0000000000729766

AUTHOR

Gerald Feldman

showing 4 related works from this author

International workshop on next generation gamma-ray source

2022

Journal of physics / G 49(1), 010502 (2022). doi:10.1088/1361-6471/ac2827

Accelerator Physics (physics.acc-ph)Nuclear and High Energy Physics[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]Nuclear Theorynucleon: structurepi: photoproduction[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph]conference summarynuclear astrophysicsFOS: Physical scienceslow-energy QCD[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]530bremsstrahlung01 natural scienceselectron: acceleratorNuclear Theory (nucl-th)parity: violationnuclear physicsquantum chromodynamics0103 physical sciencesAgency (sociology)ddc:530gamma-rayApplied researchNuclear Experiment (nucl-ex)010306 general physicsphoton: beamNuclear Experimentactivity reportenergy: lowPhysicsastrophysics010308 nuclear & particles physicsInformation sharinglaserhadronic parity violationgamma raynuclear structureSystems engineeringPhysics - Accelerator PhysicsCompton scatteringJournal of Physics G: Nuclear and Particle Physics
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Beam-Helicity Asymmetries in Double-Charged-Pion Photoproduction on the Proton

2005

Beam-helicity asymmetries for the two-pion-photoproduction reaction gamma + p --> p pi+ pi- have been studied for the first time in the resonance region for center-of-mass energies between 1.35 GeV and 2.30 GeV. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons incident on an unpolarized hydrogen target. Beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries exhibit strong sensitivity to the kinematics and dynamics of the reaction. The data are compared with the results of various phenomenological model calculations, and show that these…

Particle physicsPhotonProtonGeneral Physics and AstronomyFOS: Physical sciences13.60.-r 13.60.Le 13.88.+e[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)Pion0103 physical sciencesPhenomenological model[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Nuclear Experiment (nucl-ex)010306 general physicsNuclear ExperimentNuclear ExperimentPhysics010308 nuclear & particles physicsBremsstrahlungHelicity3. Good healthPair productionNucleon
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Near-threshold $\pi^-$ photoproduction on the deuteron

2018

The first experimental investigation of the near-threshold cross section for incoherent $\pi^-$ photoproduction on the deuteron $\gamma$ d -> $\pi^-$ pp is presented. The experimental technique involved detection of the ~131 MeV gamma ray resulting from the radiative capture of photoproduced $\pi^-$ in the target. The total cross section has been measured using an unpolarized tagged-photon beam, a liquid-deuterium target, and three very large NaI(Tl) spectrometers. The data are compared to theoretical models that give insight into the elementary reaction $\gamma$ n -> $\pi^-$ p and pion-nucleon and nucleon-nucleon final-state interactions.

PhysicsSpectrometer010308 nuclear & particles physicsRadiative captureNuclear TheoryTheoretical models01 natural sciences3. Good healthNuclear physicsNear thresholdCross section (physics)Deuterium0103 physical sciencesElementary reaction010306 general physicsNuclear ExperimentNuclear ExperimentBeam (structure)
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Compton Scattering from the Deuteron below Pion-Production Threshold

2015

Differential cross sections for elastic scattering of photons from the deuteron have recently been measured at the Tagged-Photon Facility at the MAX IV Laboratory in Lund, Sweden. These first new measurements in more than a decade further constrain the isoscalar electromagnetic polarizabilities of the nucleon and provide the first-ever results above 100 MeV, where the sensitivity to the polarizabilities is increased. We add 23 points between 70 and 112 MeV, at angles 60deg, 120deg and 150deg. Analysis of these data using a Chiral Effective Field Theory indicates that the cross sections are both self-consistent and consistent with previous measurements. Extracted values of \alpha_s = [12.1 +…

Elastic scatteringNuclear reactionPhysicsNuclear and High Energy PhysicsPhoton010308 nuclear & particles physicsScatteringIsoscalarCompton scatteringFOS: Physical sciences01 natural sciences3. Good healthNuclear physicsPion0103 physical sciencesNuclear Experiment (nucl-ex)010306 general physicsNucleonNuclear Experiment
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