K. S. Nelson
A5019968717- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Astro and Planetary Science
- Particle Accelerators and Free-Electron Lasers
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Blood Pressure and Hypertension Studies
- Atomic and Subatomic Physics Research
- Planetary Science and Exploration
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Social Policy and Reform Studies
- Nuclear physics research studies
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Healthcare innovation and challenges
- Advanced Data Storage Technologies
- Social and Educational Sciences
- Earthquake Detection and Analysis
- Muon and positron interactions and applications
Johns Hopkins University Applied Physics Laboratory
2011-2024
University of Virginia
2002-2014
Johns Hopkins University
2013-2014
AIMST University
2012
Brookhaven National Laboratory
2011
Iowa State University
1992-2003
University of Wisconsin–Madison
1988-2002
University of Arizona
2000-2002
Lubrizol Life Science Health (United States)
2001
Fermi National Accelerator Laboratory
1993-1999
The Integrated Science Investigation of the Sun (ISIS) is a complete science investigation on Solar Probe Plus (SPP) mission, which flies to within nine solar radii Sun’s surface. ISIS comprises two-instrument suite measure energetic particles over very broad energy range, as well coordinated management, operations, data processing, and scientific analysis. Together, observations allow us explore mechanisms dynamics, including their: (1) Origins—defining seed populations physical conditions...
After decades of observations solar energetic particles from space-based observatories, relevant questions on particle injection, transport, and acceleration remain open. To address these scientific topics, accurate measurements the properties in inner heliosphere are needed. In this paper we describe Energetic Particle Detector (EPD), an instrument suite that is part payload aboard Solar Orbiter mission. will approach Sun as close 0.28 au provide extra-ecliptic beyond ∼30° heliographic...
We have compared the decay rates of ${K}_{L}$ and ${K}_{S}$ to ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ final states using a subset data from KTeV experiment (E832) at Fermilab. find that direct-CP-violation parameter $\mathrm{Re}({\ensuremath{\epsilon}}^{\ensuremath{'}}/\ensuremath{\epsilon})$ is equal...
The Jupiter Energetic Particle Detector Instruments (JEDI) on the Juno polar-orbiting, atmosphere-skimming, mission to will coordinate with several other space physics instruments spacecraft characterize and understand environment of Jupiter’s polar regions, specifically generation powerful aurora. JEDI comprises 3 nearly-identical measures at minimum energy, angle, ion composition distributions ions energies from H:20 keV O: 50 >1 MeV, energy angle distribution electrons <40 >500 keV. Each...
The Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE) on the two Van Allen spacecraft is magnetosphere ring current instrument that will provide data for answering three over-arching questions Program: RBSPICE determine “how space weather creates storm-time around Earth, how supplies and supports creation of radiation belt populations,” involved in losses. a time-of-flight versus total energy measures ions over range from ∼20 keV to ∼1 MeV. also measure electrons ∼25 MeV order...
The Energetic Particle Detector (EPD) Investigation is one of 5 fields-and-particles investigations on the Magnetospheric Multiscale (MMS) mission. MMS comprises 4 spacecraft flying in close formation highly elliptical, near-Earth-equatorial orbits targeting understanding fundamental physics important physical process called magnetic reconnection using Earth’s magnetosphere as a plasma laboratory. EPD two sensor types, Ion Spectrometer (EIS) with instrument each spacecraft, and Fly’s Eye...
We present a series of measurements based on ${K}_{L,S}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${K}_{L,S}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ decays collected in 1996--1997 by the $\mathrm{KTeV}$ experiment (E832) at Fermilab. compare these four $\stackrel{\ensuremath{\rightarrow}}{K}\ensuremath{\pi}\ensuremath{\pi}$ decay rates to measure direct $\mathrm{CP}$ violation parameter...
The renal and hemodynamic effects of intravenously administered fenoldopam mesylate, a novel dopamine-1 receptor agonist, were compared with those sodium nitroprusside in 28 patients (18 male; 26 black, two white; average age, 49 +/- 3 years) an blood pressure 219/137 mm Hg, most whom presented acute target organ damage. Fenoldopam lowered safely to 176/105 Hg; highly significant dose-response relations found for the 13 receiving 15 nitroprusside. Volume sodium, potassium, creatinine...
The KTeV/E799 experiment at Fermilab has searched for the rare kaon decay KL→π0e+e− . This mode is expected to have a significant CP violating component. measurement of its branching ratio could support standard model or indicate existence new physics. Letter reports results from 1999–2000 data set. One event observed with an background 0.99±0.35 events. We set limit on 3.5×10−10 90% confidence level. Combining previous result based taken in 1997 yields final KTeV result:...
Since the introduction of 24-h ambulatory blood pressure monitoring (ABPM), some studies, although not all, have suggested presence a blunted nocturnal decline in black versus white subjects, difference that may help explain higher incidence target organ damage blacks. To better define ethnic differences diurnal hemodynamic profiles, we studied ABPM recordings from 275 (55.6% women) and 246 (43.1% previously untreated with similar age distribution (from 20 to 79 years) wide range systolic...
The branching ratio of the rare decay ${\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ has been measured precisely, using complete data set from KTeV E799-II experiment at Fermilab. We observe 794 candidate events ${K}_{L}\ensuremath{\rightarrow}3{\ensuremath{\pi}}^{0}$ as a source tagged ${\ensuremath{\pi}}^{0}$s. expected background is $52.7\ifmmode\pm\else\textpm\fi{}11.2$ events, predominantly high ${e}^{+}{e}^{\ensuremath{-}}$ mass...
