Publications (65)
Technical Supplement to "Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q = 2.5, 5.2, 6.8, and 8.5 GeV"
A. J. R. Puckett, E. J. Brash, M. K. Jones +103
The GEp-III and GEp-2 experiments, carried out in Jefferson Lab's Hall C from 2007-2008, consisted of measurements of polarization transfer in elastic electron-proton scatterin…
A Precision Measurement of the Neutron Twist-3 Matrix Element : Probing Color Forces
M. Posik, D. Flay, D. S. Parno +89
Double-spin asymmetries and absolute cross sections were measured at large Bjorken (0.25 0.90), in both the deep-inelastic and resonance regions, by scattering lo…
Measurement of Rlt and Atl in the 4He(e,e'p)3H Reaction at pmiss of 130-300 MeV/c
K. A. Aniol, M. B. Epstein, E. Gama +41
We have measured the 4He(e,e'p)3H reaction at missing momenta of 130-300 MeV/c using the three-spectrometer facility at the Mainz microtron MAMI. Data were taken in perpendicular k…
Probing for high momentum protons in He via the reaction
S. Iqbal, F. Benmokhtar, M. Ivanov +107
Experimental cross sections for the reaction up to a missing momentum of 0.632 GeV/ at and =2(GeV/) are reported. The data are compared to…
Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering
M. E. Christy, T. Gautam, L. Ou +167
We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q) up to 15.75~\gevsq. Combined with existing data, these p…
Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q^2 = 8.5 GeV^2
A. J. R. Puckett, E. J. Brash, M. K. Jones +103
Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics…
Measurement of double-polarization asymmetries in the quasi-elastic process
The Jefferson Lab Hall A Collaboration, M. MihoviloviÄ, G. Jin +96
We present a precise measurement of double-polarization asymmetries in the reaction. This particular process is a uniq…
Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the 4He(e,e'pN) Triple-Coincidence Reaction
I. Korover N. Muangma, O. Hen, R. Shneor +115
We studied simultaneously the 4He(e,e'p), 4He(e,e'pp), and 4He(e,e'pn) reactions at Q^2=2 [GeV/c]2 and x_B>1, for a (e,e'p) missing-momentum range of 400 to 830 MeV/c. The knocked-…
Measurement of the Vector and Tensor Asymmetries at Large Missing Momentum in Quasielastic Electron Scattering from Deuterium
A. DeGrush, A. Maschinot, T. Akdogan +41
We report the measurement of the beam-vector and tensor asymmetries and in quasielastic electrodisintegration of the deuteron at the MIT…
Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction
J. Katich, X. Qian, Y. X. Zhao +113
We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction He on a pola…
Quasielastic 12C(e,e'p) Reaction at High Momentum Transfer
J. H. Morrison, H. Baghaei, W. Bertozzi +22
We measured the 12C(e,e'p) cross section as a function of missing energy in parallel kinematics for (q,w) = (970 MeV/c, 330 MeV) and (990 MeV/c, 475 MeV). At w=475 MeV, at the maxi…
Measurements of and : Probing the neutron spin structure
D. Flay, M. Posik, D. S. Parno +88
We report on the results of the E06-014 experiment performed at Jefferson Lab in Hall A, where a precision measurement of the twist-3 matrix element of the neutron ($d_{2}^{n…
Search for effects beyond the Born approximation in polarization transfer observables in elastic scattering
M. Meziane, E. J. Brash, R. Gilman +108
Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, $G_…
Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements
R. Cruz-Torres, D. Nguyen, F. Hauenstein +125
We report the first measurement of the \eep three-body breakup reaction cross sections in helium-3 (He) and tritium (H) at large momentum transfer ($\langle Q^2 \rangle \ap…
Precision Measurements of in the Deep Inelastic Regime
D. S. Parno, D. Flay, M. Posik +89
We have performed precision measurements of the double-spin virtual-photon asymmetry on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acc…
Measuring short-range correlations and quasi-elastic cross sections in A(e,e') at x>1 and modest Q
Y. P. Zhang, Z. H. Ye, D. Nguyen +96
We present results from the Jefferson Lab E08-014 experiment, investigating short-range correlations (SRC) through measurements of inclusive quasi-elastic scattering from H, $^…
Search for Quadrupole Strength in the Electro-excitation of the Delta(1232)
C. Mertz, C. Vellidis, R. Alarcon +40
High-precision H(e,e'p)pi0 measurements at Q2=0.126 (GeV/c)2 are reported, which allow the determination of quadrupole amplitudes in the gamma* N->Delta transition; they simultaneo…
Comparing proton momentum distributions in and 3 nuclei via H H and He measurements
R. Cruz-Torres, S. Li, F. Hauenstein +125
