C. Palatchi
A5075052771- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Atomic and Molecular Physics
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Photocathodes and Microchannel Plates
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Atomic and Subatomic Physics Research
- Laser-Matter Interactions and Applications
- Crystallography and Radiation Phenomena
- Gyrotron and Vacuum Electronics Research
- Laser Design and Applications
- Radiation Detection and Scintillator Technologies
- Electron and X-Ray Spectroscopy Techniques
- Spectroscopy and Laser Applications
- Radiation Therapy and Dosimetry
- Pulsars and Gravitational Waves Research
- Advanced Chemical Physics Studies
- High-pressure geophysics and materials
University of Virginia
2018-2024
Stony Brook University
2024
State University of New York
2024
Virginia Tech
2022
Thomas Jefferson National Accelerator Facility
2021-2022
The Ohio State University
2014
We report a precision measurement of the parity-violating asymmetry $A_{PV}$ in elastic scattering longitudinally polarized electrons from $^{208}$Pb. measure $A_{PV}=550\pm 16 {\rm (stat)}\pm 8\ (syst)}$ parts per billion, leading to an extraction neutral weak form factor $F_W(Q^2 = 0.00616\ GeV}^2) 0.368 \pm 0.013$. Combined with our previous measurement, extracted neutron skin thickness is $R_n-R_p=0.283 0.071$~fm. The result also yields first significant direct interior density...
We report a precise measurement of the parity-violating (PV) asymmetry A_{PV} in elastic scattering longitudinally polarized electrons from ^{48}Ca. measure A_{PV}=2668±106(stat)±40(syst) parts per billion, leading to an extraction neutral weak form factor F_{W}(q=0.8733 fm^{-1})=0.1304±0.0052(stat)±0.0020(syst) and charge minus F_{ch}-F_{W}=0.0277±0.0055. The resulting neutron skin thickness R_{n}-R_{p}=0.121±0.026(exp)±0.024(model) fm is relatively thin yet consistent with many model...
Photoionization by an eXtreme UltraViolet (XUV) attosecond pulse train (APT) in the presence of infrared (RABBITT method) conveys information about atomic photoionization delay. By taking difference spectral delays between pairs rare gases (Ar,He), (Kr,He) and (Ne,He) it is possible to eliminate each case larger group delay ('attochirp') associated with APT itself obtain Ar, Kr Ne Wigner referenced model calculations He In this work we measure how vary as a function XUV photon energy but...
We report precision determinations of the beam-normal single spin asymmetries (A_{n}) in elastic scattering 0.95 and 2.18 GeV electrons off ^{12}C, ^{40}Ca, ^{48}Ca, ^{208}Pb at very forward angles where most detailed theoretical calculations have been performed. The first measurements A_{n} for ^{40}Ca ^{48}Ca are found to be similar that consistent with expectations thus demonstrating validity nuclei Z≤20. also two new momentum transfers (Q^{2}) extending previous measurement. Our data...
A mass spectroscopy experiment with a pair of nearly identical high-resolution spectrometers and tritium target was performed in Hall at Jefferson Lab. Utilizing the (e,e′K+) reaction, enhancements, which may correspond to possible Λnn resonance ΣNN states, were observed an energy resolution about 1.21 MeV (σ), although greater statistics are needed make definitive identifications. An experimentally measured state provide unique constraint determining Λn interaction, for no scattering data...
We report on the first ${Q}^{2}$-dependent measurement of beam-normal single spin asymmetry ${A}_{n}$ in elastic scattering 570 MeV vertically polarized electrons off $^{12}\mathrm{C}$. cover ${Q}^{2}$ range between 0.02 and $0.05\text{ }\text{ }{\mathrm{GeV}}^{2}/{c}^{2}$ determine at four different values. The experimental results are compared to a theoretical calculation that relates imaginary part two-photon exchange amplitude. result emphasizes behavior given by ratio Compton charge...
We report a high precision measurement of electron beam polarization using Compton polarimetry. The was made in experimental Hall A at Jefferson Lab during the CREX experiment 2020. total uncertainty dP/P=0.36% achieved detecting back-scattered photons from scattering process. This is highest accuracy ever reported, surpassing ground-breaking SLAC Large Detector (SLD) polarimeter. Such reaches level required for future flagship measurements to be by MOLLER and SoLID experiments.
The small binding energy of the hypertrition leads to predictions non-existence bound hypernuclei for isotriplet three-body systems such as $nn\Lambda$. However, invariant mass spectroscopy at GSI has reported events that may be interpreted $nn\Lambda$ state. state was sought by missing-mass via $(e,e'K^+)$ reaction Jefferson Lab's experimental Hall A. present experiment higher sensitivity $nn\Lambda$-state investigation in terms better precision a factor about three. analysis shown this...
