C. C. H. Jui
A5047415012- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Lightning and Electromagnetic Phenomena
- CCD and CMOS Imaging Sensors
- Photocathodes and Microchannel Plates
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Computational Physics and Python Applications
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Radiation Detection and Scintillator Technologies
- Precipitation Measurement and Analysis
- Scientific Research and Discoveries
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Muon and positron interactions and applications
- Infrared Target Detection Methodologies
University of Utah
2014-2024
Rutgers, The State University of New Jersey
2010
The University of Adelaide
2007
Stanford University
1987-2002
University of California, Riverside
1992-1995
University of Manchester
1994
Indiana University Bloomington
1993
University of Oregon
1993
University of Victoria
1993
University of Freiburg
1993
The High Resolution Fly's Eye (HiRes) experiment has observed the Greisen-Zatsepin-Kuzmin suppression (called GZK cutoff) with a statistical significance of five standard deviations. HiRes' measurement flux ultrahigh energy (UHE) cosmic rays shows sharp at an $6 \times 10^{19}$ eV, consistent expected cutoff energy. We observe ``ankle'' cosmic-ray spectrum as well, $4 10^{18}$ eV. describe experiment, data collection, analysis, and estimate systematic uncertainties. results are presented...
An experiment has been performed to search for the muon- and electron-number nonconserving decay μ+→e+γ. The upper limit branching ratio is found be Γ(μ+→e+γ)/ Γ(μ+→e+ν¯ν)<1.2×10−11 with 90% confidence.Received 10 May 1999DOI:https://doi.org/10.1103/PhysRevLett.83.1521©1999 American Physical Society
The Telescope Array (TA) experiment, located in the western desert of Utah,USA, is designed for observation extensive air showers from extremely high energy cosmic rays. experiment has a surface detector array surrounded by three fluorescence detectors to enable simultaneous detection shower particles at ground level and photons along track. TA started full hybrid March, 2008. In this article we describe design technical features detector.
We have searched for intermediate-scale anisotropy in the arrival directions of ultrahigh-energy cosmic rays with energies above 57~EeV northern sky using data collected over a 5 year period by surface detector Telescope Array experiment. report on cluster events that we call hotspot, found oversampling 20$^\circ$-radius circles. The hotspot has Li-Ma statistical significance 5.1$\sigma$, and is centered at R.A.=146.7$^{\circ}$, Dec.=43.2$^{\circ}$. position about 19$^{\circ}$ off...
The Telescope Array (TA) collaboration has measured the energy spectrum of ultra-high cosmic rays with primary energies above 1.6 x 10^(18) eV. This measurement is based upon four years observation by surface detector component TA. shows a dip at an 4.6 eV and steepening 5.4 10^(19) which consistent expectation from GZK cutoff. We present results technique, new to analysis ray data, that involves generating complete simulation striking TA detector. procedure starts shower simulations using...
We have measured the cosmic ray spectrum above 10(17.2) eV using two air-fluorescence detectors of High Resolution Fly's Eye observatory operating in monocular mode. describe detector, phototube, and atmospheric calibrations, as well analysis techniques for detectors. fit to a model consisting galactic extragalactic sources.
The composition of Ultra High Energy Cosmic Rays (UHECR) is measured with the Resolution Fly's Eye cosmic ray observatory (HiRes) data using Xmax technique. Data were collected in stereo between 1999 November and 2001 September. are reconstructed well-determined geometry. Measurements atmospheric transmission incorporated reconstruction. detector resolution found to be 30 g cm^-2 13% Energy. elongation rate 10^18.0 eV 10^19.4 54.5 +/- 6.5 (stat) 4.5 (sys) per decade. This compared...
The Telescope Array observatory utilizes fluorescence detectors and surface to observe air showers produced by ultra high energy cosmic rays in the Earth's atmosphere. Cosmic ray events observed this way are termed hybrid data. depth of shower maximum is related mass primary particle that generates shower. This paper reports on maxima data collected over 8.5 years using Black Rock Mesa Long Ridge conjunction with array detectors. We compare means standard deviations $X_{\mathrm{max}}$...
We report on a measurement of the cosmic ray energy spectrum by Telescope Array Low-Energy Extension (TALE) air fluorescence detector. The TALE detector is also sensitive to Cherenkov light produced shower particles. Low rays, in PeV range, are detectable as "Cherenkov Events". Using these events, we measure from low $\sim 2$ an greater than 100 PeV. Above can detect rays using fluorescence. This allows for extension energies few EeV. In this paper, will describe detector, explain technique,...
We study the spectrum and average mass composition of cosmic rays with primary energies between 10^{17} eV 10^{18} using a hybrid detector consisting High Resolution Fly's Eye (HiRes) prototype MIA muon array. Measurements have been made change in depth shower maximum as function energy. A complete Monte Carlo simulation response comparisons simulations leads to conclusion that ray intensity is changing f rom heavier lighter this energy range. The consistent earlier measurements supports...
The average mass composition of cosmic rays with primary energies between ${10}^{17}$ and ${10}^{18}\mathrm{eV}$ has been studied using a hybrid detector consisting the High Resolution Fly's Eye (HiRes) prototype MIA muon array. Measurements have made change in depth shower maximum density as function energy. results show that is changing from heavy to lighter mix energy increases.
Abstract Bursts of gamma ray showers have been observed in coincidence with downward propagating negative leaders lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700‐km 2 cosmic observatory located southwestern Utah, USA. In data collected between 2014 and 2016, correlated observations showing structure temporal development three shower‐producing were obtained 3‐D mapping array, electric field change measurements for an additional seven flashes, both cases...
One of the uncertainties in interpretation ultrahigh energy cosmic ray data comes from hadronic interaction models used for air shower Monte Carlo (MC) simulations. The number muons observed at ground ray--induced showers is expected to depend upon model. may therefore test by comparing measured with MC prediction. In this paper, we present results studies muon densities extensive obtained analyzing signal surface detector stations which should have high purity. purity a station will on both...
In this paper we report the first close, high-resolution observations of downward-directed terrestrial gamma-ray flashes (TGFs) detected by large-area Telescope Array cosmic ray observatory, obtained in conjunction with broadband VHF interferometer and fast electric field change measurements parent discharge. The results show that TGFs occur during strong initial breakdown pulses (IBPs) few milliseconds negative cloud-to-ground low-altitude intracloud flashes, IBPs are produced a...
We study the anisotropy of Ultra-High Energy Cosmic Ray (UHECR) events collected by Telescope Array (TA) detector in first 40 months operation. Following earlier studies, we examine event sets with energy thresholds 10 EeV, and 57 EeV. find that distributions right ascension declination are compatible an isotropic distribution all three sets. then compare previously reported clustering UHECR at small angular scales. No significant is found TA data. check E>57 EeV for correlations nearby...