CPNR-OMEG Joint Workshop on Neutrino, Nuclear, and Nuclear Astrophysics

May 21, 2026, 11:00 AM → May 23, 2026, 6:00 PM Asia/Seoul

1st floor, Science hall (Chonnam National University, Natural Science Building No. 1)

Ji Young CHOI (Chonnam National University), Kyung Kwang Joo (Chonnam National University), Jubin Park (Soongsil University and OMEG institute), Myung-Ki Cheoun (Soongsil Univ), Sang Yong KIM (Chonnam National University)

 

CPNR-OMEG (Center for Precision Neutrino Research  - Origin of Matter and Evolution of Galaxies) Joint Workshop

This workshop will cover neutrino, nuclear, and nuclear astrophysics and consists of invited talks from both experimental and theoretical perspectives. 

We hope that this program will be a valuable time and beneficial event not only for students and professors, but also for researchers interested in neutrino, nuclear, and nuclear astrophysics. 

 

• Date: 2026.05.21 (Thu) 11:00 - 05.23 (Sat) 18:00
• Scientific Program: 2026.05.21 (Thu) 13:00 - 05.23 (Sat) 12:00
• Place: Chonnam National University, Natural Science Building #1, 1st floor, Science Hall
• Contact: honolov@ssu.ac.kr, opercjy@gmail.com, kkjoo@chonnam.ac.kr, cheoun@ssu.ac.kr

Zoom address : https://jnu-ac-kr.zoom.us/j/88326732597

Registration:

Participants are kindly requested to complete the registration form. The form includes an option to indicate participation in the Saturday excursion to Mudeungsan National Park.
Registration deadline: 2026. 05. 20

Excursion:

A workshop excursion to Mudeungsan National Park in Gwangju will be organized on Saturday afternoon, May 23, 2026. 
Participants are welcome to join the excursion after the scientific program. Detailed information on the schedule, transportation, and meeting point will be announced later.

Local Organizing Committee

Kyung Kwang Joo (CNU), Sang Yong Kim (CNU), Ji Young Choi (CNU), Da Eun Jung (CNU), Sun Kyu Lee (CNU), Sunwoo Gwon (CNU)

Scientific Program Committee

• Ji Young Choi (CNU)
• Jubin Park (SSU) 

Hosting Institutes

• Center for Precision Neutrino Research (CPNR)
• Institute for Universe and Elementary Particles (IUEP)
• Global-Learning & Academic research institution for Master’s · PhD students, and Postdocs (LAMP) Program, CNU
• Origin of Matter and Evolution of Galaxies (OMEG)

Partner organization 

•    Doctor Green Energy Co., Ltd.

Secretariat

• Eun Jeong Kim <k57581126@chonnam.ac.kr>, 062-530-4790
• Min Gang Kim <kmk971@chonnam.ac.kr>, 062-530-4789
• Jeong Yeon Kim <jeongyeonk9@chonnam.ac.kr>, 062-530-0807

 

Thursday, May 21

Registration

Welcome and Opening Remarks (CPNR-OMEG relationship history)

Convener: Kyung Kwang Joo (Chonnam National University)

Afternoon session: OMEG I

Convener: 상호 김

1 OMEG 1 - Neutrino and Photon in the cooling phase of Supernova, RHIC and Early Universe

Core collapse 초신성 폭발때 발생하는 Cooling Phase 에 대한 최근 연구를 정리합니다. 이때 생기는 Photon 및 Neutrino 가 Cooling 에 기여하는 과정을, 다른 Hot Nuclear Matter 인 초기우주 및 Relativistic Heavy Ion Collison 등과 비교하여 Neutrino 에 의한 Cooling Process 의 결과를 이야기 하고자 합니다.

