A5016048500- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Cosmology and Gravitation Theories
- Stochastic processes and statistical mechanics
- Advanced Data Compression Techniques
Brookhaven National Laboratory
2016-2025
Nanning Normal University
2025
Los Alamos National Laboratory
2012-2024
University of California, Davis
2020-2024
Augustana University
2016-2024
Banaras Hindu University
2016-2024
Bhabha Atomic Research Centre
2017-2024
Affiliated Hospital of Nantong University
2024
Nantong University
2024
Second Affiliated Hospital of Nantong University
2024
We describe in detail the instrumentation and calibrations used Atmospheric Lifetime Experiment (ALE), Global Gases (GAGE), Advanced (AGAGE) present a history of majority anthropogenic ozone‐depleting climate‐forcing gases air based on these experiments. Beginning 1978, three successive automated high‐frequency situ experiments have documented long‐term behavior measured concentrations over past 20 years, show both evolution latitudinal gradients variability due to sources circulation....
Determination of the atmospheric concentrations and lifetime trichloroethane (CH(3)CCI(3)) is very important in context global change. This halocarbon involved depletion ozone, hydroxyl radical (OH) determined from its provide estimates lifetimes most other hydrogen-containing gases ozone layer climate. Global measurements indicate rising before declining after late 1991. The CH(3)CCI(3) total atmosphere 4.8 +/- 0.3 years, which substantially lower than previously estimated. deduced...
The hydroxyl radical (OH) is the dominant oxidizing chemical in atmosphere. It destroys most air pollutants and many gases involved ozone depletion greenhouse effect. Global measurements of 1,1,1-trichloroethane (CH 3 CCl , methyl chloroform) provide an accurate method for determining global hemispheric behavior OH. Measurements show that CH levels rose steadily from 1978 to reach a maximum 1992 then decreased rapidly 2000 were lower than when began 1978. Analysis these observations shows OH...
Following almost a decade with little change in global atmospheric methane mole fraction, we present measurements from the Advanced Global Atmospheric Gases Experiment (AGAGE) and Australian Commonwealth Scientific Industrial Research Organisation (CSIRO) networks that show renewed growth starting near beginning of 2007. Remarkably, similar rate is found at all monitoring locations this time until latest measurements. We use these data, along an inverse method applied to simple model...
We report the first measurement of parity-violating asymmetry APV in elastic scattering polarized electrons from Pb208. is sensitive to radius neutron distribution (Rn). The result APV=0.656±0.060(stat)±0.014(syst) ppm corresponds a difference between radii and proton distributions Rn−Rp=0.33−0.18+0.16 fm provides electroweak observation skin which expected heavy, neutron-rich nucleus.Received 12 January 2012DOI:https://doi.org/10.1103/PhysRevLett.108.112502© 2012 American Physical Society
We present a search at the Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling ${\ensuremath{\alpha}}^{\ensuremath{'}}$ to electrons. Such particle ${A}^{\ensuremath{'}}$ can be produced in electron-nucleus fixed-target scattering and then decay an ${e}^{+}{e}^{\ensuremath{-}}$ pair, producing narrow resonance QED trident spectrum. Using APEX test run data, we searched mass range 175--250 MeV, found no evidence...
Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing strong interaction dynamics nucleon's quark constituents; indeed, recent proton data have attracted intense theoretical interest. In this Letter, we report new measurements factor ratio using recoil polarization method, at momentum transfers Q2=5.2, 6.7, and 8.5 GeV2. By extending range Q2 which G(E)(p) is accurately determined by more than 50%,...
The hydroxyl free radical (OH) is the major oxidizing chemical in atmosphere, destroying about 3.7 petagrams (Pg) of trace gases each year, including many involved ozone depletion, greenhouse effect and urban air pollution. Measurements 1,1,1‐trichloroethane (methyl chloroform, CH 3 CCl ), which reacts with OH, provide most accurate method currently utilized for determining global behavior OH. We report that levels rose steadily from 1978 to reach a maximum 1992 have since decreased rapidly...
Ground‐based in situ measurements of 1,1‐difluoroethane (HFC‐152a, CH 3 CHF 2 ) which is regulated under the Kyoto Protocol are reported auspices AGAGE (Advanced Global Atmospheric Gases Experiment) and SOGE (System Observation halogenated Greenhouse gases Europe) programs. Observations HFC‐152a at five locations (four European one Australian) over a 10 year period were recorded. The annual average growth rate midlatitude Northern Hemisphere has risen from 0.11 ppt/yr to 0.6 1994 2004....
We report the first measurement of target single spin asymmetries in semi-inclusive $^3{He}(e,e'\pi^\pm)X$ reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using 5.9 GeV electron beam, covers range 0.14 $< x <$ 0.34 with 1.3 $<Q^2<$ 2.7 GeV$^2$. Collins and Sivers moments were extracted from azimuthal angular dependence measured asymmetries. $\pi^\pm$ for $^3$He are consistent zero, except $\pi^+$ moment $x=0.34$, which deviates zero by 2.3$\sigma$....
