A5010001093- Nuclear physics research studies
- Muon and positron interactions and applications
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Plasma Diagnostics and Applications
- Spectroscopy and Quantum Chemical Studies
- Molecular spectroscopy and chirality
- Neutrino Physics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Surface Chemistry and Catalysis
- RNA and protein synthesis mechanisms
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Astrophysical Phenomena and Observations
- Supramolecular Chemistry and Complexes
- Chemical Synthesis and Analysis
- Superconducting Materials and Applications
- Quantum Chromodynamics and Particle Interactions
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
Seoul National University
2017-2025
Institute for Basic Science
2022-2023
University of Tennessee at Knoxville
2019
This paper introduces a new approach to measure the muon magnetic moment anomaly |$a_{\mu} = (g-2)/2$| and electric dipole (EDM) |$d_{\mu}$| at J-PARC facility. The goal of our experiment is |$a_{\mu}$| using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing |$g-2$| experiments unprecedented quality storage field. Additional significant differences from present experimental include 1000 transverse emittance beam...
The homochirality of life remains an unresolved scientific question. Prevailing models postulate that arose through mutual antagonism. In this mechanism, molecules opposite handedness deactivate each other, amplifying even a small enantiomeric excess into larger proportion. paper, we present chiral molecular clips replicate process. Through π-π stacking and complementary hydrogen bonds, shape-persistent chirality bind to other more strongly than those the same chirality, resulting in...
Observed abundances of Z ~ 40 elements in metal-poor stars vary from star to star, indicating that the rapid and slow neutron capture processes may not contribute alone synthesis beyond iron. The weak r-process was proposed produce a subset old stars. Thought occur {\nu}-driven ejecta core-collapse supernova, ({\alpha}, xn) reactions would drive nuclear flow toward heavier masses at T = 2-5 GK. However, current comparisons between modelled observed yields do bring satisfactory insights into...
Theoretical models of β-delayed neutron emission are used as crucial inputs in r-process calculations. Benchmarking the predictions these is a challenge due to lack currently available experimental data. In this work probabilities 33 nuclides important mass regions south and south-west 132Sn presented, 16 for first time. The measurements were performed at RIKEN using Advanced Implantation Detector Array (AIDA) BRIKEN detector array. P1n values presented constrain theoretical region,...
We propose to measure the photo-production cross section of $J/{\psi}$ near threshold, in search recently observed LHCb hidden-charm resonances $P_c$(4380) and $P_c$(4450) consistent with 'pentaquarks'. The observation these will provide strong evidence true resonance nature states, distinguishing them from kinematic enhancements. A bremsstrahlung photon beam produced an 11 GeV electron at CEBAF covers energy range production threshold 8.2 GeV, beyond presumed resonance. experiment be...
The $\ensuremath{\beta}$-delayed one- and two-neutron emission probabilities (${P}_{1n}$ ${P}_{2n}$) of 20 neutron-rich nuclei with $N\ensuremath{\ge}82$ have been measured at the RIBF facility RIKEN Nishina Center. ${P}_{1n}$ $^{130,131}\mathrm{Ag}$, $^{133,134}\mathrm{Cd}$, $^{135,136}\mathrm{In}$, $^{138,139}\mathrm{Sn}$ were determined for first time, stringent upper limits placed on ${P}_{2n}$ nearly all cases. ($\ensuremath{\beta}2n$) was unambiguously identified in $^{133}\mathrm{Cd}$...
An ambitious program to measure decay properties, primarily β-delayed neutron emission probabilities and half-lives, for a significant number of nuclei near or on the path rapid capture process, has been launched at RIKEN Nishina Center.We give here an overview status project.
$\ensuremath{\beta}$-delayed one-neutron and two-neutron branching ratios $({P}_{1n}$ ${P}_{2n})$ have been measured in the decay of $A=84$ to 87 Ga isotopes at Radioactive-Isotope Beam Factory (RIBF) RIKEN Nishina Center using a high-efficiency array $^{3}\mathrm{He}$ neutron counters (BRIKEN). Two-neutron emission was observed $^{84,85,87}\mathrm{Ga}$ for first time were be ${P}_{2n}=1.6(2)%,1.3(2)%$, $10.2{(28)}_{\mathrm{stat}}{(5)}_{\mathrm{sys}}%$, respectively. One-neutron ratio...
