Kyong Chol Han
A5035662901- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Atomic and Molecular Physics
- Laser-Matter Interactions and Applications
- Astrophysics and Cosmic Phenomena
- Laser-Plasma Interactions and Diagnostics
- Solar and Space Plasma Dynamics
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Laser-induced spectroscopy and plasma
- Gamma-ray bursts and supernovae
- Radiation Therapy and Dosimetry
- VLSI and Analog Circuit Testing
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Engineering and Test Systems
- Crystallography and Radiation Phenomena
- Superconducting Materials and Applications
- Diamond and Carbon-based Materials Research
- Cold Atom Physics and Bose-Einstein Condensates
- Geomagnetism and Paleomagnetism Studies
National Chung Shan Institute of Science and Technology
2016-2024
Texas A&M University
2002-2021
Mitchell Institute
2016
University of Maryland, College Park
2011
IceCube has become the first neutrino telescope with a sensitivity below TeV flux predicted from gamma-ray bursts if are responsible for observed cosmic-ray above 10(18) eV. Two separate analyses using half-complete detector, one dedicated search neutrinos pγ interactions in prompt phase of burst fireball and other generic any emission these sources over wide range energies times, produced no evidence emission, excluding prevailing models at 90% confidence.
We present the precision measurement of daily proton fluxes in cosmic rays from May 20, 2011 to October 29, 2019 (a total 2824 days or 114 Bartels rotations) rigidity interval 1 100 GV based on 5.5×10^{9} protons collected with Alpha Magnetic Spectrometer aboard International Space Station. The exhibit variations multiple timescales. From 2014 2018, we observed recurrent flux a period 27 days. Shorter periods 9 and 13.5 are 2016. strength all three periodicities changes time rigidity....
Precision measurements by the Alpha Magnetic Spectrometer (AMS) on International Space Station of ^{3}He and ^{4}He fluxes are presented. The based 100 million nuclei in rigidity range from 2.1 to 21 GV 18 1.9 15 collected May 2011 November 2017. We observed that exhibit nearly identical variations with time. relative magnitude decreases increasing rigidity. dependence ^{3}He/^{4}He flux ratio is measured for first Below 4 GV, was found have a significant long-term time dependence. Above be...
We present the precision measurements of 11 years daily cosmic electron fluxes in rigidity interval from 1.00 to 41.9 GV based on 2.0×10^{8} electrons collected with Alpha Magnetic Spectrometer (AMS) aboard International Space Station. The exhibit variations multiple timescales. Recurrent flux periods 27 days, 13.5 and 9 days are observed. find that show distinctly different time proton fluxes. Remarkably, a hysteresis between is observed significance greater than 6σ at rigidities below 8.5...
Precision measurements by the Alpha Magnetic Spectrometer (AMS) on International Space Station of deuteron (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>D</a:mi></a:mrow></a:math>) flux are presented. The based <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mn>21</c:mn><c:mo>×</c:mo><c:msup><c:mrow><c:mn>10</c:mn></c:mrow><c:mrow><c:mn>6</c:mn></c:mrow></c:msup></c:mrow></c:math> <e:math...
We propose to model hadronization of parton showers in QCD jets through a hybrid approach involving quark recombination and string fragmentation. This is achieved by allowing gluons at the end perturbative shower evolution undergo non-perturbative splitting into antiquark pairs, then applying Monte-Carlo version instantaneous recombination, finally subjecting remnant quarks (those which have not found partner) Lund When applied from PYTHIA Monte Carlo event generator, final hadron spectra...
We report the properties of primary cosmic-ray sulfur (S) in rigidity range 2.15 GV to 3.0 TV based on 0.38×10^{6} nuclei collected by Alpha Magnetic Spectrometer experiment (AMS). observed that above 90 dependence S flux is identical Ne-Mg-Si fluxes, which different from He-C-O-Fe fluxes. found that, similar N, Na, and Al cosmic rays, over entire range, traditional rays S, Ne, Mg, C all have sizeable secondary components, Mg fluxes are well described weighted sum silicon fluorine flux,...
