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Hansen, J. O.; Titko, M. A.; DeSchepper, D.; Dodson, G.; Donnelly, T. W.; Ent, K. Dow R.; Farkhondeh, M.; Korsch, W.; Kramer, L.; Lee, K.; Makins, N.; Milner, R.; Tieger, D.; Welch, T. P.; Jones, C. E.; Arrington, J.; Beise, E. J.; Bray, B.; Carr, R.; Filippone, B. W.; H, Gao; Lung, A.; McKeown, R. D.; Mueller, B.; Pitt, M. L.; Schulze, R.; Sauer, P.U.; Candell, E.; Napolitano, J.; Tripp, C.; Wojtsekhowski, B.; Lorenzon, W.

doi:10.1103/physrevlett.74.654

Cited by 21 publications

(6 citation statements)

References 32 publications

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“…[2], [3], [4] [5] and [6]), in this work our focus is on inclusive scattering with polarization degrees of freedom. Most such studies have been restricted to 2 H and 3 He, and include recent experimental asymmetry measurements [7,8]; however, in this paper we restrict our attention entirely to polarization observables in (inclusive) quasielastic electron scattering from medium and heavy nuclei.…”

Section: Introductionmentioning

confidence: 99%

Inclusive quasielastic scattering of polarized electrons from polarized nuclei

Amaro¹,

Caballero²,

Donnelly³

et al. 1996

Nuclear Physics A

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The inclusive quasielastic response functions that appear in the scattering of polarized electrons from polarized nuclei are computed and analyzed for several closed-shell-minus-one nuclei with special attention paid to 39 K. Results are presented using two models for the ejected nucleon | when described by a distorted wave in the continuum shell model or by a plane wave in PWIA with on-and o-shell nucleons. Relativistic eects in kinematics and in the electromagnetic current h a v e been incorporated throughout. Specically, the recently obtained expansion of the electromagnetic current in powers only of the struck nucleon's momentum is employed for the on-shell current and the eects of the rst-order terms (spin-orbit and convection) are compared with the zeroth-order (charge and magnetization) contributions. The use of polarized inclusive quasielastic electron scattering as a tool for determining near-valence nucleon momentum distributions is discussed.

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Section: Introductionmentioning

confidence: 99%

Inclusive quasielastic scattering of polarized electrons from polarized nuclei

Amaro¹,

Caballero²,

Donnelly³

et al. 1996

Nuclear Physics A

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“…The 10 cm long copper target cell was coated with frozen nitrogen to permit target cell relaxation times between 400 s and 1000 s, depending on beam current. The same target design was employed in subsequent experiments to determine the neutron’s magnetic form factor (Gao et al , 1994) and to further study quasielastic scattering (Hansen et al , 1995). Employing optical pumping with a few watts of laser light from a Nd:LMA laser (Gentile and McKeown, 1993) allowed for over 38 % 3 He polarization at 2.5 times higher average electron beam current (Gao et al , 1994).…”

Section: Charged Particle and Photon Scattering Targetsmentioning

confidence: 99%

Optically polarizedHe3

et al. 2017

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This article reviews the physics and technology of producing large quantities of highly spin-polarized 3He nuclei using spin-exchange (SEOP) and metastability-exchange (MEOP) optical pumping. Both technical developments and deeper understanding of the physical processes involved have led to substantial improvements in the capabilities of both methods. For SEOP, the use of spectrally narrowed lasers and K-Rb mixtures has substantially increased the achievable polarization and polarizing rate. For MEOP nearly lossless compression allows for rapid production of polarized 3He and operation in high magnetic fields has likewise significantly increased the pressure at which this method can be performed, and revealed new phenomena. Both methods have benefitted from development of storage methods that allow for spin-relaxation times of hundreds of hours, and specialized precision methods for polarimetry. SEOP and MEOP are now widely applied for spin-polarized targets, neutron spin filters, magnetic resonance imaging, and precision measurements.

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“…However, these early measurements yielded statistical uncertainties comparable with the extracted quantity; the sources of theoretical uncertainties were not investigated. In a later measurement, better statistical precision was obtained, and an extensive analysis of the systematic uncertainties was performed [16]. In that analysis, the large variation in the asymmetry predictions revealed a large model uncertainty at low Q 2 .…”

Section: Introductionmentioning

confidence: 99%

Extraction of the neutron electric form factor from measurements of inclusive double spin asymmetries

Sulkosky¹,

Gao²,

Long³

et al. 2017

Phys. Rev. C

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Background: Measurements of the neutron charge form factor, G n E , are challenging due to the fact that the neutron has no net charge. In addition, measurements of the neutron form factors must use nuclear targets which require accurately accounting for nuclear effects. Extracting G n E with different targets and techniques provides an important test of our handling of these effects.Purpose: The goal of the measurement was to use an inclusive asymmetry measurement technique to extract the neutron charge form factor at a four-momentum transfer of 1 (GeV/c) 2 . This technique has very different arXiv:1704.06253v2 [nucl-ex] 28 Nov 2017 systematic uncertainties than traditional exclusive measurements and thus serves as an independent check of whether nuclear effects have been taken into account correctly.Method: The inclusive quasi-elastic reaction 3 − → He( − → e , e ) was measured at Jefferson Lab. The neutron electric form factor, G n E , was extracted at Q 2 = 0.98 (GeV/c) 2 from ratios of electron-polarization asymmetries measured for two orthogonal target spin orientations. This Q 2 is high enough that the sensitivity to G n E is not overwhelmed by the neutron magnetic contribution, and yet low enough that explicit neutron detection is not required to suppress pion production.Results: The neutron electric form factor, G n E , was determined to be 0.0414 ± 0.0077 (stat) ± 0.0022 (syst); providing the first high precision inclusive extraction of the neutron's charge form factor. Conclusions:The use of the inclusive quasi-elastic 3 − → He( − → e , e ) with a four-momentum transfer near 1 (GeV/c) 2 has been used to provide a unique measurement of G n E . This new result provides a systematically independent validation of the exclusive extraction technique results and implies that the nuclear corrections are understood. This is contrary to the proton form factor where asymmetry and cross-section measurements have been shown to have large systematic differences.

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Transverse-Longitudinal Asymmetry in the QuasielasticHe→3(e→

Cited by 21 publications

References 32 publications

Inclusive quasielastic scattering of polarized electrons from polarized nuclei

Inclusive quasielastic scattering of polarized electrons from polarized nuclei

Optically polarizedHe3

Extraction of the neutron electric form factor from measurements of inclusive double spin asymmetries

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