First measurement of the electric formfactor of the neutron in the exclusive quasielastic scattering of polarized electrons from polarized 3He

Meyerhoff, M.; Eyl, D.; Frey, A.; Andresen, H. G.; Annand, J. R. M.; Aulenbacher, K.; Becker, Jan; Blume–Werry, J.; Dombo, Th.; Drescher, P.; Ducret, J.E.; Fischer, H.; Grabmayr, P.; Hall, S.J.; Hartmann, Péter; Hehl, T.; Heil, W.; Hoffmann, J.; Kellie, J. D.; Клейн, Ф.; Leduc, Michèle; Möller, Hans; Nachtigall, Ch.; Ostrick, M.; Otten, Ernst W.; Owens, R.O.; Plützer, S.; Reichert, E.; Rohe, D.; Schäfer, Markus; Schearer, L. D.; Schmieden, H.; Steffens, K.; Surkau, R.; Walcher, Th.

doi:10.1016/0370-2693(94)90718-8

Cited by 182 publications

(82 citation statements)

References 21 publications

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“…Starting in the early 1990's, the neutron electric FF G En has been obtained in several experiments at MAMI, by measuring the beam-target asymmetry in the exclusive quasi-elastic scattering of electrons from polarized 3 He in the 3 He( e, e ′ n)pp reaction [Mey94,Bec99,Roh99,Ber03]. All the G En data from polarization experiments are shown in Fig.…”

Section: Neutron Electric Form Factor Measurements With Polarization mentioning

confidence: 99%

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Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

474

583

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There has been much activity in the measurement of the elastic electromagnetic proton and neutron form factors in the last decade, and the quality of the data has been greatly improved by performing double polarization experiments, in comparison with previous unpolarized data. Here we review the experimental data base in view of the new results for the proton, and neutron, obtained at MIT-Bates, MAMI, and JLab. The rapid evolution of phenomenological models triggered by these high-precision experiments will be discussed, including the recent progress in the determination of the valence quark generalized parton distributions of the nucleon, as well as the steady rate of improvements made in the lattice QCD calculations.

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Section: Neutron Electric Form Factor Measurements With Polarization mentioning

confidence: 99%

“…18. In the first of these experiments, at MAMI, [Mey94], G En was obtained at Q 2 = 0.31 GeV 2 . In following experiments at MAMI, G En was extracted at Q 2 of 0.35 GeV 2 [Bec99] and 0.67 GeV 2 [Roh99, Ber03] using the same reaction.…”

Section: Neutron Electric Form Factor Measurements With Polarization mentioning

confidence: 99%

Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

474

583

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“…Following this initial study, two additional measurements employing the inclusive quasielastic 3HIe(e, e') reaction were carried out at MIT-Bates: a measurement of GE, at Q 2 = 0.2 (GeV/c) 2 was reported by Thompson et al [197] in 1992, and the first polarized measurement of GM, was reported by Gao et al [198] in 1994 at Q 2 = 0.19 (GeV/c) 2 . Further measurements of GMn employing the inclusive quasielastic 3 He(e, e') reaction were conducted at Jefferson Laboratory at Q 2 values ranging from 0.1 to 0.6 (GeV/c) 2 and reported by Xu et al [199,200] The first extraction of GEn from measurements of A 1 and All in exclusive quasielastic 3He(e, e'n) scattering was conducted at MAMI; this pilot experiment was conducted at Q 2 = 0.31 (GeV/c) 2 , and the results were reported by Meyerhoff et al [201] in 1994. Again, these results were not corrected for FSI, MEC, and IC; however, this …”

Section: Historical Overview Of Polarized Target Experimentsmentioning

confidence: 96%

“…2 [196] and Thompson et al [197]; in addition, the results of Meyerhoff et al [201] are omitted as these were not corrected for nuclear physics effects. It is readily apparent that, relative to our knowledge of the other nucleon form factors, GEn remains poorly determined.…”

Section: Neutron Form Factorsmentioning

confidence: 99%

The neutron electric form factor to Q² = 1.45 (GeV/c)²

Plaster¹

2004

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The nucleon elastic electromagnetic form factors are fundamental quantities needed for an understanding of nucleon and nuclear electromagnetic structure. The evolution of the Sachs electric and magnetic form factors with Q 2 , the square of the fourmomentum transfer, is related to the distribution of charge and magnetization within the nucleon. High precision measurements of the nucleon form factors are essential for stringent tests of our current theoretical understanding of confinement within the nucleon.Measurements of the neutron form factors, in particular, those of the neutron electric form factor, have been notoriously difficult due to the lack of a free neutron target and the vanishing integral charge of the neutron. Indeed, a precise measurement of the neutron electric form factor has eluded experimentalists for decades; however, with the advent of high duty-factor polarized electron beam facilities, experiments employing polarization degrees of freedom have finally yielded the first precise measurements of this fundamental quantity.Following a general overview of the experimental and theoretical status of the nucleon form factors, a detailed description of an experiment designed to extract the neutron electric form factor from measurements of the neutron's recoil polarization in quasielastic 2 H(e, e')lH scattering is presented. The experiment described here employed the Thomas Jefferson National Accelerator Facility's longitudinally polarized electron beam, a magnetic spectrometer for detection of the scattered electron, and a neutron polarimeter designed specifically for this experiment. Measurements were conducted at three Q 2 values of 0.45, 1.13, and 1.45 (GeV/c) 2 , and the final results extracted from an analysis of the data acquired in this experiment are reported and compared with recent theoretical predictions for the nucleon form factors. Next, I would like to thank those who I credit most for my development: Jim Kelly and Andrei Semenov. At times, I found Jim's extremely high standards and desire for rigor to be exasperating, especially during the development of our simulation code and discussions of formalism (e.g., the "dreaded" Wigner rotation!), but, in retrospect, I am glad that I was constantly challenged to do something in an even better way and never permitted to give up. Indeed, I didn't fully appreciate the rigor of our analysis until our results were final, but hindsight is always 20/20. Also, I thank Jim for numerous comments and suggestions on this thesis; it is much better and much more complete because of his many suggestions. Andrei was the true guru (read: czar) of our analysis efforts, and he instilled in me the importance of careful work.I especially appreciate Andrei's timely responses to the numerous questions I always had concerning the analysis and the various analysis tools that we used; if there was someone who was sure to know the answer, that person was Andrei. Without Andrei, our analysis efforts would never have gotten off the ground. I also offer thank...

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“…It served to measure the polarized neutron structure function in deep inelastic electron scattering [3]. A Mainz-Paris-Collaboration realized the first dense MEOP target which led to the measurement of the electric form factor ofthe neutron in quasi-elastic electron scattering [4]. Another motivation was to realize a broadband spin filter for neutron beams, based on the huge spin dependent absorption cross section of3He [5] (see also W. Heil at the International Workshop HELION02, Oppenheim, Germany (2002), [6]).…”

Section: Polarizing and Handling Larger Quantities Of Noble Gasmentioning

confidence: 99%

Take a breath of polarized noble gas

Otten

2004

Europhysics News

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First measurement of the electric formfactor of the neutron in the exclusive quasielastic scattering of polarized electrons from polarized 3He

Cited by 182 publications

References 21 publications

Nucleon electromagnetic form factors

Nucleon electromagnetic form factors

The neutron electric form factor to Q² = 1.45 (GeV/c)²

Take a breath of polarized noble gas

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