N. S. Jarvis
A5082042971- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Nuclear Physics and Applications
- Radiation Dose and Imaging
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Graphite, nuclear technology, radiation studies
- Radioactive contamination and transfer
- Particle Detector Development and Performance
- Advancements in Photolithography Techniques
- Nuclear and radioactivity studies
- X-ray Spectroscopy and Fluorescence Analysis
- Fault Detection and Control Systems
- Air Quality Monitoring and Forecasting
- Inhalation and Respiratory Drug Delivery
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Scientific Computing and Data Management
- Radiation Effects and Dosimetry
- Advanced Data Storage Technologies
- Gas Dynamics and Kinetic Theory
Carnegie Mellon University
2016-2024
Ruhr University Bochum
2023
National and Kapodistrian University of Athens
2023
Covington and Burling
2006
East Carolina University
2000
University of York
1989-1995
University of Birmingham
1994-1995
International Commission on Radiological Protection
1994
We report on the measurement of γp→J/ψp cross section from E_{γ}=11.8 GeV down to threshold at 8.2 using a tagged photon beam with GlueX experiment. find that total falls toward less steeply than expected two-gluon exchange models. The differential dσ/dt has an exponential slope 1.67±0.39 GeV^{-2} 10.7 average energy. LHCb pentaquark candidates P_{c}^{+} can be produced in s channel this reaction. see no evidence for them and set model-dependent upper limits their branching fractions...
We report the total and differential cross sections for $J/\psi$ photoproduction with large acceptance GlueX spectrometer photon beam energies from threshold at 8.2~GeV up to 11.44~GeV over full kinematic range of momentum transfer squared, $t$. Such coverage facilitates extrapolation forward ($t = 0$) point beyond physical region. The section is used by many theoretical models plays an important role in understanding its relation $J/\psi-$proton interaction. These measurements near are also...
IMBA (Integrated Modules for Bioassay Analysis) is a suite of software modules that implement the current ICRP biokinetic and dosimetric models estimation intakes doses. The have gone through extensive quality assurance, are now used routine formal dose assessment by Approved Dosimetry Services throughout UK. HPA has continued to develop modules. In addition, several projects, sponsored organisations both in USA Canada, resulted development customised user-friendly interfaces (IMBA Expert™...
We report measurements of the photon beam asymmetry $\Sigma$ for reactions $\vec{\gamma}p\to p\pi^0$ and p\eta $ from GlueX experiment using a 9 GeV linearly-polarized, tagged incident on liquid hydrogen target in Jefferson Lab's Hall D. The asymmetries, measured as function proton momentum transfer, possess greater precision than previous $\pi^0$ are first $\eta$ this energy regime. results compared with theoretical predictions based $t$-channel, quasi-particle exchange constrain...
The GlueX experiment at Jefferson Lab ran with its first commissioning beam in late 2014 and the spring of 2015. Data were collected on both plastic liquid hydrogen targets, much detector has been commissioned. All systems are now performing or near design specifications events being fully reconstructed, including exclusive production π0, η ω mesons. Linearly-polarized photons successfully produced through coherent bremsstrahlung polarization transfer to ρ observed.
We measure for the first time differential photoproduction cross section $d\sigma/dt$ of $a_2(1320)$ meson at an average photon beam energy 8.5~GeV, using data with integrated luminosity 104~pb$^{-1}$ collected by GlueX experiment. fully reconstruct $\gamma p \to \eta\pi^0 p$ reaction and perform a partial-wave analysis in mass region amplitudes that incorporate linear polarization beam. This allows us to separate contributions natural- unnatural-parity exchanges. These measurements provide...
We present a search for axionlike particles, $a$, produced in photon-proton collisions at center-of-mass energy of approximately 4 GeV, focusing on the scenario where $a$-gluon coupling is dominant. The uses $a\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ and $a\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decays, data sample corresponding to an integrated luminosity $168\text{ }\text{...
In 1997, a collaboration between British Nuclear Fuels plc (BNFL), Westlakes Research Institute and NRPB started, with the aim of producing IMBA (Integrated Modules for Bioassay Analysis), suite software modules that implement new ICRP models estimation intakes doses. This was partly in response to UK regulations, due requirement unified approach estimating doses from bioassay measurements within UK. Over past 5 years, have been developed further, gone through extensive quality assurance,...
We report on the measurement of beam asymmetry $\mathrm{\ensuremath{\Sigma}}$ for reactions $\stackrel{P\vec}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}p\ensuremath{\eta}$ and $\stackrel{P\vec}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}p{\ensuremath{\eta}}^{\ensuremath{'}}$ from GlueX experiment using an 8.2--8.8-GeV linearly polarized tagged photon incident a liquid hydrogen target in Hall D at Jefferson Laboratory. These measurements are made as function momentum transfer...
