KIDs). It is designed for the detection of sub-keV energy depositions from particle interactions within the crystal, making it suitable for direct Dark-Matter (DM) searches and coherent elastic neutrino-nucleus scattering (CE๐NS)...
A sensitivity study of the search for heavy sterile neutrinos ($\nu_H$) in the MeV mass range using solar neutrino experiments is presented. $\nu_H$ with masses ranging from a few MeV up to 15 MeV can be produced in the Sun through $^8\mathrm{B}$ decay and subsequently decay into $\nu_L + e^+ + e^-$, where its flux and lifetime strongly depend on the mixing parameter $|U_{eH}|^2$ and mass...
Low-background detectors, such as those used in direct dark matter searches, require high-efficient neutron veto systems to suppress nuclear recoil backgrounds. Gadolinium-doped polymethyl methacrylate (Gd-PMMA) has emerged as a promising solid-state neutron tagging material, combining high hydrogen content for neutron moderation with gadoliniumโs strong thermal neutron capture cross-section,...
The SuperNEMO Demonstrator is a double-beta-decay detector, currently taking physics data at LSM, France. It has a unique ability to measure the full topology of decay events, thanks to a tracking detector filled with a carefully-controlled gas mixture consisting of 95% ultra-pure helium, 4% ethanol, and 1% argon. To achieve SuperNEMOโs ambitious radiopurity target of 0.15 mBq/m$^{3}$, fresh...
The detection of near-TeV gamma rays from the nova RS Ophiuchi (RS Oph) has confirmed that symbiotic novae (binary system of white dwarf and red giant stars) can act as TeV scale particle accelerators. However, the origin of these gamma rays, whether hadronic or leptonicโremains uncertain due to the non-detection a corresponding high energy neutrino signal. In the hadronic scenario, gamma rays...
High-speed and high-precision pulse waveform digitization has extremely high application value in many fields such as nuclear physics experiments and medical imaging. The requirement for capturing picosecond-level pulses in the China Jinping Neutrino Experiment also poses extremely high demands on the pulse sampling rate. However, traditional solutions are mostly based on board-level circuits,...
The Spherical Proportional Counter (SPC), has a broad range of applications such as neutron detection; รร0v (neutrino physics ) and Dark Matter search. The low background detectors like SEDINE (รธ=60cm; SPC_60) and SNOGLOBE (รธ=140cm; SPC_140), both fabricated at LSM and respectively installed at LSM and SNOLab (Canada, Sudbury), are taking data as light DM detector within NEWS-G collaboration....
The New Experiments With Spheres โ Gas (NEWS-G) collaboration has designed the Spherical Proportional Counter (SPC) dedicated to searching low-mass weakly interacting massive particles (WIMPs), one of the most promising dark matter (DM) candidates. SPCs are gaseous detectors relying on ionization of light noble gases. In probing dark matter, neutrons become one of the significant background...
The Jiangmen Underground Neutrino Observatory (JUNO) is a large spherical liquid scintillator detector primarily designed to determine the neutrino mass ordering. Its central detector is a 35-meter-diameter acrylic sphere filled with 20 kilotons of organic liquid scintillator. The detector features over 17,000 20-inch PMTs and over 25,000 3-inch PMTs, with a total coverage area of 78%. Thanks...
The Jiangmen Underground Neutrino Observatory (JUNO) is a multipurpose underground neutrino detector designed primarily to determine the neutrino mass ordering. Its central detector consists of a 35.4-meter-diameter acrylic spherical vessel filled with 20 kilotons of liquid scintillator, surrounded by $\sim$17,600 20-inch and 25,600 3-inch photomultiplier tubes for high-precision detection. To...
XENONnT is a direct dark matter search experiment using 8.6 tonnes of Xe. Our observable energy threshold is few keV level, which enables us to search for physics in the low-energy electronic recoils, such as the search for events induced by solar pp neutrinos.
Kr85 is one of the background sources in such low-energy region. To achieve a high significance observation of rare physics events, a...
Introduction for some Low Noise Readout ASICs for Astroparticle Physics Research developed by institute of high energh physics,CAS. They can be used with SDD,Si-PIN,Ge,CZT,GEM and SiPM detector. And some of them can be used for polarimetry of X-ray or Compton imaging.