We report the first measurement of the reaction cross-section ratios for Helium-3 (He), Tritium (H), and Deuterium (). The measurement covered a missing moment…
Single Spin Asymmetries in Charged Kaon Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely Polarized Target
Y. X. Zhao, Y. Wang, K. Allada +113
We report the first measurement of target single spin asymmetries of charged kaons produced in semi-inclusive deep inelastic scattering of electrons off a transversely polarized $^…
DarkLight: A Search for Dark Forces at the Jefferson Laboratory Free-Electron Laser Facility
J. Balewski, J. Bernauer, W. Bertozzi +64
We give a short overview of the DarkLight detector concept which is designed to search for a heavy photon A' with a mass in the range 10 MeV/c^2 < m(A') < 90 MeV/c^2 and which deca…
A Measurement of the Interference Structure Function, R_LT, for the 12C(e,e'p) reaction in the Quasielastic Region
M. Holtrop, D. Jordan, T. McIlvain +34
The coincidence cross-section and the interference structure function, R_LT, were measured for the 12C(e,e'p) 11B reaction at quasielastic kinematics and central momentum transfer…
Search for three-nucleon short-range correlations in light nuclei
Z. Ye, P. Solvignon, D. Nguyen +100
We present new data probing short-range correlations (SRCs) in nuclei through the measurement of electron scattering off high-momentum nucleons in nuclei. The inclusive 4He/3He cro…
Extraction of the Neutron Electric Form Factor from Measurements of Inclusive Double Spin Asymmetries
V. Sulkosky, G. Jin, E. Long +89
Measurements of the neutron charge form factor, , are challenging due to the fact that the neutron has no net charge. In addition, measurements of the neutron…
Proton and Neutron Momentum Distributions in A = 3 Asymmetric Nuclei
O. Hen, L. B. Weinstein, S. Gilad +1
A proposal approved by the Jefferson Lab (JLab) PAC to study the proton-to-neutron momentum distribution ratio in A=3 nuclei via (e,e'p) scattering off 3He and 3H mirror nuclei. Th…
Novel observation of isospin structure of short-range correlations in calcium isotopes
D. Nguyen, Z. Ye, P. Aguilera +101
Short Range Correlations (SRCs) have been identified as being responsible for the high momentum tail of the nucleon momentum distribution, n(k). Hard, short-range interactions of n…
Measurements of the Generalized Electric and Magnetic Polarizabilities of the Proton at Low Q2 Using the VCS Reaction
P. Bourgeois, Y. Sato, J. Shaw +34
The mean square polarizability radii of the proton have been measured for the first time in a virtual Compton scattering experiment performed at the MIT-Bates out-of-plane scatteri…
Probing Cold Dense Nuclear Matter
R. Subedi, R. Shneor, P. Monaghan +62
The protons and neutrons in a nucleus can form strongly correlated nucleon pairs. Scattering experiments, where a proton is knocked-out of the nucleus with high momentum transfer a…
The EMC Effect of Tritium and Helium-3 from the JLab MARATHON Experiment
D. Abrams, H. Albataineh, B. S. Aljawrneh +131
Measurements of the EMC effect in the tritium and helium-3 mirror nuclei are reported. The data were obtained by the MARATHON Jefferson Lab experiment, which performed deep inelast…
Methods for Optical Calibration of the BigBite Hadron Spectrometer
M. Mihovilovic, K. Allada, B. D. Anderson +39
The techniques for optical calibration of Jefferson Lab's large-acceptance magnetic hadron spectrometer, BigBite, have been examined. The most consistent and stable results were ob…
Single Spin Asymmetries in Charged Pion Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely Polarized He Target
X. Qian, K. Allada, C. Dutta +112
We report the first measurement of target single spin asymmetries in the semi-inclusive reaction on a transversely polarized target. The experiment, conducted…
Isospin Dependence of the EMC effect and Short range Correlations
B. Schmookler, M. Duer, A. Schmidt +4
Recent studies have shown that the per-nucleon number of Short-Range Correlated (SRC) pairs in nuclei and the strength of the EMC effect are linearly correlated, increasing from li…
The Charge Form Factor of the Neutron at Low Momentum Transfer from the Reaction
E. Geis, V. Ziskin, T. Akdogan +45
We report new measurements of the neutron charge form factor at low momentum transfer using quasielastic electrodisintegration of the deuteron. Longitudinally polarized electrons a…
Single Spin Asymmetries of Inclusive Hadrons Produced in Electron Scattering from a Transversely Polarized He Target
K. Allada, Y. X. Zhao, K. Aniol +113
We report the first measurement of target single-spin asymmetries (A) in the inclusive hadron production reaction, +, using a transv…