Using the two-component model that includes both initial production from nucleon-nucleon hard scattering and regeneration produced quark-gluon plasma, we study effect of medium modifications binding energies radii bottomonia on their in heavy-ion collisions. We find contribution to is small inclusion effects helpful for understanding observed suppression experiments carried out at BNL Relativistic Heavy Ion Collider CERN Large Hadron Collider.
Using the two-component model that includes charmonium production from both initial nucleon-nucleon hard scattering and regeneration in produced quark-gluon plasma, we study $J/\ensuremath{\psi}$ heavy-ion collisions at Super Proton Synchrotron (SPS), Relativistic Heavy Ion Collider (RHIC), Large Hadron (LHC). For expansion dynamics of hot dense matter, use a schematic viscous hydrodynamic with specific shear viscosity plasma hadronic matter taken, respectively, to be two ten times lower...
High-harmonic generation (HHG) of laser radiation has led to attosecond pulse formation which offers unprecedented temporal resolution in observing and controlling electron nuclear dynamics. But the energy pulses remains quite small, especially for photon energies exceeding 100 eV, limits their practical applications. We propose a method amplification active medium plasma-based x-ray dressed by replica field used HHG. The experimental implementation is suggested hydrogenlike C5+ at 3.4 nm...
Parameterizing the charm and anticharm quark momentum distributions by Tsallis distribution, we study nonequilibrium effect on charmonium production rate in a quark-gluon plasma up to next-to-leading order perturbative QCD. We find that quarks suppress compared from equilibrated ones. further show suppression factor calculated with relaxation time, which has frequently been used literature, is close our results.
Assuming that in the hot dense matter produced relativistic heavy-ion collisions, energy density, entropy and pressure as well azimuthal space-time rapidity components of shear tensor are uniform direction transversal to reaction plane, we derive a set schematic equations from Isreal-Stewart causal viscous hydrodynamics. These then used describe evolution dynamics collisions by taking viscosity density ratio $1/4\ensuremath{\pi}$ for initial quark-gluon plasma (QGP) phase 10 times this value...
Received 23 September 2011DOI:https://doi.org/10.1103/PhysRevC.84.039902©2011 American Physical Society
We study hadron production in jets by applying quark recombination to jet shower partons. With the showers obtained from PYTHIA and augmented additional non-perturbative effects, we compute spectra e+ + e-collisions at sqrt(s)=200 GeV. Including contributions resonance decays, find that resulting transverse momentum for pions, kaons, protons reproduce reasonably those string fragmentation as implemented PYTHIA.
Using the screened Cornell potential and next-to-leading order perturbative QCD to determine, respectively, properties of bottomonia their dissociation cross sections in a quark-gluon plasma, we study 2+1 ideal hydrodynamics effect initial fluctuations on production relativistic heavy-ion collisions. We find that while hardly affect yield 1S ground state bottomonium, excited bottomonium states is not small. Compared case with smooth conditions, survival probability reduced at low transverse...
Using the two-component model that includes both initial production from nucleon-nucleon hard scattering and regeneration produced quark-gluon plasma (QGP), we have studied effect of medium modifications binding energies radii quarkonia on their in heavy-ion collisions. We find inclusion effects is helpful for understanding observed suppression experiments carried out at SPS, RHIC, LHC.
Using the screened Cornell potential and next-to-leading order perturbative QCD to determine, respectively, properties of bottomonia their dissociation cross sections in a quark-gluon plasma, we have studied 2+1 ideal hydrodynamics effect initial fluctuations on production relativistic heavy-ion collisions. We found that while hardly affect yield 1S ground state bottomonium, excited bottomonium states is not small. Compared case with smooth conditions, survival probabilities are reduced at...
In the present contribution we discuss a possibility to amplify train of attosecond x-ray pulses produced via HHG an optical laser fieldin active medium plasma-based dressed by replica field used for generation harmonics. particular, amplification two orders magnitude in "water window" is shown.