Measurements of atomic recombination in the HERMES polarized hydrogen and deuterium storage cell target

Baumgarten, C.; Braun, B.; Court, G.R.; Ciullo, G.; Dalpiaz, P.; Golendukhin, A.; Graw, G.; Haeberli, W.; Henoch, M.; Hertenberger, R.; Koch, Norbert; Kolster, H.; Lenisa, P.; Nass, A.; Pod'yachev, S.P.; Reggiani, D.; Rith, Klaus; Steffens, E.; Stewart, J.; Wise, T.

doi:10.1016/s0168-9002(02)01750-3

Cited by 17 publications

(4 citation statements)

References 19 publications

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“…The usage of a pure target avoids the complications of nuclear corrections present in previous measurements. The openended target cell was fed by an atomic-beam source [18] based on Stern-Gerlach separation combined with radiofrequency transitions between hydrogen hyperfine states. The nuclear polarization of the atoms was flipped at 1-3 minute time intervals, while both the polarization magnitude and the atomic fraction inside the target cell were continuously measured [19].…”

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confidence: 99%

Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

Airapetian,

Akopov,

Akopov

et al. 2011

Preprint

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A measurement of the virtual-photon asymmetry A2(x, Q 2 ) and of the spin-structure function g2(x, Q 2 ) of the proton are presented for the kinematic range 0.004 < x < 0.9 and 0.18 GeV 2 < Q 2 < 20 GeV 2 . The data were collected by the HERMES experiment at the HERA storage ring at DESY while studying inclusive deep-inelastic scattering of 27.6 GeV longitudinally polarized leptons off a transversely polarized hydrogen gas target. The results are consistent with previous experimental data from CERN and SLAC. For the x-range covered, the measured integral of g2(x) converges to the null result of the Burkhardt-Cottingham sum rule. The x 2 moment of the twist-3 contribution to g2(x) is found to be compatible with zero.

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mentioning

confidence: 99%

Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

Airapetian,

Akopov,

Akopov

et al. 2011

Preprint

Self Cite

View full text Add to dashboard Cite

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“…The open-ended target cell is fed by an atomic-beam source based on Stern-Gerlach separation [3] with hyperfine transitions. The nuclear polarization of the atoms is randomly chosen at 90 s time intervals, while both this polarization and the atomic fraction inside the target cell are continu-ously measured [4,5]. Scattered beam leptons and coincident hadrons are detected by the HERMES spectrometer [6].…”

Section: Methodsmentioning

confidence: 99%

Measurement of ΔS in the Nucleon from Semi-inclusive DIS on Deuterium

Jackson¹

2007

AIP Conference Proceedings

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The helicity density of the strange quark sea in the nucleon has been extracted from measurements of semi-inclusive polarized deep-inelastic scattering on the deuteron. In the region of measurement the helicity density is zero within experimental error, and in a leading-order analysis the integral of the density over the region x > 0.02 is determined to be 0.006±0.029(stat.)±0.007(sys.). The first moment of the axial charge over the same region is substantially less than that inferred from hyperon-semi-leptonic decays.

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“…The open-ended target cell is fed by an atomic-beam source based on Stern-Gerlach separation [4] with hyperfine transitions. The nuclear polarization of the atoms is flipped at 90 s time intervals, while both this polarization and the atomic fraction inside the target cell are continuously measured [5,6]. Scattered beam leptons and coincident hadrons are detected by the HERMES spectrometer [7].…”

Section: The Experimentsmentioning

confidence: 99%

Measurement of ΔS in the nucleon at HERMES from semi-inclusive DIS

Jackson

2006

AIP Conference Proceedings

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The helicity density of the strange quark sea in the proton has been extracted from measurements of polarized semi-inclusive production of charged kaons in deep-inelastic scattering of positrons from a polarized deuteron target. In the region of measurement of x > 0.02 the helicity density is zero within experimental error and the measured first moment of the density is 0.006±0.029(stat.)±0.007(sys.). The first moment of the axial charge in the measured region is substantially less than that inferred from hyperon semi-leptonic decays.

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Measurements of atomic recombination in the HERMES polarized hydrogen and deuterium storage cell target

Cited by 17 publications

References 19 publications

Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

Measurement of ΔS in the Nucleon from Semi-inclusive DIS on Deuterium

Measurement of ΔS in the nucleon at HERMES from semi-inclusive DIS

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