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Showing 1 to 20 of 22 for “"Liquid-Hydrogen-Target"”.
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Production of Neutral D (1863) Mesons in 217 Gev/c Negative Pion Proton Interactions
… A 217 Gev (pi)('-) beam was incident on a liquid hydrogen target. The trigger required a slow recoil proton in coincidence with a muon. A total of 26 (+OR-) 8 neutral D mesons were observed through their KO(pi)('+)(pi)('-) decay mode. The distributions of Feynman X, missing mass, and …
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Backward resonance production in pi minus plus proton goes to neutron pi plus pi minus at 8 GeV/c
… using an 8 GeV/c n beam that was focussed on a liquid hydrogen target located inside the University of Il1inois~Argonne National Laboratory streamer chamber. The chamber was triggered on the interaction of a fast, forward neutral hadron in thick plate optical spark chambers. A total of 866 …
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Observation of quasi two-body production in pion plus proton goes to neutron plus four charged pions at 8 geV/c
… using an 8 GeV/a pion beam incident on a liquid hydrogen target inside the University of Illinois/Argonne National Laboratory streamer chamber. The chamber was triggered by the interaction of a fast, forward neutral hadron in thick plate optical spark chambers. Total backward cross …
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Measurement of Pion-Pion Final State Interactions in η → π +π −γ with CLAS at Jefferson Lab
… with energy range of 1.5-3.5 GeV incident on a liquid Hydrogen target. Our results are in agreement with the latest experimental measurement and theoretical calculations</p>
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DIRECT DETERMINATION OF THE WEAK CHARGE OF THE PROTON VIA PARITY-VIOLATING ELECTRON SCATTERING
… polarized electron beam was scattered by a liquid hydrogen target. The spin direction of the electron beam was switched between left and right helicity states. The cross section under both of the electron states were measured to form the parity-violating asymmetry. An asymmetry of …
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Measurement of the Photon Beam Asymmetry in <i>γP</i> → <i>K</i><sup>+</sup>Σ<sup>0</sup> at <i>E<sub>γ</sub></i> = 8.5 GeV with GlueX
… the energy range (8.2 - 8.8) GeV incident on a liquid hydrogen target. The beam asymmetries are measured as a function of the Mandelstam variable<em> t</em> and as a single value for the low <em>u</em> region. These are the first exclusive measurements of the photon beam asymmetry Σ in this …
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Instrument Design Optimization with Computational Methods
… time dependence of density fluctuations from the liquid hydrogen (LH2) target used in the <em>Q<sub>weak</sub></em> experiment (2011-2012) are studied with Computational Fluid Dynamics (CFD) and the simulation results compared to data from the experiment. The 2.5 kW liquid hydrogen target was the …
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Measurement of Virtual Compton Scattering Below Pion Threshold at Invariant Four-Momentum Transfer Squared Q²=1.(GEV/C)²
… of electroproduction of photons off a cryogenic liquid Hydrogen target. Data were collected in Hall A at Jefferson Lab between March and April 1998 below pion threshold at Q<sup>2</sup> = 1. and 1.9 (GeV/c)<sup>2</sup> and also in the resonance region. Both the scattered electron and the recoil …
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Measurement of the Deeply Virtual Compton Scattering Cross Section from the Proton at 10.6 GeV using the CLAS12 Detector
… be probed and three-dimensional images of the target nucleon or nucleus can be realized. This thesis presents a cross section analysis of DVCS from the proton in the presence of its background, Bethe-Heitler (BH) process. The CEBAF Large Acceptance Spectrometer for operation at 12 GeV beam …
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Precision Measurement of the Proton's Weak Charge using Parity-Violating Electron Scattering
… polarized electrons at 1.16 GeV scattered off a liquid hydrogen target of unpolarized protons. The electrons were collimated to an acceptance of 5.8◦ to 11.6◦ and then passed through a magnetic spectrometer and onto quartz Čerenkov detector bars. A detailed description of the theory and …
