S. Malace
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View article: New Measurements of the Deuteron-to-Proton <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>F</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Structure-Function Ratio
New Measurements of the Deuteron-to-Proton Structure-Function Ratio Open
Nucleon structure functions, as measured in lepton-nucleon scattering, have historically provided a critical observable in the study of partonic dynamics within the nucleon. However, at very large parton momenta, it is both experimentally …
View article: The SHMS 11 GeV/c spectrometer in Hall C at Jefferson Lab
The SHMS 11 GeV/c spectrometer in Hall C at Jefferson Lab Open
View article: Investigation of Medium Modifications to $^{12}$C Structure Functions in the Resonance Region
Investigation of Medium Modifications to $^{12}$C Structure Functions in the Resonance Region Open
We present results from a high precision experimental study of the nuclear modification of the longitudinal ($F_L$) to transverse ($F_1$) structure function ratio for bound nucleons in the resonance region. The inclusive electron scatterin…
View article: Quasielastic $\overrightarrow{^{3}\mathrm{He}}(\overrightarrow{e},{e'})$ Asymmetry in the Threshold Region
Quasielastic $\overrightarrow{^{3}\mathrm{He}}(\overrightarrow{e},{e'})$ Asymmetry in the Threshold Region Open
A measurement of the double-spin asymmetry from electron-$^{3}$He scattering in the threshold region of two- and three-body breakup of $^{3}$He was performed at Jefferson Lab, for Q$^{2}$ values of 0.1 and 0.2 (GeV/$c$)$^{2}$. The results …
View article: New Measurements of the Deuteron to Proton F2 Structure Function Ratio
New Measurements of the Deuteron to Proton F2 Structure Function Ratio Open
Nucleon structure functions, as measured in lepton-nucleon scattering, have historically provided a critical observable in the study of partonic dynamics within the nucleon. However, at very large parton momenta it is both experimentally a…
View article: Pion electroproduction measurements in the nucleon resonance region
Pion electroproduction measurements in the nucleon resonance region Open
View article: Performance of a coarsely pixelated LAPPD photosensor for the SoLID gas Cherenkov detectors
Performance of a coarsely pixelated LAPPD photosensor for the SoLID gas Cherenkov detectors Open
The SoLID spectrometer's gas Cherenkov counters require photosensors that operate in a high luminosity and high background environment. The reference design features arrays of 9 or 16 tiled multi-anode photomultipliers (MaPMTs), distribute…
View article: Performance of a coarsely pixelated LAPPD photosensor for the SoLID gas Cherenkov detectors
Performance of a coarsely pixelated LAPPD photosensor for the SoLID gas Cherenkov detectors Open
The SoLID spectrometer's gas Cherenkov counters require photosensors that operate in a high luminosity and high background environment. The reference design features arrays of 9 or 16 tiled multi-anode photomultipliers (MaPMTs), distribute…
View article: IWNT 2009 (28th International Workshop on Nuclear Theory)
IWNT 2009 (28th International Workshop on Nuclear Theory) Open
Polarization transfer in quasi-elastic nucleon knockout is sensitive to the properties of the nucleon in the nuclear medium. In experiment E03-104 at Jefferson Lab we measured the proton recoil polarization in the 4He(e,e'p)3H reaction at …
View article: First Measurement of the EMC effect in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">B</mml:mi><mml:mprescripts/><mml:none/><mml:mn>10</mml:mn></mml:mmultiscripts></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">B</mml:mi><mml:mprescripts/><mml:none/><mml:mn>11</mml:mn></mml:mmultiscripts></mml:math>
First Measurement of the EMC effect in and Open
The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in $^{10}$B and $^{11}$B. Previous measurements of the EMC effect in $A \leq 12$ nuclei showed an une…
View article: Constraints on the onset of color transparency from quasielastic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">C</mml:mi><mml:mprescripts/><mml:none/><mml:mn>12</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>e</mml:mi><mml:mo>,</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mi>p</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> up to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>=</mml:mo><mml:mn>14.2</mml:mn><mml:mspace width="0.222222em"/><mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mi>GeV</mml:mi><mml:mo>/</mml:mo><mml:mi>c</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msup></mml:mrow></mml:math>
Constraints on the onset of color transparency from quasielastic up to Open
Quasielastic scattering on 12C(e,e′p) was measured in Hall C at Jefferson Lab for spacelike four-momentum transfer squared Q2 in the range of 8–14.2(GeV/c)2 with proton momenta up to 8.3GeV/c. The experiment was carried out in the upgraded…
View article: Towards robust PICOSEC Micromegas precise timing detectors
Towards robust PICOSEC Micromegas precise timing detectors Open
The PICOSEC Micromegas (MM) detector is a precise timing gaseous detector consisting of a Cherenkov radiator combined with a photocathode and a MM amplifying structure. A 100-channel PICOSEC MM prototype with 10 × 10 cm 2 active area equip…
View article: Large Area Picosecond PhotoDetector (LAPPD) definitive tests
