Donal B. Day
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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: Inclusive studies of two- and three-nucleon short-range correlations in 3H and 3He
Inclusive studies of two- and three-nucleon short-range correlations in 3H and 3He Open
Inclusive electron scattering at carefully chosen kinematics can isolate scattering from the high-momentum nucleons in short-range correlations (SRCs). SRCs are produced by the hard, short-distance interactions of nucleons in the nucleus, …
View article: Measuring short-range correlations and quasi-elastic cross sections in A(e,e') at x>1 and modest Q$^2$
Measuring short-range correlations and quasi-elastic cross sections in A(e,e') at x>1 and modest Q$^2$ Open
We present results from the Jefferson Lab E08-014 experiment, investigating short-range correlations (SRC) through measurements of absolute inclusive quasi-elastic cross sections and their ratios. This study utilized 3.356 GeV electrons sc…
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: 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: Strong interaction physics at the luminosity frontier with 22 GeV electrons at Jefferson Lab
Strong interaction physics at the luminosity frontier with 22 GeV electrons at Jefferson Lab Open
View article: Inclusive studies of two- and three-nucleon short-range correlations in $^3$H and $^3$He
Inclusive studies of two- and three-nucleon short-range correlations in $^3$H and $^3$He Open
Inclusive electron scattering at carefully chosen kinematics can isolate scattering from the high-momentum nucleons in short-range correlations (SRCs). SRCs are produced by the hard, short-distance interactions of nucleons in the nucleus, …
View article: Novel Measurement of the Neutron Magnetic Form Factor from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">A</mml:mi><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:math> Mirror Nuclei
Novel Measurement of the Neutron Magnetic Form Factor from Mirror Nuclei Open
The electromagnetic form factors of the proton and neutron encode information on the spatial structure of their charge and magnetization distributions. While measurements of the proton are relatively straightforward, the lack of a free neu…
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
Quasi-elastic scattering on 12C(e,e'p) was measured in Hall C at Jefferson Lab for space-like 4-momentum transfer squared Q2 in the range of 8-14.2 (GeV/c)2 with proton momenta up to 8.3 GeV/c. Here the exp…
View article: Letter of Intent for a Drell-Yan experiment with a polarized proton target
Letter of Intent for a Drell-Yan experiment with a polarized proton target Open
It is well known that the proton is a spin-1/2 particle, but how the constituents (quarks and gluons) assemble to this quantized spin is still a mystery. There is a worldwide effort to map out the individual contributions to the proton spi…
View article: A novel measurement of the neutron magnetic form factor from A=3 mirror nuclei
A novel measurement of the neutron magnetic form factor from A=3 mirror nuclei Open
The electromagnetic form factors of the proton and neutron encode information on the spatial structure of their charge and magnetization distributions. While measurements of the proton are relatively straightforward, the lack of a free neu…
View article: Determination of the titanium spectral function from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>e</mml:mi><mml:mo>,</mml:mo><mml:mtext> </mml:mtext><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup><mml:mi>p</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> data
Determination of the titanium spectral function from data Open
The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the (e, e'p) cross section in parallel kinematics using a natural titanium target. In this paper, we report the analysis of the dataset obtained in different kinema…
View article: Toward observation of three-nucleon short-range correlations in high-<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:mo> </mml:mo><mml:mrow><mml:mi>A</mml:mi><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:mo>)</mml:mo><mml:mi>X</mml:mi></mml:mrow></mml:math> reactions
Toward observation of three-nucleon short-range correlations in high- reactions Open
Here, we present a detailed study of the kinematical and dynamical conditions necessary for probing highly elusive three-nucleon short-range correlations (3N-SRCs) in nuclei through inclusive electron scattering. The kinematic requirements…
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: Revealing the short-range structure of the mirror nuclei 3H and 3He
Revealing the short-range structure of the mirror nuclei 3H and 3He Open
