Publications (51)
The stellar population of the Globular Cluster M 3. II: CCD photometry of additional 10,000 stars
F. R. Ferraro, E. Carretta, C. E. Corsi +5
We present BVI CCD photometry for more than 10,000 stars in the innermost region (0.3' < r <~ 4') of the globular cluster M 3. When added to the previous photographic photometry by…
Deeply virtual Compton scattering cross section at high Bjorken
F. Georges, M. N. H. Rashad, A. Stefanko +159
We report high-precision measurements of the Deeply Virtual Compton Scattering (DVCS) cross section at high values of the Bjorken variable . DVCS is sensitive to the Generaliz…
Workshop on High-Intensity Photon Sources (HIPS2017) Mini-Proceedings
S. Ali, L. Allison, M. Amaryan +39
This workshop aimed at producing an optimized photon source concept with potential increase of scientific output at Jefferson Lab, and at refining the science for hadron physics ex…
Physics with Positron Beams at Jefferson Lab 12 GeV
A. Afanasev, I. Albayrak, S. Ali +124
Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental program at the next generation of lepton accelerators. In the context o…
First measurement of the polarization observable and helicity-dependent cross sections in single photoproduction from quasi-free nucleons
M. Dieterle, L. Witthauer, F. Cividini +84
The double-polarization observable and the helicity-dependent cross sections and have been measured for the first time for single photoproduction…
Quasi-free photoproduction of eta-mesons off 3He nuclei
L. Witthauer, D. Werthmueller, I. Keshelashvili +70
Quasi-free photoproduction of -mesons has been measured off nucleons bound in He nuclei for incident photon energies from the threshold region up to 1.4 GeV. The experiment…
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…
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…
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…
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…
Measurements of Double-Polarized Compton Scattering Asymmetries and Extraction of the Proton Spin Polarizabilities
P. P. Martel, R. Miskimen, P. Aguar-Bartolome +76
The spin polarizabilities of the nucleon describe how the spin of the nucleon responds to an incident polarized photon. The most model-independent way to measure the nucleon spin p…
The LUX-ZEPLIN (LZ) Experiment
The LZ Collaboration, D. S. Akerib, C. W. Akerlof +379
We describe the design and assembly of the LUX-ZEPLIN experiment, a direct detection search for cosmic WIMP dark matter particles. The centerpiece of the experiment is a large liqu…
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-…
First measurement of target and beam-target asymmetries in the reaction
J. R. M. Annand, H. J. Arends, R. Beck +64
The first data on target and beam-target asymmetries for the reaction at photon energies from 1050 up to 1450 MeV are presented. The measurements were performed usi…
Determination of the scalar polarizabilities of the proton using beam asymmetry in Compton scattering
V. Sokhoyan, E. J. Downie, E. Mornacchi +73
The scalar dipole polarizabilities, and , are fundamental properties related to the internal dynamics of the nucleon. The currently accepted values of the proton…
Measurement of the g p -> K^0 Sigma^+ reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron
P. Aguar-Bartolomé, J. R. M. Annand, H. J. Arends +75
The g p -> K^0 Sigma^+ reaction has been measured from threshold to Eg=1.45 GeV (W_cm=1.9 GeV) using the Crystal Ball and TAPS multiphoton spectrometers together with the photon ta…
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…
Angular dependence of recoil proton polarization in high-energy γd \to p n
X. Jiang, J. Arrington, F. Benmokhtar +52
We measured the angular dependence of the three recoil proton polarization components in two-body photodisintegration of the deuteron at a photon energy of 2 GeV. These new data pr…
Measurement of the transverse target and beam-target asymmetries in meson photoproduction at MAMI
C. S. Akondi, J. R. M. Annand, H. J. Arends +67
We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in the reaction up to a center-of-mass energ…
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_…
First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p reaction
V. L. Kashevarov, A. Fix, P. Aguar-Bartolomé +74
The circular photon asymmetry for pi0 eta photoproduction on the proton was measured for the first time at the tagged photon facility of the MAMI C accelerator using the Crystal Ba…
Lyman Limit Imaging of High Redshift Galaxies. III. New Observations of 4 QSO Fields
C. Steidel, M. Pettini, D. Hamilton
We present the results of deep Lyman limit imaging in four new fields as part of a continuing search for galaxies at . The technique uses a custom broad--band fi…
Photoproduction of -pairs off protons and off neutrons
M. Dieterle, M. Oberle, J. Ahrens +71
Total cross sections, angular distributions, and invariant-mass distributions have been measured for the photoproduction of pairs off free protons and off nucleons bound…
Measurement of the (, ) reaction using a novel nucleon spin polarimeter
D. P. Watts, D. I. Glazier, P. Aguar-Bartolomé +74
We report the first large-acceptance measurement of polarization transfer from a polarized photon beam to a recoiling nucleon, pioneering a novel polarimetry technique with wide ap…
