Lee, Hyun Min
Director of CAU High Energy Physics Center
Sharif Khan
Young-So Choi
The Coherent elastic neutrino-nucleus scattering (CEvNS) was first predicted in 1974. It is the dominant neutrino scattering process below 100MeV. Though CEvNS has the most significant cross-section of low-energy neutrino scatterings, it has eluded detection for over 40 years due to technical difficulties in building low-energy thresholds and low background detectors. In 2017 and 2021, the...
In this paper, we study a non-minimal gauged $U(1)_{L_{\mu}-L_{\tau}}$ model, where we add two complex singlet scalars, three right-handed Majorana neutrinos (RHN), and a vector-like dark fermion to the Standard Model (SM), all non-trivially charged under the extra gauge symmetry. The model offers an easy resolution to the muon $(g-2)$ anomaly, which fixes the scale of spontaneous symmetry...
The Reactor Experiment for Neutrinos and Exotics (RENE) aims to search for sterile neutrinos in the Δm₄₁² ~ 2 eV² region through precision measurements of reactor antineutrino oscillations. The detector is planned to be installed in the tendon gallery of the Hanbit Nuclear Power Plant in Yeonggwang, Korea, at a baseline of approximately 20 meters from the reactor core. The prototype detector...
In the Standard Model, neutrinos are predicted to have zero mass. However, the discovery of neutrino oscillations has proven that neutrinos possess mass, making neutrino research a promising avenue for exploring Beyond the Standard Model (BSM) physics. Detectors designed to track particles such as neutrinos operate by utilizing interactions between the particles and the detector material....
The Reactor Experiment for Neutrinos and Exotics (RENE) is designed to detect sterile neutrinos using a gadolinium-loaded liquid scintillator (Gd-LS) detector. Optical photons are detected by two 20-inch photomultiplier tubes (PMTs). To evaluate the detector response, energy calibration was performed using various radioactive sources, including 137Cs. 60Co, 252Cf, and Others. In this...
This study briefly describes the measurement of CT images and HU values of liquid scintillation detector solutions mixed with contrast agents using acetone as a solution. To date, scintillation detectors were composed of liquid scintillation detector solutions, but most high-energy scintillation detectors use various substances such as PPO or POPOP mixed with LAB. Because these scintillation...
The IceCube Neutrino Observatory has fulfilled the vision of detecting neutrinos to explore the vibrant Universe in terms of the particle physics and astrophysics. Situated in a cubic kilometer of clear Antarctic ice at a depth of 2 kilometers, IceCube utilizes Cherenkov radiation to detect neutrinos across a broad spectrum of energies (GeV-PeV). This poster provides an overview of IceCube...
This presentation provides an overview of Korean IceCube activities based on two posters presented in this workshop.
Infrared (IR) spectroscopy offers a powerful approach to analyzing the purity of linear alkyl benzene (LAB)-based liquid scintillators.
While previous studies have largely focused on electronic transitions using ultraviolet-visible spectroscopy, this work explores the vibrational
transitions captured by IR spectroscopy. By examining the unique IR spectral characteristics of these solutions,...
In this study, we developed a novel liquid scintillator using acetone as the base solvent and examined its physical and optical properties. We explored the optimal mixing ratios of acetone, water, and fluors for the scintillator composition. Additionally, we conducted gamma and neutron discrimination analysis by incorporating enriched 6Li, known for its high neutron capture cross section....
This talk serves as an introduction to the RENO (Reactor Experiment for Neutrino Oscillation) and RENE (Reactor Experiment for Neutrino and Exotics) experiments, outlining their scientific objectives and recent progress. RENO has played a key role in precisely measuring the reactor mixing angle $\theta_{13}$ and continues to contribute to our understanding of neutrino oscillations through...
The RENO (Reactor Experiment for Neutrino Oscillation) and RENE (Reactor Experiment for Neutrino and Exotics) experiments are key components of Korea’s reactor neutrino research program. RENO has successfully measured the neutrino mixing angle $\theta_{13}$ with high precision using two identical detectors located at near and far distances from a nuclear power plant. It continues to provide...