The COSINE-100 experiment is a direct dark matter search using 106โฏkg of NaI(Tl) crystal detectors, each with a light yield of approximately 15 photoelectrons per keV. The experiment was operated at the Yangyang Underground Laboratory in Korea, collecting 6.5 years of data. A nominal analysis has achieved a clean energy threshold of 8 photoelectrons by rejecting PMT-induced noise events. To...
LUX-ZEPLIN(LZ) and its next generation XENON-LZ-DARWIN(XLZD) are designed to search for dark matter using two-phase liquid xenon time projection chambers. LZ has been processing its WS2024 upper-limits for dark matter candidates, like axion-like particles(ALPs). Meanwhile, XLZD has been projecting sensitivity for several signalโs models, including weakly interacting massive particles(WIMPs),...
The Super-Kamiokande detector has measured solar neutrinos for more than 25 years.The sensitivity to solar neutrino measurement is limited by the uncertainties of energy scale and the background modeling. One of the major background events is the spallation products created by the cosmic ray muons in the detector water tank. Some of the negative muons stop in the tank and are captured by the...
The direction of individual AmBe $\gamma$ has been reconstructed using Jinping 1-ton prototype in slow liquid scintillator phase, with consideration of neutron-induced nuclear recoil effects. Through custom waveform analysis of readout signals, we extracted photoelectron (PE) information per trigger event, including PE number and time. Cherenkov and scintillation light were divided according...
With the continuous advancement of research on deep subsurface dark matter, low-background and low-noise detection devices have become the mainstream and hotspot of research. Low noise, high-density, arrayed sensing and amplification devices that can meet high sensitivity and energy resolution have become the key research objects of detection devices. InP devices have excellent low-temperature...
Muon-induced backgrounds present a substantial challenge for rare-event searches like neutrinoless double beta decay. To substantially reduce these backgrounds, the AMoRE-II experiment is located approximately 1,000 meters underground at the Yemilab facility in Korea. AMoRE-II employs low-temperature lithium molybdate crystal detectors along with complementary detection systems, including a...
In bolometric experiments searching for neutrinoless double-beta decay (0ฮฝฮฒฮฒ), light detectors are used to identify and discriminate between particle interactions by simultaneously detecting heat and scintillation light. This dual-readout approach is crucial for suppressing background signals, particularly for distinguishing ฮฑ particles from ฮฒ/ฮณ events, thereby enhancing sensitivity to rare...
Liquid-scintillator neutrino detectors made significant contributions in the discoveries of neutrino physics. Reconstruction of neutrino energy and position demands point-source response function (probe) of the photoelectrons reception on photomultiplier tubes. We model the probe with inhomogeneous Poisson process for calibration from Monte Carlo simulated data. To achieve higher precision...
Neutrino observations from nearby supernova (SN) bursts in underground detectors, such as Super-Kamiokande and future Hyper-Kamiokande, play a key role in understanding the SN explosion mechanism.
However, the neutrino-oxygen interaction in a few tens of MeV, which is the target energy region of SN neutrinos, is not well measured, and the neutrino information cannot be fully obtained from...
One of the most important neutrino interactions is the Inverse Beta Decay (IBD). However, the IBD events typically carry no directional information in water Cherenkov detectors as the positrons direction is mostly isotropic at low energies, such as those in supernova studies. As Gadolinium is being added to Super Kamiokande, the improved neutron capture efficiency not only allows better...
The sensitivity of the direct dark matter search is being improved by various energy-sensitive experiments such as XENONnT, LZ, Panda-X and so on. In parallel, direction-sensitive dark matter searches are designed and taken place to reveal properties of the dark matter particle after its discovery or to explore beyond the neutrino fog. NEWAGE is one of the direction-sensitive WIMP search...
The Radio Neutrino Observatory Greenland (RNO-G) is an in-ice neutrino detector currently under construction. It is designed to detect ultra-high-energy neutrinos with energies exceeding โผ10 PeV , and currently 8 of the foreseen 35 stations have been deployed and are taking data. This contribution discusses observations of solar radio bursts by RNO-G stations, which include both deep antennas...