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Measurement of the Beam Asymmetry for the ETA and ETA Prime Mesons with the Gluex Experiment
… a linearly-polarized photon beam incident on a liquid hydrogen target and a nearly-four-pi hermetic detector capable of measuring positions and momenta of both charged and neutral final state particles generated in the target. The short-term physics goals of GlueX are to measure observables and …
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Recoil polarization measurements of the proton electromagnetic form factor ratio to high momentum transfer
… A polarized electron beam was scattered from a liquid hydrogen target, transferring polarization to the recoiling protons. These protons were detected in a magnetic spectrometer which was used to reconstruct their kinematics, including their scattering angles and momenta, and the position of the …
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First determination of the weak charge of the proton
… electron beam of 1.165 GeV and a 34.4 cm liquid hydrogen target in experimental Hall C at Jefferson Lab. As the Q² at the Qweak experiment is much lower than all previous experiments, the Qweak measurement can be considered as the first direct determination of the weak charge of the …
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Photoproduction of π0 on Hydrogen With CLAS From 1.1 GeV - 5.45 GeV Using e+e –γ Decay
… - 5.45 GeV. The measurement is performed on a liquid hydrogen target in the reaction γ<em>p</em> → <em>pe</em> <sup>+</sup><em>e</em><sup>–</sup>(γ). The final state of the reaction is the sum of two subprocesses for π<sup>0</sup> decay, the Dalitz decay mode of π<sup>0</sup> → <em>e</em> …
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Search for pentaquark partners [Theta]⁺⁺, [Sigma]⁰ and N⁰ in H (e,e'K [pi])) X reactions at Jefferson Lab Hall A
… Lab using a 5 GeV electron beam incident on a liquid hydrogen target. The two high resolution magnetic spectrometers were coupled to septum magnets to allow measurement of scattered electrons and outgoing hadrons at angles as small as 6 degrees. The missing mass resolution was determined to be …
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Photoproduction and Radiative Decay of ηt Meson in CLAS at JLAB
… - 2.72 GeV. The measurements are performed on a liquid hydrogen target in the reaction <em>γp → pη</em><em>/</em>(<em>η</em><em>/ </em><em>→ π</em>+<em>π</em><em>−</em><em>γ</em>). The analysis is based on the highest statistics collected in this decay channel in comparison to other experiments …
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Measurements of Compton Scattering on the Proton at 2--6 GeV
… a bremsstrahlung photon beam), the Hall A liquid hydrogen target, a high resolution spectrometer with a focal plane polarimeter, and a photon hodoscope calorimeter. Results of the differential cross sections are presented, and discussed in the general context of the scientific motivation."
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Measurements of Compton scattering on the proton at 2-6 GeV
… a bremsstrahlung photon beam), the Hall A liquid hydrogen target, a high resolution spectrometer with a focal plane polarimeter, and a photon hodoscope calorimeter. Results of the differential cross sections are presented, and discussed in the general context of the scientific motivation.
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Precision measurement of the weak charge of the proton and parity violation in the N → ∆ transition
… scattering off the unpolarized photons in the liquid hydrogen target, a value of Q<sub>w</sub><sup>p</sup> (PVES) = 0.0719 ± 0.0045 was determined. The Standard Model has a definite prediction of Q<sub>w</sub><sup>p</sup> (SM) = 0.0708 ± 0.0003, consistent with the value determined by …
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Direct Measurements of Two Photon Exchange on Lepton-Proton Elastic Scattering Using Simultaneous Electron-Positron Beams in CLAS
… e</em>- beam which then interacted with a liquid hydrogen target. The <em>e</em>+<em>p</em> and <em>e</em>-<em>p</em> events were detected by the CLAS (CEBAF Large Acceptance Spectrometer). The elastic cross section ratios ((σ(<em> e</em>+<em>p</em>)/(σ(<em>e</em> -<em>p</em>)) were …
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