We report the first evidence for decay Σ+→pμ+μ− from data taken by HyperCP (E871) experiment at Fermilab. Based on three observed events, branching ratio is B(Σ+→pμ+μ−)=[8.6−5.4+6.6(stat)±5.5(syst)]×10−8. The narrow range of dimuon masses may indicate that proceeds via a neutral intermediate state, Σ+→pP0,P0→μ+μ− with P0 mass 214.3±0.5 MeV/c2 and B(Σ+→pP0,P0→μ+μ−)=[3.1−1.9+2.4(stat)±1.5(syst)]×10−8.Received 3 November 2004DOI:https://doi.org/10.1103/PhysRevLett.94.021801©2005 American...
The transverse momentum of charged particles produced within the pseudorapidity range η=-0.36 to +1.0 has been measured in p¯p collisions at √s =1.8 TeV. charged-particle multiplicity each event was with a 240-element cylindrical hodoscope system covering -3.25<η<3.25. average as function density per unit is presented. Events are observed high 32 pseudorapidity.Received 28 January 1988DOI:https://doi.org/10.1103/PhysRevLett.60.1622©1988 American Physical Society
Abstract We present a time‐of‐flight mass spectrometer design for the measurement of ions in ~30 keV to 10 MeV range protons (up ~40 and ~150 He heavy ions, respectively) 1 electrons, covering half sky with 80 apertures. The instrument, known as “Mushroom,” owing its shape, solves field view problem magnetospheric heliospheric missions that employ three‐axis stabilized spacecraft, yet still require extended angular coverage; Mushroom is also compatible spinning spacecraft. most important new...
The yields and average transverse momenta of pions, kaons, antiprotons produced at the Fermilab $\overline{p}p$ collider $\sqrt{s}=300, 540, 1000, \mathrm{and} 1800$ GeV are presented compared with data from energies reached CERN collider. We also present on dependence momentum $〈{p}_{t}〉$ particle ratios as a function charged density $\frac{d{N}_{c}}{d\ensuremath{\eta}}$; for densities high six times value, corresponding to Bjorken energy 6 GeV/${\mathrm{fm}}^{3}$, reported. These relevant...
The yields and the transverse-momentum distributions of pions, kaons, antiprotons produced in central region p¯p collisions at √s =1.8 TeV Fermilab Tevatron collider have been measured up to a charged-particle pseudorapidity density approximately 20. average transverse momentum 〈pt〉 as function 〈dNc/dη〉 for all three types particles is presented.Received 14 July 1989DOI:https://doi.org/10.1103/PhysRevLett.64.991©1990 American Physical Society
We present new measurements of ${K}_{L}$ semileptonic form factors using data collected in 1997 by the KTeV (E832) experiment at Fermilab. The are based on $1.9\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{\mp}}\ensuremath{\nu}$ and $1.5\ifmmode\times\else\texttimes\fi{}{10}^{6}$...
We report the first observation of a manifestly CP violating effect in K(L)-->pi(+)pi(-)e(+)e(-) decay mode. A large asymmetry was observed distribution these decays CP-odd and T-odd angle straight phi between planes e(+)e(-) pi(+)pi(-) pairs K(L) center mass system. After acceptance corrections, overall is found to be [13.6+/-2. 5(stat)+/-1.2(syst)]%. This largest CP-violating yet when integrating over entire phase space mode such an angular variable.
We present a determination of the Cabibbo-Kobayashi-Maskawa parameter |V(us)| based on new measurements six largest K(L) branching fractions and semileptonic form factors by KTeV (E832) experiment at Fermilab. find |V(us)|=0.2252+/-0.0008(KTeV)+/-0.0021(ext), where errors are from external sources. also use measured to determine CP violation |eta(+-)|=(2.228+/-0.005(KTeV)+/-0.009(ext))x10(-3).
We present new measurements of the six largest branching fractions ${K}_{L}$ using data collected in 1997 by KTeV experiment (E832) at Fermilab. The results are $B({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\mathrm{e}}^{\ensuremath{\mp}}\ensuremath{\nu})=0.4067\ifmmode\pm\else\textpm\fi{}0.0011$,...
The Energetic Particle Instrument–Low Energy (EPI-Lo) experiment has detected several weak, low-energy (∼30–300 keV nucleon–1) solar energetic particle (SEP) events during its first two closest approaches to the Sun, providing a unique opportunity explore sources of acceleration. As part Parker Solar Probe (PSP) Integrated Science Investigation Sun (IS⊙IS) suite, EPI-Lo was designed investigate physics particles; however, in special lowest-energy "time-of-flight only" product used this...
We present a measurement of the charge asymmetry delta(L) in mode K(L)-->pi(+/-)e(-/+)nu based on 298 x 10(6) analyzed decays. measure value = [3322+/-58(stat)+/-47(syst)]x10(-6), good agreement with previous measurements and 2.4 times more precise than current best published result. The result is used to place stringent limits CPT DeltaS DeltaQ violation neutral kaon system.
We report on a search for the decay KL→π0ν¯ν, carried out as part of E799-II, rare KL experiment at Fermilab. Within standard model, KL→π0ν¯ν is dominated by direct CP violating processes, and thus an observation implies confirmation violation. No events were observed, we set upper limit branching ratio to be <5.9×10−7 90% confidence level.Received 8 July 1999DOI:https://doi.org/10.1103/PhysRevD.61.072006©2000 American Physical Society
We have searched for ${\ensuremath{\theta}}^{+}(1.54)\ensuremath{\rightarrow}{K}^{0}p$ decays using data from the 1999 run of HyperCP experiment at Fermilab. see no evidence a narrow peak in ${K}_{S}^{0}p$ mass distribution near $1.54\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$ among 106 000 candidates, and obtain an upper limit fraction ${\ensuremath{\theta}}^{+}(1.54)$ to candidates $<0.3%$ 90% confidence.