High Precision Measurement of the Proton Elastic Form Factor Ratio at low
X. Zhan, K. Allada, D. S. Armstrong +68
We report a new, high-precision measurement of the proton elastic form factor ratio μ_p G_E/G_M for the four-momentum transfer squared Q^2 = 0.3-0.7 (GeV/c)^2. The measurement was…
Studying the Proton "Radius" Puzzle with μp Elastic Scattering
R. Gilman, E. J. Downie, G. Ron +45
The Proton Radius Puzzle is the inconsistency between the proton radius determined from muonic hydrogen and the proton radius determined from atomic hydrogen level transitions and…
Double Spin Asymmetries of Inclusive Hadron Electroproductions from a Transversely Polarized Target
The Jefferson Lab Hall A Collaboration, Y. X. Zhao, K. Allada +114
We report the measurement of beam-target double-spin asymmetries () in the inclusive production of identified hadrons, +$~^3\text{He}^{\uparrow}\rightarrow h…
A Comparison of Polarization Observables in Electron Scattering from the Proton and Deuteron
B. D. Milbrath, J. I. McIntyre, C. S. Armstrong +32
Recoil proton polarization observables were measured for both the p(,e) and d(,en reactions at two values o…
3He Spin-Dependent Cross Sections and Sum Rules
E94010 Collaboration, K. Slifer, M. Amarian +110
We present a measurement of the spin-dependent cross sections for the \vec{^3He}(\vec{e},e')X} reaction in the quasielastic and resonance regions at four-momentum transfer 0.1 < Q^…
Momentum sharing in imbalanced Fermi systems
O. Hen, M. Sargsian, L. B. Weinstein +138
The atomic nucleus is composed of two different kinds of fermions, protons and neutrons. If the protons and neutrons did not interact, the Pauli exclusion principle would force the…
Probing the core of the strong nuclear interaction
A. Schmidt, J. R. Pybus, R. Weiss +162
The strong nuclear interaction between nucleons (protons and neutrons) is the effective force that holds the atomic nucleus together. This force stems from fundamental interactions…
High-precision Studies of the He(e,ep) Reaction at the Quasielastic Peak
R. E. J. Florizone, W. Bertozzi, J. P. Chen +38
Precision studies of the reaction He(e,ep) using the three-spectrometer facility at the Mainz microtron MAMI are presented. All data are for quasielastic kinematics…
Measurement of the 12C(e,e'p)11B Two-Body Breakup Reaction at High Missing Momentum Values
P. Monaghan, R. Shneor, R. Subedi +81
The five-fold differential cross section for the 12C(e,e'p)11B reaction was determined over a missing momentum range of 200-400 MeV/c, in a kinematics regime with Bjorken x > 1 and…
Polarization Transfer Observables in Elastic Electron Proton Scattering at 2.5, 5.2, 6.8, and 8.5 GeV
A. J. R. Puckett, E. J. Brash, M. K. Jones +104
The GEp-III and GEp-2 experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of to the highest practically achiev…
Modified Structure of Protons and Neutrons in Correlated Pairs
B. Schmookler, M. Duer, A. Schmidt +6
The atomic nucleus is made of protons and neutrons (nucleons), that are themselves composed of quarks and gluons. Understanding how the quark-gluon structure of a nucleon bound in…
The Role of Mesons in the Electromagnetic Form Factors of the Nucleon
C. Crawford, T. Akdogan, R. Alarcon +44
The roles played by mesons in the electromagnetic form factors of the nucleon are explored using as a basis a model containing vector mesons with coupling to the continuum together…
Measurement of the Nucleon Structure Function Ratio by the Jefferson Lab MARATHON Tritium/Helium-3 Deep Inelastic Scattering Experiment
MARATHON Collaboration, D. Abrams, H. Albataineh +129
The ratio of the nucleon structure functions, , is determined by the MARATHON experiment from measurements of deep inelastic scattering of electrons from H a…
Beam-Target Double Spin Asymmetry A_LT in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized He-3 Target at 1.4<Q^2<2.7 GeV^2
J. Huang, K. Allada, C. Dutta +112
We report the first measurement of the double-spin asymmetry for charged pion electroproduction in semi\nobreakdash-inclusive deep\nobreakdash-inelastic electron scatterin…
In Medium Nucleon Structure Functions, SRC, and the EMC effect
O. Hen, L. B. Weinstein, S. Gilad +1
A proposal approved by the Jefferson Lab PAC to study semi-inclusive deep inelastic scattering (DIS) off the deuteron, tagged with high momentum recoiling protons or neutrons emitt…
Measurement of the Target-Normal Single-Spin Asymmetry in Quasi-Elastic Scattering from the Reaction He
Y. -W. Zhang, E. Long, M. MihoviloviÄ +89
