8 research outputs found
Constraints on the Onset of Color Transparency from Quasielastic ¹²C(e, e′p) up to Q² = (14.2 GeV /c)²
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 Hall C at Jefferson Lab. It used the existing high-momentum spectrometer and the new super-high-momentum spectrometer to detect the scattered electrons and protons in coincidence. The nuclear transparency was extracted as the ratio of the measured yield to the yield calculated in the plane wave impulse approximation. Additionally, the transparency of the 1s1/2 and 1p3/2 shell protons in 12C was extracted, and the asymmetry of the missing momentum distribution was examined for hints of the quantum chromodynamics prediction of color transparency. All of these results were found to be consistent with traditional nuclear physics and inconsistent with the onset of color transparency
First Measurement of the EMC Effect in B and B
The nuclear dependence of the inclusive inelastic electron scattering cross
section (the EMC effect) has been measured for the first time in B and
B. Previous measurements of the EMC effect in nuclei showed
an unexpected nuclear dependence; B and B were measured to
explore the EMC effect in this region in more detail. Results are presented for
Be, B, B, and C at an incident beam energy of
10.6~GeV. The EMC effect in the boron isotopes was found to be similar to that
for Be and C, yielding almost no nuclear dependence in the EMC
effect in the range . This represents important, new data supporting
the hypothesis that the EMC effect depends primarily on the local nuclear
environment due to the cluster structure of these nuclei.Comment: Submitted to PR
First Measurement of the EMC effect in ¹⁰B and ¹¹B
The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in 10B and 11B. Previous measurements of the EMC effect in A ≤ 12 nuclei showed an unexpected nuclear dependence; 10B and 11B were measured to explore the EMC effect in this region in more detail. Results are presented for 9Be, 10B, 11B, and 12C at an incident beam energy of 10.6 GeV. The EMC effect in the boron isotopes was found to be similar to that for 9Be and 12C, yielding almost no nuclear dependence in the EMC effect in the range A = 4–12. This represents important new data supporting the hypothesis that the EMC effect depends primarily on the local nuclear environment due to the cluster structure of these nuclei
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First Measurement of the EMC effect in B10 and B11
The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in B10 and B11. Previous measurements of the EMC effect in A≤12 nuclei showed an unexpected nuclear dependence; B10 and B11 were measured to explore the EMC effect in this region in more detail. Results are presented for Be9, B10, B11, and C12 at an incident beam energy of 10.6 GeV. The EMC effect in the boron isotopes was found to be similar to that for Be9 and C12, yielding almost no nuclear dependence in the EMC effect in the range A=4-12. This represents important new data supporting the hypothesis that the EMC effect depends primarily on the local nuclear environment due to the cluster structure of these nuclei
First Measurement of the EMC Effect in B and B
International audienceThe nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in B and B. Previous measurements of the EMC effect in nuclei showed an unexpected nuclear dependence; B and B were measured to explore the EMC effect in this region in more detail. Results are presented for Be, B, B, and C at an incident beam energy of 10.6~GeV. The EMC effect in the boron isotopes was found to be similar to that for Be and C, yielding almost no nuclear dependence in the EMC effect in the range . This represents important, new data supporting the hypothesis that the EMC effect depends primarily on the local nuclear environment due to the cluster structure of these nuclei
Constraints on the onset of color transparency from quasi-elastic C up to (GeV
International audienceQuasi-elastic scattering on C was measured in Hall C at Jefferson Lab for space-like 4-momentum transfer squared in the range of 8--14.2 (GeV/) with proton momenta up to 8.3 GeV/. The experiment was carried out in the upgraded Hall C at Jefferson Lab. It used the existing high momentum spectrometer and the new super high momentum spectrometer to detect the scattered electrons and protons in coincidence. The nuclear transparency was extracted as the ratio of the measured yield to the yield calculated in the plane wave impulse approximation. Additionally, the transparency of the and shell protons in C was extracted, and the asymmetry of the missing momentum distribution was examined for hints of the quantum chromodynamics prediction of Color Transparency. All of these results were found to be consistent with traditional nuclear physics and inconsistent with the onset of Color Transparency
First Measurement of the EMC effect in <math><mmultiscripts><mi mathvariant="normal">B</mi><mprescripts/><none/><mn>10</mn></mmultiscripts></math> and <math><mmultiscripts><mi mathvariant="normal">B</mi><mprescripts/><none/><mn>11</mn></mmultiscripts></math>
International audienceThe nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in B10 and B11. Previous measurements of the EMC effect in A≤12 nuclei showed an unexpected nuclear dependence; B10 and B11 were measured to explore the EMC effect in this region in more detail. Results are presented for Be9, B10, B11, and C12 at an incident beam energy of 10.6 GeV. The EMC effect in the boron isotopes was found to be similar to that for Be9 and C12, yielding almost no nuclear dependence in the EMC effect in the range A=4–12. This represents important new data supporting the hypothesis that the EMC effect depends primarily on the local nuclear environment due to the cluster structure of these nuclei
Ruling out Color Transparency in Quasielastic C(e,e'p) up to of 14.2 (GeV/c)
International audienceQuasielastic C12(e,e′p) scattering was measured at spacelike 4-momentum transfer squared Q2=8, 9.4, 11.4, and 14.2 (GeV/c)2, the highest ever achieved to date. Nuclear transparency for this reaction was extracted by comparing the measured yield to that expected from a plane-wave impulse approximation calculation without any final state interactions. The measured transparency was consistent with no Q2 dependence, up to proton momenta of 8.5 GeV/c, ruling out the quantum chromodynamics effect of color transparency at the measured Q2 scales in exclusive (e,e′p) reactions. These results impose strict constraints on models of color transparency for protons