View article: Probing for high-momentum protons in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts/><mml:none/><mml:mn>4</mml:mn></mml:mmultiscripts></mml:math> via the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts/><mml:none/><mml:mn>4</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:mi>X</mml:mi></mml:mrow></mml:math> reactions
Probing for high-momentum protons in via the reactions Open
Experimental cross sections for the He-4(e, e'p)X reactions in the missing energy range from 0.017 to 0.022 GeV and up to a missing momentum of 0.632 GeV/c at x(B) = 1.24 and Q(2) = 2 (GeV/c)(2) are reported. The data are compared to relat…
View article: Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:msub><mml:mi>σ</mml:mi><mml:mi>L</mml:mi></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi>σ</mml:mi><mml:mi>T</mml:mi></mml:msub></mml:mrow></mml:math> and the separated longitudinal and transverse structure functions in the nucleon-resonance region
Measurement of and the separated longitudinal and transverse structure functions in the nucleon-resonance region Open
We report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C in the four-momentum transfer range 0.2
View article: Determination of the argon spectral function from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">(</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 stretchy="false">)</mml:mo></mml:math> data
Determination of the argon spectral function from data Open
The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the $(e, e'p)$ cross section in parallel kinematics using a natural argon target. Here, we report the full results of the analysis of the data set corresponding to …
View article: Constraints on the onset of color transparency from quasi-elastic $^{12}$C$(e,e'p)$ up to $Q^2=\,14.2\,$(GeV$/c)^2$
Constraints on the onset of color transparency from quasi-elastic $^{12}$C$(e,e'p)$ up to $Q^2=\,14.2\,$(GeV$/c)^2$ Open
Quasi-elastic scattering on $^{12}$C$(e,e'p)$ was measured in Hall C at Jefferson Lab for space-like 4-momentum transfer squared $Q^2$ in the range of 8--14.2\,(GeV/$c$)$^2$ with proton momenta up to 8.3\,GeV/$c$. The experiment was carrie…
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: Deeply virtual Compton scattering using a positron beam in Hall-C at Jefferson Lab
Deeply virtual Compton scattering using a positron beam in Hall-C at Jefferson Lab Open
View article: An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab
An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab Open
View article: Deeply virtual Compton scattering using a positron beam in Hall-C at\n Jefferson Lab
Deeply virtual Compton scattering using a positron beam in Hall-C at\n Jefferson Lab Open
We propose to use the High Momentum Spectrometer of Hall C combined with the\nNeutral Particle Spectrometer (NPS) to perform high precision measurements of\nthe Deeply Virtual Compton Scattering (DVCS) cross section using a beam of\npositr…
View article: Measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">Ar</mml:mi><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> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">Ti</mml:mi><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> cross sections in Jefferson Lab Hall A
Measurement of the and cross sections in Jefferson Lab Hall A Open
The E12-14-012 experiment, performed in Jefferson Lab Hall A, has collected exclusive electron-scattering data (e,e'p) in parallel kinematics using natural argon and natural titanium targets. In this study we report the first results of th…
Ruling out Color Transparency in Quasielastic up to of Open
View article: An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab
An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab Open
Positron beams, both polarized and unpolarized, are identified as important ingredients for the experimental programs at the next generation of lepton accelerators. In the context of the hadronic physics program at Jefferson Lab (JLab), po…
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: Novel observation of isospin structure of short-range correlations in calcium isotopes
Novel observation of isospin structure of short-range correlations in calcium isotopes Open
Short Range Correlations (SRCs) have been identiffed as being responsible for the high momentum tail of the nucleon momentum distribution, n(k). Hard, short-range interactions of nucleon pairs generate the high momentum tail and imprint a …
View article: Strange Hadron Spectroscopy with Secondary KL Beam in Hall D
Strange Hadron Spectroscopy with Secondary KL Beam in Hall D Open
We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab to be used with the GlueX experimental setup for strange hadron spectroscopy. The superior CEBAF electron beam will enable a flux on the order of $1\times 10…