The complex system composed of millions of electromagnetic particles in cosmic rays provides a free laboratory for studying fundamental particles. Research on this system has greatly promoted the development of physics over the past century and has also provided powerful research tools for high-energy physics and multi-messenger astronomy. Using simulated data, we have identified a new...
T2K is a long-baseline experiment using J-PARC neutrino beam to study neutrino oscillations with the near detectors and the Super-Kamiokande detector as the far detector. The T2K experiment uses a muon monitor (MUMON) to indirectly monitor the neutrino direction and intensity. Upgrade of the J-PARC beam is currently ongoing towards a measurement of CP violation in the neutrino sector.
While...
Searching for neutrinoless double-beta (0ฮฝฮฒฮฒ) decay is considered a promising approach for proving the Majorana nature of neutrinos. Background suppression is particularly important in 0ฮฝฮฒฮฒ decay searches, which are considered rare-event searches. For traditional single-electrode high-purity germanium (HPGe) detectors, pulse shape analysis methods such as A/E are effective in distinguishing...
The CUPID collaboration is advancing toward a next-generation cryogenic bolometric experiment for neutrinoless double beta decay searches, based on $^{100}$Mo-enriched scintillating crystals.
Building on the experience of the first prototype (GDPT), a new upgraded tower has been developed. The Vertical Slice Tower Test (VSTT) features an upgraded mechanical structure designed to improve the...
Coherent Elastic Neutrino-Nucleus Scattering(CEvNS) is an important scientific frontier in the field of particle physics. We conducted CEvNS experiments around the RECORDE high-purity germanium reactor and developed a plastic scintillation counter anti-coincidence detector to suppress the background of cosmic rays. For large volume plastic scintillation detectors, research has optimized...
Multi Channels 24-Bit/2 MSps high precision electronics system is designed for demand of CJPL to measure the analog signals such as high voltage, particle accelerator magnet current. Based on the dual FMC carrier board of WRX602, we present the preliminary design of 4-Channel 24-Bit/2 MSps FMC. The state-of-the-art 24-Bit SAR ADC of AD4630-24 from ADI is used and a cascade front signal...
The SABRE experiment aims to perform a model-independent search for dark matter using arrays of ultraโlow-background NaI(Tl) crystals.
The expected background rate in the ROI [1โ6] keV is on the order of 0.5 dru. To achieve this level of radiopurity, SABRE North will make use of zone refining purification process of the NaI powder.
The SABRE North collaboration has recently validated,...
The NฮฝDEx-100 experiment is designed to search for neutrinoless double-beta (0ฮฝฮฒฮฒ) decay using a high-pressure gaseous time projection chamber with SeF6 as the target medium. The detector features a front-end readout system comprising 8,192 sensors organized into 32 modular units within a single end-cap. These sensors perform ion collection and signal amplification, generating analog pulses...
The RELICS experiment employs a dual-phase xenon time projection chamber (TPC) to investigate Coherent Elastic Neutrino-Nucleus Scattering (CEฮฝNS) signals from reactor neutrinos. To improve the sensitivity of the detector, the liquid xenon in TPC needs to be ultra-pure. Electronegative impurities, induced by outgassing, can absorb the electrons created by article interactions inside the...
Liquid nitrogen is regarded as a radioactivity-free material with minimal concerns related to cosmic-rays; however, radon emissions from shielding and potential leaks can still pose challenges in the search for dark matter and neutrinoless double beta decay in the CDEX experiments. Achieving radon activity levels below sub-ฮผBq/kg is a key milestone for current rare event experiments. We have...
The search for neutrinoless double-beta decay (0ฮฝฮฒฮฒ) could shed light on fundamental questions including the Majorana nature of neutrinos, potential lepton number violation, and the matter-antimatter asymmetry in the universe. Scintillating bolometers, with their excellent energy resolution and background discrimination capabilities, represent a promising technology for next-generation 0ฮฝฮฒฮฒ...
The Water Cherenkov Test Experiment (WCTE) is a 30 ton water Cherenkov detector currently installed in the T9 beamline at CERN. It has been built as a prototype of the Intermediate Water Cherenkov Detector (IWCD) for the Hyper-Kamiokande long-baseline neutrino oscillation experiment. For Hyper-Kamiokande to achieve its physics goals, systematic uncertainties in the detection and reconstruction...