Muons have been accelerated by using a radio-frequency accelerator for the first time. Negative muonium atoms (${\mathrm{Mu}}^{\ensuremath{-}}$), which are bound states of positive muons (${\ensuremath{\mu}}^{+}$) and two electrons, generated from ${\ensuremath{\mu}}^{+}$'s through electron capture process in an aluminum degrader. The ${\mathrm{Mu}}^{\ensuremath{-}}$'s initially electrostatically injected into quadrupole linac (RFQ). In RFQ, to 89 keV. identified momentum measurement time...
Muon acceleration is an important technique in exploring the new frontier of physics. A measurement muon dipole moments planned J-PARC using linear accelerator. The low-energy (LE) source thin metal foil target and beam diagnostic system were developed for world's first acceleration. Negative muonium ions from as LE was successfully observed. Also profile positive measured by LE-dedicated monitor. test a Radio-Frequency Quadrupole linac (RFQ) being prepared step accelerator development. In...
Isomeric states in 59,61Ti have been populated the projectile fragmentation of a 345 AMeV 238U beam at Radioactive Isotope Beam Factory. The decay lifetimes and delayed gamma-ray transitions were measured with EURICA array. Besides known isomeric state 59Ti, two 61Ti are observed for first time. Based on lifetimes, transition multipolarities as well tentative spins parities assigned. Large-scale shell model calculations based modified LNPS interaction show that both 59Ti belong to Island...
This paper introduces a new approach to measure the muon magnetic moment anomaly $a_{\mu} = (g-2)/2$, and electric dipole (EDM) $d_{\mu}$ at J-PARC facility. The goal of our experiment is $a_{\mu}$ using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing $g-2$ experiments unprecedented quality storage field. Additional significant differences from present experimental include 1,000 transverse emittance beam (reaccelerated...
Drawing inspiration from allosteric proteins, a zigzag-shaped π-conjugation was structurally engineered into tweezer-like ionophore having multiple disparate binding sites. When soft metal ion binds to the central tridentate ligand motif, rigid backbone folds, bringing two macrocyclic arms close proximity. Stabilized by coordinating anion, conformation of resulting metalloligand recruits hard cation form sandwich-like complex with remarkably enhanced affinity and selectivity.
The muon g−2/EDM experiment at J-PARC aims to measure the anomalous magnetic moment and electric dipole with high precision by utilising an ultracold beam. current g−2 discrepancy between Standard Model prediction experimental value is about 3.5 standard deviations. This requires a development of LINAC accelerate thermal muons 300 MeV/c momentum. Detectors for beam diagnostics play key role in such experiment. profile monitoring system has been designed low energy It was tested during two...
β-delayed γ-neutron spectroscopy has been performed on the decay of A=84 to 87 gallium isotopes at RI-beam Factory RIKEN Nishina Center using a high-efficiency array 3He neutron counters (BRIKEN). β−2n−γ events were measured in decays all four for first time, which is direct evidence populating excited states two-neutron daughter nuclei. Detailed schemes with γ branching ratios obtained these isotopes, and emission probabilities (Pxn) updated from previous study. Hauser-Feshbach statistical...
Neutron-rich nuclei in the vicinity of $N=40$ island inversion are characterized by shell evolution and exhibit deformed ground states. In several isomeric states have been observed attributed to excitations intruder neutron $1g_{9/2}$ orbital. present study we searched for around $N=40$, $Z=22$ produced projectile fragmentation at RIBF. Delayed $\gamma$ rays were detected EURICA germanium detector array. High statistics data allowed an updated decay scheme $^{60}$V. The lifetime state...
The commissioning of a new setup for β-delayed neutron measurements was carried out successfully in November-2016, at the RIKEN Nishina Center Japan. β-decay half-lives and Pn branching ratios several isotopes 78Ni region were measured. Details experimental first results are given.
A negative muonium ion (${\mathrm{Mu}}^{\ensuremath{-}}$) source using an aluminum foil target (Al target) was developed as a low-energy muon source. ${\mathrm{Mu}}^{\ensuremath{-}}$ ions are produced by irradiating the Al with 3-MeV positive (${\ensuremath{\mu}}^{+}$) beam and observed microchannel plate. An experiment to produce conducted evaluate performance of this The measured event rate $(1.7\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\text{...
The α resonant scattering on 18 Ne was measured in inverse kinematics to understand the -clustering of proton-rich 22 Mg nucleus, performed at CNS Radio-Isotope Beam Separator (CRIB) Center for Nuclear Study, University Tokyo, located RIBF RIKEN Nishina Center. excitation function obtained energies 10–16 MeV by adopting thick-target method. Several resonances were evident present work, which implies existence energy levels with large widths. Since not clearly observed astrophysically...