Speaker: Prof. 명기 천

2026 0521 Supernova Luminosity_CPR_short.pptx

2 OMEG 2 - TOPSEGI: A Flexible Python Program for High-Resolution Infrared Molecular Analysis.

TOPSEGI is a Python-based program developed to calculate the excitation temperature ($T$) and total column density ($N$) of molecules and isotopologs observed in various astrophysical environments, such as planetary atmospheres, satellites, comets, and carbon-rich stars. The program utilizes high-resolution infrared spectral data, such as those from the Stratospheric Observatory for Infrared Astronomy (SOFIA), to precisely analyze $T$ and $N$. To overcome the limitations of the conventional rotation diagram (RD) method, where the inferred $N$ depends on $T$, TOPSEGI estimates both variables by employing a quadtree and $\chi^2$ minimization, thereby improving precision and reducing computational cost. Additionally, the program can extend its capabilities to isotopologs not covered in molecular spectroscopic databases, including HITRAN, ExoMol, and GEISA, by supplementing rotational and centrifugal distortion constants through density functional theory calculations, such as B3LYP. Moreover, it is applicable to any molecules or isotopologs as long as appropriate spectral data are provided. For example, we present a TOPSEGI-based analysis of hydrogen cyanide (HCN) and hydrogen isocyanide (HNC) molecular isotopologs in Orion IRc2. In the Integral Shape Filament (ISF) in Orion, the HCN/HNC intensity ratio investigated through the emission of the ground-state transitions is known as a chemical thermometer for the $15-40$ K range. However, we analyze the spectra of the Orion IRc2 region at higher temperatures of about $100-200$ K. Using $\chi^2$ minimization for the HCN and H$^{13}$CN lines, we derive a $^{12}$C/$^{13}$C ratio of $12.43^{+1.23}_{-1.20}$, with the uncertainty reduced by about 42% compared to the RD result of $12.61 \pm 2.07$. This program offers a robust and flexible tool for the precise analysis of interstellar molecules, enabling the straightforward calculation of molecular properties from high-resolution spectroscopic data, with wide potential for future astrophysical research.

Speaker: Mr 민규 이

TOPSEGI A Flexible Python Program for High-Resolution Infrared Molecular Analysis_ver2_print.pptx

3 CPNR 1 - HK:Hyper-Kamiokande experiments and its physics potential

Hyper-Kamiokande is a next-generation underground water Cherenkov detector. Scheduled for completion in 2027, it is expected to begin data taking in 2028. Hyper-K is a multi-purpose detector designed to study neutrino oscillations, diffuse supernova neutrinos, proton decay and leptonic CP violation. With a fiducial volume eight times larger than Super-Kamiokande, and enhanced, high-efficiency photomultiplier tubes, the detector is expected to achieve highly sensitive measurements. Preparations for the upcoming data taking are underway. In this talk, I will present the current status of these activities and outline the Hyper-Kamiokande experiment's expected physics prospects.

Speaker: Mr 준교 오 (전남대)

Junkyo_HK_cpnr_omeg_workshop.pdf

Coffee break & Photo

Afternoon session: CPNR I

Convener: 은자 하

4 OMEG 3 - Impact of g_A quenching and effective mass in dense matter on type-II supernovae in GR1D Simulations

Neutrino transport is crucial in core-collapse supernova simulations because neutrino transport effect the post-bounce evolution. In this study, we investigate the impact of modified neutrino–matter interactions in GR1D. The standard bremsstrahlung treatment is based on the Burrows et al. non-degenerate formulation, whereas neutron core in the proto-neutron star can become degenerate. We include axial-vector quenching based on Carter and Prakash's result, effective-mass corrections from the equation of state, and Friman–Maxwell bremsstrahlung emissivities for degenerate matter. These rates are combined into a hybrid treatment that applies the Friman–Maxwell results in degenerate region, and the Burrows et al. results in non-degenerate region. The hybrid model reduces the neutrino Luminosity compared with the original non-degenerate data. These results suggest that degeneracy effects and in-medium corrections are important for modeling neutrino Luminosity in core-collapse supernovae.

Speaker: Mr 영소 최

전남대_05.21_최영소.pptx

5 Invited Speakers I - Prospects for RAON Experiments with KISTI-6 Supercomputer

The Rare Isotope Accelerator complex for ON-line experiments (RAON) in Korea is poised to open a new phase in precision nuclear physics, where close interplay among theory, simulation, and experiment is essential. Because nuclear processes occur at femtometer scales and cannot be directly observed, large-scale computational simulations have become an essential component of modern experiments. Large-scale beam simulations using Geant4 as well as ab initio nuclear structure calculations have been successfully carried out using the KISTI-5 supercomputer (Nurion). These studies have enabled predictions of the properties of neutron-deficient isotopes, such as 21Na, which have been experimentally verified at RAON.