We report the first measurement of the target single-spin asymmetry, , in quasi-elastic scattering from the inclusive reaction He on a He gas…
Hadrons in the Nuclear Medium
M. M. Sargsian, J. Arrington, W. Bertozzi +16
Quantum Chromodynamics, the microscopic theory of strong interactions, has not yet been applied to the calculation of nuclear wave functions. However, it certainly provokes a numbe…
Measurement of Parity-Violating Asymmetry in Electron-Deuteron Inelastic Scattering
D. Wang, K. Pan, R. Subedi +98
The parity-violating asymmetries between a longitudinally-polarized electron beam and an unpolarized deuterium target have been measured recently. The measurement covered two kinem…
What do we learn from (e,e'p) experiments
S. Gilad
The promise and limitations of studying nuclear structure and reactions using (e,e'p) reactions are discussed. A(e,e'p)A-1 reactions on complex nuclei are used to test new relativi…
Measurement of transparency ratios for protons from short-range correlated pairs
O. Hen, H. Hakobyan, R. Shneor +5
Nuclear transparency, Tp(A), is a measure of the average probability for a struck proton to escape the nucleus without significant re-interaction. Previously, nuclear transparencie…
Measurement of double-polarization asymmetries in the quasi-elastic process
M. MihoviloviÄ, G. Jin, E. Long +99
We report on a precise measurement of double-polarization asymmetries in electron-induced breakup of proceeding to and final states, pe…
Polarization components in photoproduction at photon energies up to 5.6 GeV
W. Luo, E. J. Brash, R. Gilman +107
We present new data for the polarization observables of the final state proton in the reaction. These data can be used to test predictions based on ha…
First measurement of unpolarized SIDIS cross section and cross section ratios from a He target
X. Yan, K. Allada, K. Aniol +114
The unpolarized semi-inclusive deep-inelastic scattering (SIDIS) differential cross sections in He() have been measured for the first time in Jefferson…
Final Analysis of Proton Form Factor Ratio Data at , 4.8 and 5.6 GeV
A. J. R. Puckett, E. J. Brash, O. Gayou +71
Precise measurements of the proton electromagnetic form factor ratio using the polarization transfer method at Jefferson Lab have revolutionized the understa…
Measurement of the single-spin asymmetry in quasi-elastic He() scattering at GeV
E. Long, Y. W. Zhang, M. Mihoviloviv +88
Due to the lack of free neutron targets, studies of the structure of the neutron are typically made by scattering electrons from either H or He targets. In order to extract…
A precision measurement of the () reaction at threshold
K. Chirapatpimol, M. H. Shabestari, R. A. Lindgren +91
New results are reported from a measurement of electroproduction near threshold using the reaction. The experiment was designed to determine precisel…
Measurement of the proton electric to magnetic form factor ratio from \vec ^1H(\vec e, e'p)
C. B. Crawford, A. Sindile, T. Akdogan +51
We report the first precision measurement of the proton electric to magnetic form factor ratio from spin-dependent elastic scattering of longitudinally polarized electrons from a p…
Measurement of the Induced Proton Polarization P_n in the 12C(e,e'\vec{p}) Reaction
R. J. Woo, D. H. Barkhuff, W. Bertozzi +31
The first measurements of the induced proton polarization, P_n, for the 12C (e,e'\vec{p}) reaction are reported. The experiment was performed at quasifree kinematics for energy and…
Virtual Compton Scattering and the Generalized Polarizabilities of the Proton at Q^2=0.92 and 1.76 GeV^2
H. Fonvieille, G. Laveissiere, N. Degrande +161
Virtual Compton Scattering (VCS) on the proton has been studied at Jefferson Lab using the exclusive photon electroproduction reaction (e p --> e p gamma). This paper gives a detai…
Measurement of pretzelosity asymmetry of charged pion production in Semi-Inclusive Deep Inelastic Scattering on a polarized He target
Y. Zhang, X. Qian, K. Allada +112
An experiment to measure single-spin asymmetries in semi-inclusive production of charged pions in deep-inelastic scattering on a transversely polarized He target was performed…
Electroexcitation of the at low momentum transfer
A. Blomberg, D. Anez, N. Sparveris +92
We report on new p measurements at the resonance at the low momentum transfer region. The mesonic cloud dynamics is predicted to be dominant…
Measurement of the R response function for electroproduction at = 0.070 (GeV/c) in the transition}
N. Sparveris, R. Alarcon, D. Barkhuff +44
Quadrupole amplitudes in the $γ^{*}N\toÎ$ transition are associated with the issue of nucleon deformation. A search for these small amplitudes has been the focus of a series of m…