Parity-violating electron-scattering experiments represent an important focus of the nuclear physics experimental program at Continuous Electron Beam Accelerator Facility (CEBAF) Jefferson Lab. These pose significant challenges because scattering asymmetries can be very small, order parts-per-million and smaller. To succeed, properties electron beam such as current, position, size energy, must nearly identical in two electron-polarization spin states (parallel anti-parallel relative to...
In 2018, the E12-17-003 experiment was conducted at Thomas Jefferson National Accelerator Facility (JLab) to explore possible existence of an nnLambda state in reconstructed missing mass distribution from a tritium gas target. As part this investigation, data also collected using gaseous hydrogen target, not only for precise absolute scale calibration but study Lambda/Sigma^0 electroproduction. This dataset acquired Q^2~0.5 (GeV/c)^2, W=2.14 GeV, and theta_{gamma K}^{c.m.}~8 deg. It covers...
Inclusive electron scattering at carefully chosen kinematics can isolate from short-range correlations (SRCs), produced through hard, short-distance interactions of nucleons in the nucleus. Because two-nucleon (2N) SRCs arise same N-N interaction all nuclei, cross section SRC-dominated regime is identical up to an overall scaling factor, and A/2H ratio constant this region. This behavior has been used identify SRC dominance map out contribution for a wide range nuclei. We examine lower...
In 2018, the E12-17-003 experiment was conducted at Thomas Jefferson National Accelerator Facility (JLab) to explore possible existence of an $nn\mathrm{\ensuremath{\Lambda}}$ state in reconstructed missing mass distribution from a tritium gas target [K. N. Suzuki et al., Prog. Theor. Exp. Phys. 2022, 013D01 (2022); B. Pandey Rev. C 105, L051001 (2022)]. As part this investigation, data were also collected using gaseous hydrogen target, not only for precise absolute scale calibration but...
We propose to measure the beam normal single spin asymmetry in elastic scattering of transversely polarized electron from target nuclei with 12 $\leq Z \leq$ 90 at Q$^2$ = 0.0092 GeV$^2$ study its nuclear dependence. While theoretical calculations based on two-photon exchange suggest no dependence this kinematics, results 208Pb Jefferson Lab show a striking disagreement both predictions and light measurements. The proposed measurements will provide new data for intermediate heavy where...
MOLLER is a future experiment designed to measure parity violation in Moller scattering extremely high precision. will the right-left differential cross-section parity-violating asymmetry APV , elastic of polarized electrons off an unpolarized LH2 target extreme ppb To make this measurement, electron source, generated with circularly laser beam, must have ability switch quickly between right and left helicity polarization states. The source also maintain minimal correlated beam asymmetries,...
We study photoionization of various noble gas atoms by attosecond pulses produced in High Harmonic Generation (HHG). use a pump-probe experiment to measure the time delays electrons photoionized from Neon, Argon, and Krypton relative those Helium atoms. The Attosecond Pulse Train (APT) is characterized delay gases measured. Ne, Ar, Kr determined using previously calculated values for He atomic associated with probe process.
Missing-mass spectroscopy with the 3 H( e , e′K + ) reaction was carried out at Jefferson Lab’s (JLab) Hall A in Oct–Nov, 2018. The differential cross section for γ ∗ K )Λ nn deduced ω = Ee − E e′ 2.102 GeV and forward -scattering angle (0 ° ≤ θ 5 laboratory frame. Given typical predicted energies decay widths, which are ( B Λ Γ) (−0.25, 0.8) (−0.55, 4.7) MeV, sections were found to be 11.2 ± 4.8(stat.) +4.1 −2.1 (sys.) 18.1 6.8(stat.) +4.2 −2.9 nb/sr, respectively. obtained result would...
We performed an experiment using tritium and hydrogen cryogenic gas targets at Thomas Jefferson National Accelerator Facility (JLab) in 2018 (E12-17-003)[1, 2]. In this article, we discuss the Λ/Σ 0 hyperon electroproduction from target. Elementary production processes are important not only for absolute mass scale calibration our experiment, but also study of mechanisms themselves. reported results differential cross section p ( e , e’K + )Λ/Σ reaction Q 2 ∼ 0.5 (GeV/ c ) .
Abstract. An nn Λ is a neutral baryon system with no charge. The study of the pure Λ-neutron such as gives us information on n interaction. search experiment (E12-17-003) was performed at JLab Hall A in 2018. In this article, FSI investigated by shape analysis 3 H( e , e′K + ) X missing mass spectrum, and preliminary result for given.