Large Area Picosecond PhotoDetector (LAPPD) definitive tests Open
The goal of the project was to determine the optimal functional parameters for a new LAPPD, determine the cloud charge radius and test for gain variation due to pore sharing. Also, cosmics tests with C4F8 heavy gas of the new LAPPD were pl…
View article: Determining the gluonic gravitational form factors of the proton
Determining the gluonic gravitational form factors of the proton Open
View article: Measured proton electromagnetic structure deviates from theoretical predictions
Measured proton electromagnetic structure deviates from theoretical predictions Open
View article: Proton spin structure and generalized polarizabilities in the strong quantum chromodynamics regime
Proton spin structure and generalized polarizabilities in the strong quantum chromodynamics regime Open
View article: Deeply Virtual Compton Scattering Cross Section at High Bjorken <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>x</mml:mi></mml:mrow><mml:mrow><mml:mi>B</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Deeply Virtual Compton Scattering Cross Section at High Bjorken Open
We report high-precision measurements of the deeply virtual Compton scattering (DVCS) cross section at high values of the Bjorken variable x_{B}. DVCS is sensitive to the generalized parton distributions of the nucleon, which provide a thr…
View article: Deeply virtual Compton scattering cross section at high Bjorken $x_B$
Deeply virtual Compton scattering cross section at high Bjorken $x_B$ Open
We report high-precision measurements of the Deeply Virtual Compton Scattering (DVCS) cross section at high values of the Bjorken variable $x_B$. DVCS is sensitive to the Generalized Parton Distributions of the nucleon, which provide a thr…
View article: Measurement of the EMC effect in light and heavy nuclei
Measurement of the EMC effect in light and heavy nuclei Open
Inclusive electron scattering from nuclear targets has been measured to extract the nuclear dependence of the inelastic cross section in Hall C at the Thomas Jefferson National Accelerator facility. Results are presented for 2H, 3He, 4He, …
View article: Deep Exclusive Electroproduction of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> at High <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Q</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math> in the Quark Valence Regime
Deep Exclusive Electroproduction of at High in the Quark Valence Regime Open
We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of x_{B} (0.36, 0.48, and 0.60) and Q^{2} (3.1 to 8.4 GeV^{2}) obtained from Jefferson Lab Hall A experiment E12-06-014. The c…
View article: Single photoelectron identification with Incom LAPPD 38
Single photoelectron identification with Incom LAPPD 38 Open
Incom Inc. Large Area Picosecond Photodetector (LAPPD) 38 has been tested at Jefferson Lab to identify single-photoelectron signals to assess the potential of this type of device for future applications in Cherenkov light detection. Here, …
View article: Accurate Determination of the Neutron Skin Thickness of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Pb</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>208</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> through Parity-Violation in Electron Scattering
Accurate Determination of the Neutron Skin Thickness of through Parity-Violation in Electron Scattering Open
We report a precision measurement of the parity-violating asymmetry A_{PV} in the elastic scattering of longitudinally polarized electrons from ^{208}Pb. We measure A_{PV}=550±16(stat)±8(syst) parts per billion, leading to an extraction of…
Ruling out Color Transparency in Quasielastic up to of Open
View article: Probing the Deuteron at Very Large Internal Momenta
Probing the Deuteron at Very Large Internal Momenta Open
We measure ^{2}H(e,e^{'}p)n cross sections at 4-momentum transfers of Q^{2}=4.5±0.5 (GeV/c)^{2} over a range of neutron recoil momenta p_{r}, reaching up to ∼1.0 GeV/c. We obtain data at fixed neutron recoil angles θ_{nq}=35°, 45°, and 75°…
View article: Measurements of Nonsinglet Moments of the Nucleon Structure Functions and Comparison to Predictions from Lattice QCD for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Q</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup><mml:mo>=</mml:mo><mml:mn>4</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:msup><mml:mrow><mml:mi>GeV</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>
Measurements of Nonsinglet Moments of the Nucleon Structure Functions and Comparison to Predictions from Lattice QCD for Open
We present extractions of the nucleon nonsinglet moments utilizing new precision data on the deuteron F_{2} structure function at large Bjorken-x determined via the Rosenbluth separation technique at Jefferson Lab Experimental Hall C. Thes…
View article: Measurements of the separated longitudinal structure function <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>F</mml:mi><mml:mi>L</mml:mi></mml:msub></mml:math> from hydrogen and deuterium targets at low <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>
Measurements of the separated longitudinal structure function from hydrogen and deuterium targets at low Open
Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful in studying the partonic dynamics within the nucleon. However, it is experimentally difficult to separately determine the longitudinal and transve…