The Central Drift Chamber is a straw-tube wire chamber of cylindrical structure located surrounding the target inside bore GlueX spectrometer solenoid. Its purpose to detect and track charged particles with momenta as low 0.25 GeV/c well identify low-momentum protons via energy loss. construction detector described its operation calibration are discussed in detail. design goal 150 microns position resolution has been reached.
In recent years, there has been a debate on whether considerable fraction of particles is retained after 24 h in the tracheobronchial region. present study, 8 healthy subjects inhaled 6.2-µm monodisperse Teflon labeled with 111In twice, at flow rates 0.45 and 0.045 L/s. According to theoretical calculations, L/s should deposit mainly large bronchi alveolar region, whereas be deposited small ciliated airways. Twenty-four hours inhalation, about half both modes inhalation had cleared....
Journal Article The IMBA Suite: Integrated Modules for Bioassay Analysis Get access A. Birchall, Birchall Search other works by this author on: Oxford Academic PubMed Google Scholar N.S. Jarvis, Jarvis M.S. Peace, Peace A.E. Riddell, Riddell W.P. Battersby Radiation Protection Dosimetry, Volume 79, Issue 1-4, 1 October 1998, Pages 107–110, https://doi.org/10.1093/oxfordjournals.rpd.a032369 Published: 01 1998
The primary motivation of the GlueX experiment is to search for and ultimately study pattern gluonic excitations in meson spectrum produced $γp$ collisions. Recent lattice QCD calculations predict a rich hybrid mesons that have both exotic non-exotic $J^{PC}$, corresponding $q\bar{q}$ states ($q=u,$ $d,$ or $s$) coupled with field. A thorough spectrum, including identification isovector triplet, charges 0 $\pm1$, isoscalar members, $|s\bar{s}\ >$ $|u\bar{u}\ > + |d\bar{d}\ >$, each...
The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5GeV photons impinging on a hydrogen target which is contained within detector with near-complete coverage for charged and neutral particles. We present measurements spin-density matrix elements the vector meson ρ(770). statistical precision achieved exceeds that previous experiments in this energy range by orders magnitude. confirm high degree s-channel helicity conservation small squared...
The spin-exotic hybrid meson π1(1600) is predicted to have a large decay rate the ωππ final state. Using 76.6 pb−1 of data collected with GlueX detector, we measure cross sections for reactions γp→ωπ+π−p, γp→ωπ0π0p, and γp→ωπ−π0Δ++ in range Eγ=8–10 GeV. isospin conservation, set first upper limits on photoproduction π10(1600) π1−(1600). We combine these lattice calculations widths find that η′π most sensitive two-body system search π1(1600). locked icon Physics Subject Headings...
Three groups, each consisting of 6 healthy subjects, inhaled, respectively, 6-µm (aerodynamic diameter), 8-µm, and 10-µm Teflon particles, labeled with indium-1ll. The particles were inhaled at an extremely low flow rate, 0.05 L/s. Lung retention was measured after 0, 24, 48, 72 h. Two models used to calculate particle deposition in the lungs various generations: Karolinska Institute model (KI model) University Southampton (US model). From experimental clearance data theoretical data, it...
Click to increase image sizeClick decrease sizeBronchioles Lung Retention Mucociliary Transport Particle Deposition
We report on the measurement of spin density matrix elements $\mathrm{\ensuremath{\Lambda}}(1520)$ in photoproduction reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}(1520){K}^{+}$, via its subsequent decay to ${K}^{\ensuremath{-}}p$. The was performed as part GlueX experimental program Hall D at Jefferson Laboratory using a linearly polarized photon beam with...
We propose to enhance the kaon identification capabilities of GlueX detector by constructing an FDIRC (Focusing Detection Internally Reflected Cherenkov) utilizing decommissioned BaBar DIRC components. The would significantly physics program allowing one search for and study hybrid mesons decaying into final states. Such systematic studies states are essential inferring quark flavor content conventional mesons. reuse one-third synthetic fused silica bars that were utilized in DIRC. A new...
We report a measurement of the π− photoproduction beam asymmetry for reaction →γp→π−Δ++ using data from GlueX experiment in photon energy range 8.2–8.8 GeV. The Σ is measured as function four-momentum transfer t to Δ++ and compared phenomenological models. find that varies t: negative at smaller values positive higher |t|. can be described theoretically by t-channel particle exchange requiring pseudoscalar, vector, tensor intermediaries. In particular, this requires charge exchange, allowing...