The upcoming KISTI-6 supercomputer features a peak performance of approximately 600 PFLOPS and a heterogeneous CPU–GPU architecture, significantly extending the computational frontier. It will enable high-precision nuclear many-body calculations using methods such as the no-core shell model and nuclear lattice effective field theory, allowing simulations of nuclei up to A≈100–200. These advances will improve detector design, rare isotope predictions, and studies of neutron-rich matter, enhancing the role of supercomputing in nuclear physics in the exascale era.

Speaker: Prof. 기현 조

cnpr_raon_cho_052126.pptx

6 Invited Speakers II: Control of physical properties and device applications of colloidal quantum dots

To lead industrial innovation, the development of core nanomaterial technologies is
essential. Colloidal quantum dots (CQDs) are at the forefront of research into next
generation display materials. CQDs are semiconductor materials with sizes smaller than the
exciton Bohr radius, exhibiting quantum confinement effects that result in discrete energy
levels, like artificial atoms. These materials boast high photoluminescence quantum yield,
tunable emission wavelengths, and high color purity. The ability to control these properties
makes CQDs highly adaptable to a variety of applications, including solar cells and other
advanced devices. This study presents systematic approaches to manipulating CQD
properties and applying them to enhance device performance.

Speaker: Prof. 정훈 송

응용물리심포지움 발표자료_송정훈.pdf

7:00 PM Dinner (무등항아리보쌈-보쌈, 홍어삼합 등)

Friday, May 22

Morning session: OMEG II and CPNR II

Convener: 다은 정

7 OMEG 6 - Don’t Diagonalize the Universe: SQD as a Post-VQE Route to Quantum Many-Body Physics

Quantum computing offers a promising route to solving many-body Hamiltonians in quantum chemistry, astrophysical molecular ions, and nuclear physics. However, as the basis set or active space grows, the configuration space increases combinatorially, making full diagonalization impractical. Variational Quantum Eigensolver approaches also face major bottlenecks from Pauli-term measurements, iterative classical optimization, gate depth, and hardware noise. In this talk, I present Sample-based Quantum Diagonalization (SQD) as a compact alternative to deep VQE workflows. Rather than optimizing a full variational ansatz, SQD uses quantum circuits to sample physically important configurations, constructs a reduced subspace, and classically diagonalizes the projected Hamiltonian. Benchmark applications to HeH⁺ and ArH⁺, astrophysically relevant molecular ions, show that SQD can reproduce CCSD-level results within a few mHa in the same basis. I will also discuss how this sampling-and-subspace strategy may provide a natural bridge from molecular electronic structure to nuclear many-body Hamiltonians.

Speaker: Dr 주빈 박

2026_CPNR-OMEG joint workshop @ 전남대.pptx

8 CPNR 2 - Status of JSNS2 and JSNS2-II

JSNS2 (J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source) is a neutrino oscillation experiment with 24m of baseline, targeting Δm² values near 1 eV². To investigate the LSND anomaly directly, the same neutrino source, the same neutrino target, and the same interaction are used. At the J-PARC Material and Life Science Facility, 3 GeV protons produce the neutrino beam via muon decay at rest. These neutrinos interact via inverse beta decay with the neutrino target. The neutrino target is 17tons of Gd-loaded liquid scintillator with 10% of DIN for PSD improvement. In 2021, JSNS2 started the physics run and continued data-taking. In addition, as a second phase of JSNS2, we are commissioning, including the far detector with 48m baselie. The far detector has been completed and is currently being commissioned and performing calibration. Several commissioning activities are in progress, including nitrogen purging of the Gd-loaded liquid scintillator to remove oxygen, installation of a level stabilizer system to maintain a stable liquid scintillator height, and the development of a specific trigger to efficiently identify the physics events. In this presentation, the recent status of JSNS2-II will be shown.

Speaker: Mr 현우 박

CPNR-OMEG JSNS2 and JSNS2-II.pdf

9 CPNR 3 - RENE: Physics Motivation and Status of the RENE Experiment

The Reactor Experiment for Neutrinos and Exotics (RENE) is a short-baseline reactor neutrino experiment aimed at searching for sterile neutrinos through oscillation measurements at a distance of about 23 m from the Hanbit Nuclear Power Plant in Yeonggwang, Korea. The detector features a 0.5% gadolinium-loaded liquid scintillator target surrounded by a liquid scintillator gamma catcher and is equipped with 20-inch photomultiplier tubes for scintillation light detection.