We report a new, high-precision measurement of the proton elastic form factor ratio μpGE/GM for four-momentum transfer squared Q2=0.3–0.7(GeV/c)2. The was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With total uncertainty approximately 1%, new data clearly show that deviation from unity observed previous polarization measurements high Q2 continues down to lowest value this measurement. updated global fit includes results yields an electric (magnetic) roughly 2%...
An update of in situ Advanced Global Atmospheric Gases Experiment (AGAGE) hydrofluorocarbon (HFC)/hydrochlorofluorocarbon (HCFC) measurements made at Mace Head, Ireland, and Cape Grim, Tasmania, from 1998 to 2002 are reported. HCFC‐142b, HCFC‐141b, HCFC‐22 HFC‐134a show continued rapid growth the atmosphere mean rates 1.1, 1.6, 6.0, 3.4 ppt/year, respectively. Emissions inferred compared recent estimates consumption data. Minor updates industry emissions reported together with a discussion...
To determine the prevalence of unsuspected pulmonary embolism (PE) on routine thoracic helical computed tomographic (CT) scans and to quantify improvement in PE detection by using a cine-paging mode workstation instead hard-copy review.Seven hundred eighty-five patients referred for contrast medium-enhanced CT within 9 months were prospectively recruited. Helical was performed. Studies interpreted four radiologists. Two radiologists performed routine, undirected, consensus review official...
Nitrous oxide (N 2 O) is an important ozone‐depleting gas and greenhouse with multiple uncertain emission processes. Global nitrous observations, the Model of Atmospheric Transport Chemistry (MATCH) inverse method were used to optimally estimate N O emissions from twelve source regions around globe. MATCH was forecast center reanalysis winds at T62 resolution (192 longitude by 94 latitude surface grid, 28 vertical levels) 1 July 1996 30 June 2006. The average concentrations in lowest four...
National emission inventories of ozone‐depleting substances (ODS) play a key role in the control mechanisms Montreal Protocol's reduction plans. New quasi‐continuous ground‐based atmospheric measurements allow us to estimate China's current emissions most effective ODS. This serves as an independent validation ODS consumption data reported United Nations Environment Programme (UNEP). Emissions first‐generation have declined recent years, suggesting compliance with regulations advanced...
The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624 GeV and beam energy E =3.48 to be A_PV -23.80 +/- 0.78 (stat) 0.36 (syst) parts per million. This result is consistent with zero contribution strange quarks combination electric magnetic form factors G_E^s + 0.517 G_M^s 0.003 0.010 0.004 0.009 (ff), where third error due limits precision on electromagnetic...
Intensive theoretical and experimental efforts over the past decade have aimed at explaining discrepancy between data for proton electric to magnetic form factor ratio, G(E)/G(M), obtained separately from cross section polarization transfer measurements. One possible explanation this difference is a two-photon-exchange contribution. In an effort search effects beyond one-photon-exchange or Born approximation, we report measurements of observables in elastic H(e[over →],e(')p[over →])...
The GEp-III and GEp-2$\gamma$ experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of $G_E^p/G_M^p$ highest practically achievable $Q^2$ search for effects beyond Born approximation polarization transfer observables elastic $\vec{e}p$ scattering. This article reports an expanded description common experimental apparatus data analysis procedure, results a final reanalysis both experiments, including previously unpublished full-acceptance...
The High Energy cosmic-Radiation Detection (HERD) facility is one of several space astronomy payloads the cosmic lighthouse program onboard China's Space Station, which planned for operation starting around 2020 about 10 years. main scientific objectives HERD are indirect dark matter search, precise ray spectrum and composition measurements up to knee energy, high energy gamma-ray monitoring survey. composed a 3-D cubic calorimeter (CALO) surrounded by microstrip silicon trackers (STKs) from...
Recently, multiparticle-correlation measurements of relativistic $p/d/^{3}\mathrm{He}+\mathrm{Au}$, $p+\mathrm{Pb}$, and even $p+p$ collisions show surprising collective signatures. Here, we present beam-energy-scan two-, four-, six-particle angular correlations in $d+\mathrm{Au}$ at $\sqrt{{s}_{NN}}=200$, 62.4, 39, 19.6 GeV. We also two- four-particle $p+\mathrm{Au}$ $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. find the cumulant to be real valued for all four energies. that has...
Colorimetric gas sensors show promise as selective detectors for chromatography (GC), but their application has been limited by the irreversibility of responses. This study presents successful hyphenation colorimetric with GC, overcoming this limitation through a novel approach that refreshes sensor's reaction area controlled movement, enabling generation reversible GC peaks. The sensors, based on acid-base indicators, such chlorophenol red and bromocresol green, were integrated capillary...