T<scp>HE</scp>C<scp>ONTINUOUS</scp>E<scp>LECTRON</scp>B<scp>EAM</scp>A<scp>CCELERATOR</scp>F<scp>ACILITY</scp>: CEBAF at the Jefferson Laboratory

Leemann, Ch.; Douglas, D.; Krafft, Geoffrey

doi:10.1146/annurev.nucl.51.101701.132327

Cited by 227 publications

(242 citation statements)

References 32 publications

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“…The experiment E94-104 was carried out in Jlab [49] Hall A [50], using the continuous electron beam at currents around 30 µA. The core of the Hall A equipment is a pair of nearly identical 4 GeV/c spectrometers capable of determining the momentum and angles of charged particles with high resolution.…”

Section: Methodsmentioning

confidence: 99%

Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV

Zhu¹,

Arrington²,

Averett³

et al. 2005

Phys. Rev. C

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The differential cross sections for the γ n → π − p and the γp → π + n processes were measured at Jefferson Lab. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles varied from 50 • to 110 • . The π − and π + photoproduction data both exhibit a global scaling behavior at high energies and high transverse momenta, consistent with the constituent counting rule prediction and the existing π + data. The data suggest possible substructure of the scaling behavior, which might be oscillations around the scaling value. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV. The differential cross section ratios [dσ/dt(γ n → π − p)/dσ/dt(γp → π + n)] at high energies and high transverse momenta can be described by calculations based on one-hard-gluon-exchange diagrams.

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Section: Methodsmentioning

confidence: 99%

Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV

Zhu¹,

Arrington²,

Averett³

et al. 2005

Phys. Rev. C

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“…Detailed descriptions of the accelerator and its strained GaAs polarized electron source can be found in Refs. [55][56][57][58].…”

Section: The Experimentsmentioning

confidence: 99%

Precise determination of the deuteron spin structure at low to moderateQ2with CLAS and extraction of the neutron contribution

Guler¹,

Fersch²,

Kuhn³

et al. 2015

Phys. Rev. C

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Precise determination of the deuteron spin structure at low to moderate Q^{2} with CLAS and extraction of the neutron contribution We present the final results for the deuteron spin structure functions obtained from the full data set collected with Jefferson Lab's CLAS in 2000-2001. Polarized electrons with energies of 1.6, 2.5, 4.2 and 5.8 GeV were scattered from deuteron ( 15 ND3) targets, dynamically polarized along the beam direction, and detected with CLAS. From the measured double spin asymmetry, the virtual photon absorption asymmetry A d 1 and the polarized structure function g d 1 were extracted over a wide kinematic range (0.05 GeV 2 < Q 2 < 5 GeV 2 and 0.9 GeV < W < 3 GeV). We use an unfolding procedure and a parametrization of the corresponding proton results to extract from these data the polarized structure functions A n 1 and g n 1 of the (bound) neutron, which are so far unknown in the resonance region, W < 2 GeV. We compare our final results, including several moments of the deuteron and neutron spin structure functions, with various theoretical models and expectations as well as parametrizations of the world data. The unprecedented precision and dense kinematic coverage of these data can aid in future extractions of polarized parton distributions, tests of perturbative QCD predictions for the quark polarization at large x, a better understanding of quark-hadron duality, and more precise values for higher-twist matrix elements in the framework of the Operator Product Expansion.

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“…The Continuous Electron Beam Accelerator Facility (CEBAF) at JLab provides the multi-GeV continuous wave beams essential for experiments at the nuclear and particle physics interface [1]. The race-track shaped accelerator comprised two linear accelerators linked together (total of 338 accelerating cavities) and was able to accelerate electron beam bunches up to 6 GeV by recirculating the beam up to five times 1 (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Study of the Few Nucleon Systems at CLAS

Zachariou¹

2017

Few-Body Syst

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The study of few nucleon systems with electromagnetic probes is an essential component of the scientific program carried out at the Thomas Jefferson National Accelerator Facility (JLab). Here we present measurements of exclusive reactions on light nuclei using real photon beams with energies up to 3 GeV and the CEBAF Large Acceptance Spectrometer (CLAS), a nearly 4π magnetic spectrometer, in order to study the properties of strongly interacting matter and the transition from hadronic (i.e in terms of nucleons and mesons) to partonic (in terms of quark and gluons) degrees of freedom in nuclear interactions. We discuss the progress made in understanding the relevant degrees of freedom using polarisation observables and cross sections of deuteron and 3 He photodisintegration in the few-GeV photon-energy region. In addition, recent high-statistics experiments with the CLAS detector have provided us with sufficient counting rates to study the effects of initial-and final-state interactions in reactions off the deuteron. Such data allow us to extract a large set of polarisation observables for final-state interactions in hyperon photoproduction and to study the properties of the hyperon-nucleon interaction. Initial-state effects are studied by mapping the dependence of experimental observables on the spectator-nucleon momentum. We also present recent results for polarisation observables for quasi-free K + Λ off the bound proton in a deuteron as well as for final-state interactions in the reaction γ d → K + Λn, and will discuss their impact on hyperon-nucleon studies.

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THECONTINUOUSELECTRONBEAMACCELERATORFACILITY: CEBAF at the Jefferson Laboratory

Cited by 227 publications

References 32 publications

Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV

Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV

Precise determination of the deuteron spin structure at low to moderateQ2with CLAS and extraction of the neutron contribution

Study of the Few Nucleon Systems at CLAS

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