In this presentation, we introduce the physics goals of the RENE experiment, the inverse beta decay detection principle, and the current status of detector development and Monte Carlo simulation.

Speaker: Mr 은규 윤

2026_CPNR-OMEG_EungyuYun.pdf

10 CPNR 4 - Perovskite Nanocrystals:중성미자 검출용 발광·수광 페로브스카이트 양자점 소재 개발

본 연구는 중성미자 검출 과정에서 발생하는 미약한 광신호를 효과적으로 변환·증폭하기 위해

발광 및 수광 기능을 갖는 페로브스카이트 양자점 소재를 개발하는 것을 목표로 한다.

페로브스카이트 양자점은 파장 조절 가능성, 용액공정 기반 박막화 장점을 바탕으로

중성미자 검출용 파장 변환 소재로 활용될 수 있다.

이를 통해 기존 검출 시스템의 광수집 효율과 신호대잡음비를 향상시키고,

차세대 고감도 입자검출 및 광센서 응용 가능성을 제시하고자 한다.

Speaker: Dr 병우 이

12:00 PM Lunch (담양 숫불갈비-불백 또는 쌈밥)

Afternoon session: CPNR III

Convener: 지영 최

11 CPNR 5 - e-mu colliders and discovery of heavy sterile neutrinos.

조만간 미국에서 시도하고자 하는 뮤온충돌기 (muon collider) 를 응용하여 가능한 실험에 대해 연구하였다.
전자-뮤온 충돌실험 (e-mu collider)을 이용하여 표준모형을 넘어서는 전하를 띤 경입자의 맛깔 비보존 변환 과정 (charged Lepton Flavor Violation -cLFV)을 측정함으로서 무거운 불활성 중성미자 (heavy Sterile Neutrino)의 발견에 대한 이론을 설명하고자 한다.

Speaker: Prof. 충선 김

e-mu collider to discover heavy sterile neutrinos.pdf

12 CPNR 6: 2D Ising model sampling using D-Wave quantum annealer

D-Wave uses so-called a quantum annealing process to solve problems of certain categories rather than universal quantum computers do. This research applies D-Wave quantum annealer to find ground state configurations of 2D Ising model. Due to its limitation in the number of qubits, D-Wave is used to update configuration of smaller sized sub-lattice, such as 4 by 4 etc., not of a whole 2D lattice. Results are compared and supplemented with those of a classical MCMC method, Metropolis algorithm. And I will talked about the possibility of D-wave application to particle experiment briefly.

Speaker: Dr 순규 이

sklee_CPNR_OMEG_Joint_20260522.pdf

13 CPNR 7: Water-based Liquid Scintillator R&D effort at Brookhaven National Laboratory

Water-based Liquid Scintillator (WbLS) is an innovative material for constructing large-scale detectors in neutrino and dark matter research. This innovative material features a tunable light yield, facilitated by an inline circulation system, which permits adaptable detector optimization tailored to various physics searches. At Brookhaven National Laboratory (BNL), both 1-ton and 30-ton scale WbLS demonstrators have been constructed and are operational to evaluate the material's stability, optical properties, and overall performance. The 1-ton detector, housed within an acrylic tank and coupled with 2-inch and 3-inch photomultiplier tubes (PMTs), has successfully measured the response of WbLS to cosmic muons and an alpha source. Additionally, the 30-ton detector, featuring Hamamatsu 10-inch PMTs submerged directly in the WbLS, promises further advancements in the technology. In this presentation, the latest experimental status and physics results will be shown.

Speaker: Dr 순우 권

CPNR-OMEG.pdf

14 CPNR 8: Fundamentals of HPGe Detectors: A Metrological Approach to High-Resolution Gamma-Ray Spectroscopy

High-Purity Germanium (HPGe) detectors remain the absolute gold standard for high-resolution gamma-ray spectroscopy across diverse disciplines in experimental physics. Rather than focusing solely on solid-state physics theory, this presentation provides a comprehensive overview of the fundamental metrological principles governing practical HPGe detector operations. We will systematically explore the criteria for selecting specific detector configurations—such as Coaxial, Planar, and Broad Energy types—tailored to target energy ranges, efficiency requirements, and specific experimental geometries. Furthermore, the critical role of thermal management will be discussed, comparing the operational logistics of traditional liquid nitrogen (LN2) cooling with modern electro-mechanical cryocoolers. The discussion will logically extend to the signal processing chain, detailing the integration of preamplifiers, digital pulse processors (DPP), and multi-channel analyzers (MCA) essential for optimizing energy resolution, dead-time correction, and high-throughput count rates. Finally, we will review key accessories and active/passive shielding options designed to mitigate environmental background noise and maximize the signal-to-noise ratio. By bridging the gap between semiconductor properties and empirical instrumentation, this talk aims to equip experimentalists with the robust methodological insights necessary for designing precise, reliable, and optimized radiometric measurement systems.