KamLAND is a neutrino detector containing a 1-kiloton liquid scintillator, located 1000 meters underground at the Kamioka Mine. The experiment completed 22 years of data acquisition in August 2024. The KamLAND2 experiment, scheduled to start in fiscal year 2027, aims to further improve light collection efficiency by increasing the luminous flux of the liquid scintillator, introducing high...
The DsTau(NA65) experiment at CERN aimed to measure an inclusive differential cross-section of Ds production with decay to tau lepton and tau neutrino in proton-nucleus interactions. The DsTau detector is based on the nuclear emulsion technique, which provides excellent spatial resolution for detecting short-lived particles such as charmed hadrons. We present the first results from the...
The ASPECT-BET project, or An sdd-SPECTrometer for BETa decay studies, aims to develop a novel technique for the precise measurement of forbidden ฮฒ spectra in the 10 keVโ1 MeV range. Accurately measuring a set of ฮฒ spectra from different isotopes using the same setup can help in ruling out those nuclear models unable to predict the spectral shapes. Experiments in the field of 0๐ฮฒฮฒ, WIMP, and...
Double beta decay to an excited state of the daughter nucleus may be considered in addition to the more probable decay to ground state. Though it suffers from a reduced phase space, the decay to an excited state has a unique experimental signature, distinguished by coincident gamma rays from the de-excitation of the daughter nucleus. So far, the two-neutrino excited state decay has only been...
PandaX-xT is a next-generation, multi-purpose liquid xenon detector at China Jinping Underground Laboratory. It is designed with a 43-ton active target mass and ultra-low background to achieve a high sensitivity for dark matter detection and neutrinoless double-beta decay search. As a passive shielding, 4 kton of water will be filled in the water pit where the liquid xenon detector is...
N$\nu$DEx experiment aims to search for the 0ฮฝฮฒฮฒ of $\mathrm{^{82}Se}$ using high pressure $\mathrm{^{82}SeF_6}$ gas TPC. Accurate track simulation and reconstruction is essential for the study of background rejection and signal identification. In this work, we present a simulation framework and preliminary study of the signal and background discrimination for the N$\nu$DEx experiment, which...
The LEGEND-200 experiment is a neutrinoless double beta decay (0ฮฝฮฒฮฒ) search experiment located in the Laboratori Nazionali del Gran Sasso in Italy. LEGEND uses a maximum of 200kg of 76Ge enriched germanium mono-crystals as both source and detector for double beta decays. These crystals are housed in a cryostat filled with liquid argon to provide an optimal operation environment as well as a...
A well-perfoming light detector are an essential prerequisite for the light-heat dual readout scheme and are therefore critical components of cryogenic crystal bolometers. Given the current lack of domestic experience in developing cryogenic light detectors, this project is dedicated to the research of germanium-based light detectors for cryogenic bolometer, which includes
- Investigation...
Coherent elastic neutrino-nucleus scattering (CEฮฝNS) signals have extremely low energy threshold, and so controlling the background in the low-energy region is crucial for the detection. RELICS is an experiment aiming to detect CEฮฝNS signals from reactor neutrinos on the ground using a dual-phase liquid xenon time projection chamber detector. Delayed electron is one of the most significant...
The dual-phase argon time projection chamber (DArTPC) has shown exceptional sensitivity and background rejection capabilities, as demonstrated by the DarkSide-50 experiment. For future dark matter detection, particularly for low-mass dark matter (<10 GeV/cยฒ), exploiting exclusive ionization signal detection (S2-only) to achieve a low detection threshold is an exciting avenue of research. In...
The Japanese gravitational wave detector KAGRA is a 2.5-generation detector built underground using cryogenic techniques. Cooling down test masses to cryogenic temperatures is a way to reduce the thermal noise of gravitational wave detectors. Crystalline materials are considered the most promising materials for fabricating cryogenic test masses and their coatings because of their excellent...