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…
A new measurement of the rare decay eta -> pi^0 gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron
B. M. K. Nefkens, S. Prakhov, P. Aguar-Bartolomé +76
A new measurement of the rare, doubly radiative decay eta->pi^0 gamma gamma was conducted with the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging…
The LUX-ZEPLIN (LZ) radioactivity and cleanliness control programs
D. S. Akerib, C. W. Akerlof, D. Yu. Akimov +387
LUX-ZEPLIN (LZ) is a second-generation direct dark matter experiment with spin-independent WIMP-nucleon scattering sensitivity above cm for a WIMP mass…
Photoproduction ofeta-pi pairs off nucleons and deuterons
A. Kaeser, F. Mueller, J. Ahrens +66
Quasi-free photoproduction of -pairs has been investigated from threshold up to incident photon energies of 1.4 GeV, respectively up to photon-nucleon invariant masses up to…
Spin polarizabilities of the proton by measurement of Compton double-polarization observables
D. Paudyal, P. P. Martel, G. M. Huber +90
The Compton double-polarization observable has been measured for the first time in the resonance region using a circularly polarized photon beam incident on a…
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 $^…
Quasifree photoproduction of mesons off protons and neutrons
A2 Collaboration, D. Werthmüller, L. Witthauer +72
Differential and total cross sections for the quasifree reactions and have been determined at the MAMI-C electron accelerator using a liquid…
Insight into the narrow structure in {\boldmath{}}-photoproduction on the neutron from helicity dependent cross sections
L. Witthauer, M. Dieterle, S. Abt +83
The double polarization observable and the helicity dependent cross sections and were measured for photoproduction from quasi-free protons and neutro…
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…
Probing hard/soft factorization via beam-spin asymmetry in exclusive pion electroproduction from the proton
Alicia C. Postuma, Garth M. Huber, D. J. Gaskell +76
Deep exclusive meson production (DEMP) reactions, such as , provide opportunities to study the three-dimensional structure of the nucleon through differential c…
Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)
E. F. McNicoll, S. Prakhov, I. I. Strakovsky +81
The gp-->etap reaction has been measured with the Crystal Ball and TAPS multiphoton spectrometers in the energy range from the production threshold of 707 MeV to 1.4 GeV (1.49 =< W…
Photon asymmetry measurements of for E=320650 MeV
S. Gardner, D. Howdle, M. H. Sikora +97
High statistics measurements of the photon asymmetry for the pp reaction have been made in the center of mass energy range W=1214-…
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…
Helicity-dependent cross sections and double-polarization observable E in eta photoproduction from quasi-free protons and neutrons
L. Witthauer, M. Dieterle, S. Abt +84
Precise helicity-dependent cross sections and the double-polarization observable were measured for photoproduction from quasi-free protons and neutrons bound in the deuter…
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…
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…
Convection in a volatile nitrogen-ice-rich layer drives Pluto's geological vigor
William B. McKinnon, Francis Nimmo, Teresa Wong +61
The vast, deep, volatile-ice-filled basin informally named Sputnik Planum is central to Pluto's geological activity[1,2]. Composed of molecular nitrogen, methane, and carbon monoxi…
Old open clusters: UBGVRI photometry of NGC 2506
G. Marconi, D. Hamilton, M. Tosi +1
UBGVRI photometry for the open cluster NGC 2506 is presented. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we der…
The isospin structure of photoproduction of pi-eta pairs from the nucleon in the threshold region
A. Käser, J. Ahrens, J. R. M. Annand +71
Photoproduction of -pairs from nucleons has been investigated from threshold up to incident photon energies of ~1.4~GeV. The quasi-free reactions $γp\rightarrow pυ
Deep exclusive electroproduction of at high in the quark valence regime
The Jefferson Lab Hall A Collaboration, M. Dlamini, B. Karki +159
We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of (0.36, 0.48 and 0.60) and (3.1 to 8.4 GeV) obtai…
Photoproduction of pi0-mesons off neutrons in the nucleon resonance region
M. Dieterle, I. Keshelashvili, J. Ahrens +71
Precise angular distributions have been measured for the first time for the photoproduction of -mesons off neutrons bound in the deuteron. The effects from nuclear Fermi mo…
Time- and energy-resolved effects in the boron-10 based Multi-Grid and helium-3 based thermal neutron detectors
A. Backis, A. Khaplanov, R. Al Jebali +33
The boron-10 based Multi-Grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for ti…
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…
A narrow structure in the excitation function of eta-photoproduction off the neutron
D. Werthmueller, L. Witthauer, I. Keshelashvili +69
The photoproduction of -mesons off nucleons bound in H and He has been measured in coincidence with recoil protons and recoil neutrons for incident photon energies from…
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…
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…