Speaker: Dr 상용 김

2026CPNR_OMEG_HPGe_sykim.pdf

(주)네오시스코리아-GENIE2K [HPGe Gamma System] 운영교육자료(2024).pdf

Coffee break & Photo

Afternoon session: OMEG III and CPNR IV

Convener: Kyung Kwang Joo

15 OMEG 4 - Multipole-Resolved Nuclear Transition Strengths of 12C Induced by Mono-Energetic KDAR Neutrinos

This study investigates charged-current (CC) neutrino-induced reactions on $^{12}\text{C}$ using mono-energetic neutrinos ($E_\nu = 236$ MeV) from kaon decay at rest (KDAR). We performed a detailed decomposition of nuclear transition strengths into spin-parity states, longitudinal and transverse components, and vector and axial-vector contributions. Our results demonstrate that KDAR neutrinos serve as a powerful tool for probing multipole-dependent nuclear structures that are otherwise difficult to isolate in conventional flux-averaged measurements.

Speaker: Mr 채윤 이

260522_PPT_CYLee_v5.pdf

16 OMEG 5 - Production of strange and charmed vector mesons in meson-induced reactions

We investigate the reaction mechanisms of the strangeness-production processes K- p -> ϕY and π-p -> KY within a hybrid Regge framework, including the t-channel K- and K-Reggeon exchanges. We present results for the total cross sections, t-dependent differential cross sections, and
spin-density matrix elements (SDMEs), and compare them with the available experimental data. To obtain reliable predictions for the corresponding charm counterparts, we employ a Quark-Gluon String Model (QGSM)-motivated Regge prescription.

Speaker: Dr 상호 김

26.05.22_JointWS_KimSH_v2.pdf

17 Invited Speakers III - JSNS2/-II

The JSNS2 (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) experiment and its upcoming Phase-II upgrade present a compelling frontier in neutrino physics, uniquely positioned to test the eV-scale sterile neutrino anomaly. Rather than relying solely on theoretical phenomenology, this presentation focuses on the experimental mechanics and the unique beam characteristics that make JSNS2 highly competitive. We will systematically explore the J-PARC Materials and Life Science Experimental Facility (MLF) as an exceptionally intense source of Decay-At-Rest (DAR) neutrinos.A primary focus will be placed on exploiting the $\mu^+$ Decay-At-Rest (muDAR) spectrum for the $\bar{\nu}_\mu \to \bar{\nu}_e$ appearance search, leveraging the well-understood energy distribution to meticulously control systematic uncertainties. Furthermore, we will highlight the critical role of Kaon Decay-At-Rest (KDAR). Producing monochromatic 236 MeV $\nu_\mu$, KDAR serves as a rare and invaluable "standard candle" in neutrino physics. We will discuss its application in precision neutrino-nucleus cross-section measurements, energy calibration, and probing exotic dark sector physics.From a metrological standpoint, the talk will also address the detector instrumentation, specifically the deployment of Gadolinium-loaded Liquid Scintillator (Gd-LS) targets. We will examine the operational strategies for maximizing the signal-to-noise ratio in a high-background accelerator environment using prompt-delayed coincidence logic. Finally, the presentation will outline the strategic enhancements of JSNS2-II, emphasizing how the addition of a far detector will break parameter degeneracies and definitively establish the existence or exclusion of the sterile neutrino within the targeted parameter space.

Speaker: Prof. 명렬 박

JSNS2_KDAR_CNU.pptx

Today's closing remarks

Convener: Myung-Ki Cheoun (Soongsil Univ)

6:20 PM Dinner (다현정식-보리굴비, 간장게장)

Saturday, May 23

Self-organized Research Group Discussions

12:00 PM Lunch

Self-organized Research Group Discussions II and Excursion (to Mudeungsan National Park)