Density changes in low pressure gas targets for electron scattering experiments

Santiesteban, S. N.; Alsalmi, S.; Meekins, D.; Gayoso, C. Ayerbe; Bane, J.; Barcus, S.; Campbell, J.; Castellanos, J. Castillo; Cruz-Torres, R.; Dai, Hongxia; Hague, T.; Hauenstein, F.; Higinbotham, D. W.; Holt, R. J.; Kutz, T.; Li, S.; Liu, Haibo; McClellan, R. E.; Nycz, M.; Nguyen, D.; Pandey, B.; Pandey, V.; Schmidt, Axel; Su, T.; Ye, Z.

doi:10.1016/j.nima.2019.06.025

Cited by 23 publications

(19 citation statements)

References 12 publications

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“…The experiment employed a set of solid targetsaluminum, carbon (single foil and a multi-foil composed of 9 foils), and titanium-as well as a closed cell of gaseous argon [13]. The aluminum target consisted of two identical foils of the 7075 alloy, the thickness of which was 0.889 ± 0.002 g/cm 2 .…”

Section: Methodsmentioning

confidence: 99%

Measurement of the cross sections for inclusive electron scattering in the E12-14-012 experiment at Jefferson Lab

Murphy¹,

Dai²,

Gu³

et al. 2019

Phys. Rev. C

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The E12-14-012 experiment performed at Jefferson Lab Hall A has collected inclusive electronscattering data for different targets at the kinematics corresponding to beam energy 2.222 GeV and scattering angle 15.54 • . Here we present a comprehensive analysis of the collected data, and perform comparisons of the double differential cross sections for inclusive scattering of electrons extracted using solid targets (aluminum, carbon, and titanium) and a closed argon-gas cell. The data cover a wide range of kinematic regimes, in which quasielastic interaction, ∆-resonance excitation, and deep-inelastic scattering contribute. The double differential cross sections are reported with high precision (∼3%) for all targets over the covered kinematic range.

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Section: Methodsmentioning

confidence: 99%

Measurement of the cross sections for inclusive electron scattering in the E12-14-012 experiment at Jefferson Lab

Murphy¹,

Dai²,

Gu³

et al. 2019

Phys. Rev. C

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“…The yields are normalized such that ( , ′ ) A (0 A) = 1. Additional information on the determination of these corrections, including the event-selection criteria, check of the methodology on a solid target, efficiency studies, and other details can be found in [109]. The corrections used in this analysis for the different gas targets at = 22.5 A are shown in Table 3.6.…”

Section: Density ('Boiling') Correctionsmentioning

confidence: 99%

“…The thickness is obtained by multiplying the gas density [mg/cm 3 ] by the target length (25 cm). See[107,109,110] for details.…”

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confidence: 99%

Two-Nucleon Short-Range Correlations in Light Nuclei

Torres

2020

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Understanding the nucleon-nucleon () interaction is a fundamental task in nuclear physics, as -interaction models are a crucial input to modern nuclear structure calculations. While great progress has been made toward understanding this interaction, the available state-of-the-art models predict significantly different behaviors at short distances and high momenta (scale-and-scheme dependence), where two-nucleon Short-Range Correlations (SRCs) dominate the nuclear wave function. Thus, SRCs are a unique tool to constrain the interaction and vice versa. SRCs are naturallyoccurring high-local-density pairs that, as a result of their short-distance ( 1 fm) repulsive interaction, fly apart with high momenta, hence populating momentum states above the Fermi level ( ≈ 250 MeV/ ). The study of SRCs also has significant implications for other fields, such as the astrophysics of neutron stars and the behavior of cold atomic gasses. This thesis describes experimental and phenomenological studies of the short-distance / high-momentum structure of the interaction through the study of SRCs and vice versa. Experimentally, I report the first measurement of the 3 He and 3 H( , ′ ) reactions in Hall A of the Thomas Jefferson National Accelerator Facility in kinematics in which the measured cross sections should be sensitive to the underlying nucleon momentum distributions in the range 40 to 500 MeV/ . The resulting cross-section ratios and absolute cross sections were compared to momentum-distribution ratios and precise cross-section calculations respectively. Phenomenologically, I report the generalization of the Contact Formalism (GCF) to nuclear systems, which exploits scale separation and universality to describe nucleons at short distances and high momenta.

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“…The experiment ran in 2018 in Hall A of the Thomas Jefferson National Accelerator Facility. It used the two highresolution spectrometers (HRSs) [23] and a 20 μA electron beam at 4.326 GeV incident on one of four identical 25-cmlong gas target cells filled with hydrogen (70.8AE0.4mg=cm 2 ), deuterium (142.2 AE 0.8 mg=cm 2 ), helium-3 (53.4AE 0.6 mg=cm 2 ), and tritium (85.1 AE 0.8 mg=cm 2 ) [24]. To minimize systematic uncertainties between measurements, the HRS were not moved when changing among the targets, which were installed on a linear motion target ladder.…”

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confidence: 99%

“…where C is the total accumulated beam charge, t is the live time fraction in which the detectors are able to collect data, A ¼ 3 is the target atomic mass, ρ is the nominal areal density of the gas in the target cell, and b is a correction factor to account for changes in the target density caused by local beam heating. b was determined by measuring the beam current dependence of the inclusive event yield [24]. V B is a factor that accounts for the detection phase space and acceptance correction for the given ðp miss ; E miss Þ bin and C Rad and C BM are the radiative and bin migration corrections, respectively.…”

mentioning

confidence: 99%