The second phase of J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source(JSNS^2-II) experiment aims at searching for the sterile neutrinos using a neutrino beam produced by a 3 GeV proton accelerator via muon decay at rest. This experiment has entered its second phase, employing two liquid scintillator detectors located at near and far positions from the neutrino source....
We present the results of searches for nucleon decays via p -> nu pi+ and n -> nu pi0 using a 0.484 Mt yr exposure of Super-Kamiokande I-V data covering the entire pure water phase of the experiment. Various improvements on the previous nucleon decay search, which used an exposure of 172.8 kt yr, will be discussed. Sensitivities are expected to be 1.410^32 yr for p -> nu pi+ and 0.510^33 yr...
We performed sensitivity studies on the CP phase and mass ordering for candidate sites of a deep undersea Korea Neutrino Observatory detector. The undersea detector has its candidate sites in the East Sea of Korea and receives a neutrino beam from J-PARC. The quarter-megaton scale undersea detector at the optimal site will identify the correct mass ordering for all possible CP phase values and...
The Reactor Experiment for Neutrinos and Exotics (RENE) aims to search for sterile neutrinos by measuring neutrino oscillations at a short baseline of ~24 meters from the reactor core at the Hanbit Nuclear Power Plant in Yeonggwang, Korea. The detector consists of a target region filled with liquid scintillator containing 0.5% gadolinium (Gd-LS) and a surrounding gamma catcher filled with...
The J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source (JSNS2) experiment aims to search for sterile neutrino oscillations using a neutrino beam from muon decays at rest. In addition to the existing JSNS2 detector in operation (near detector), the 2nd detector (far detector, JSNS2-II) is under construction to improve the search sensitivity.
Likewise, for the near detector,...
The NEON experiment is dedicated to the observation of coherent elastic neutrino-nucleus scattering (CEvNS) using NaI(Tl) detectors near the Hanbit nuclear reactor. The experiment has collected extensive reactor-on and reactor-off data to study CEvNS signals and optimize background modeling. Deep learning techniques based on ResNet-CNN are being developed to enhance CEvNS signal identification...
The Neutrino Elastic Scattering Observation with NaI(Tl) (NEON) experiment is designed to detect coherent elastic neutrino-nucleus scattering (CEvNS) using reactor anti-electron neutrinos with a 16.7 kg NaI(Tl) detector. By employing a novel crystal encapsulation technique, the experiment achieves enhanced light collection efficiency, yielding 25.6 photoelectrons per keV. The NEON detector is...
The RENE (Reactor Experiment for Neutrinos and Exotics) experiment aims to search sterile neutrino oscillation around Δm₄₁² ~ 2 eV² . As a short-baseline reactor neutrino experiment, a RENE prototype detector is to be positioned in the tendon gallery of the Hanbit Nuclear Power Plant in Yeounggwang, about 24 meters from the reactor core.
A veto detector, consisting of 15 plastic...
The study focuses on synthesizing organolead perovskite quantum dots with the aim of incorporating them into use in liquid scintillators. To date, there have been no examples of employing perovskite structures in particle detectors for high-energy or nuclear physics, which making this study an exploration of a next-generation liquid rscintillator material. Currently, most laboratory syntheses...
The RENO collaboration has measured the amplitude and frequency of reactor antineutrino oscillations. Recently, we published an updated result on the reactor antineutrino oscillation parameters using neutron capture on Gadolinium (n-Gd) using a full 3800-day dataset. The antineutrinos can also be detected via the inverse beta-decay process and subsequent neutron capture on Hydrogen (n-H). In...
The Reactor Experiment for Neutrinos and Exotics (RENE) aims to search for the sterile neutrino at Δ𝑚_41^2 ~ 2 eV^2 region by measuring reactor neutrino oscillation. The RENE experiment will be conducted at Hanbit nuclear power plant in Yeonggwang, Korea. The RENE prototype detector consists of a 350 L target with liquid scintillator (LS) containing 0.5% gadolinium and a box-shaped gamma...