The Jiangmen Underground Neutrino Observatory (JUNO) is a multipurpose liquid scintillator detector located 700 meters underground in Jiangmen, Guangdong Province, China. It is designed to achieve an exceptional energy resolution of $3\%/\sqrt{E\left(\mathrm{MeV}\right)}$. The primary goals of JUNO are to determine the neutrino mass ordering and to achieve sub-percent precision measurements of...
For direct dark matter search experiments, radiogenic neutrons from
the detector materials are one of the most significant background
sources, since they mimic nuclear recoil signals by weakly interacting
massive particles.
In the XENONnT experiment, the xenon dual-phase time projection
chamber (TPC) is enclosed by a gadolinium-doped water Cherenkov
detector, neutron veto (nVeto), to tag...
Next-generation neutrinoless double beta decay (0$\nu\beta\beta$) experiments are poised to achieve sensitivities that fully explore the inverted mass hierarchy (IH) parameter space and begin probing the normal mass hierarchy (NH) region, marking a significant advancement in the search for Majorana neutrinos, revealing the absolute neutrino mass scale, and lepton number violation [1, 2]....
Four ultra-low background germanium spectrometers, called GeTHU, have been installed at the first phase of China Jinping Underground Laboratory (CJPL-I) and served for material screening of dark matter and neutrino experiments. Recently, a new multi-detector spectrometer with five germanium detectors has been developed and installed at the second phase of CJPL(CJPL-II) with a minimum...
The CUORE experiment, originally conceived to search for neutrinoless double-beta decay, has proven itself a versatile platform for exploring the broad landscape of rare-event physics. In this talk, we present a comprehensive study of CUORE's sensitivity to keV-scale energy physics - including dark matter interactions and rare nuclear decays. By applying specialized data selection and noise...
The knee-like structure around $4~\rm PeV$ is the most striking feature in the cosmic ray energy spectrum, whose origin remains enigmatic. Recently, the Large High Altitude Air Shower Observatory (LHAASO) provided highly precise measurements of cosmic rays in the knee region. Taking into account LHAASO measurements of the all-particle energy spectrum and the mean logarithmic mass, we propose a...
The Crab Nebula is an important object of study in gamma-ray astronomy. Since the full array operation of LHAASO-KM2A in July 2021, it has conducted long-term and efficient observations of the Crab Nebula in the very high energy (VHE) range, in the tens of TeV region. We have obtained light curves, energy spectra, and ultra-high-energy photon data from the direction of the Crab Nebula since...
Neutral-Current Quasi-Elastic (NCQE) interactions on oxygen represent a dominant background in the Diffuse Supernova Neutrino Background (DSNB) search at Super-Kamiokande. We validate NCQE background rejection observablesย by analyzing T2K neutrino beam data, corresponding to 1.76 ร 10^{20} protons on target. Three observables, multiple scattering goodness, Cherenkov angle, and reconstructed...
In large volume liquid scintillator detectors such as the center detector of Jiangmen Underground Neutrino Observatory (JUNO), the shower muons contribute most of the cosmogenic isotopes, and the isotopes are mainly produced within a few meters around the shower vertex. Cosmogenic isotopes, especially $^{9}$Li/$^{8}$He, are the main background for the JUNO's measurement of reactor neutrinos,...
The water Cherenkov veto detector in the PandaX-4T experiment has been operational since 2024. This poster gives a review of its performance, including the detector operation, calibration, and data analysis. Key results include the measurements of neutron veto efficiency and studies on gamma-ray tagging. Additionally, cosmic ray event selection and reconstruction are discussed. Finally, we...
In a laser interferometer-type gravitational wave telescope, it is necessary to observe by three or more detectors to determine the direction of source of gravitational waves with high accuracy. In the fourth observational run, KAGRA is constructed with PRFPMI consisting of a Michelson interferometer with 3 km Fabry-Perot cavity in both arms, and Power Recycled Cavity.
Wave Front Sensing...
Neutrinoless double beta decay is a powerful method for verifying Majorana neutrinos. $^{48}$Ca is one of the best candidates because it has the largest $Q$-value of decay (4.27 MeV) and is the target nucleus of the CANDLES project. Although a large number of target nuclei is essential to search for the decay with higher sensitivity, there is no established mass production method for enriched...
