Precise Neutron and Proton Form Factors at Low Momentum Transfers

Drickey, D.; Hand, L. N.

doi:10.1103/physrevlett.9.521

Cited by 152 publications

(44 citation statements)

References 25 publications

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“…The existing experimental data on the root mean square (rms) proton charge radius [157,158] lead to the proton size correction about 1100 kHz for the 1S state in hydrogen and about 140 kHz for the 2S state, and is thus much larger than the experimental accuracy of the Lamb shift measurements. Unfortunately, there is a discrepancy between the results of [157,158], which influences the theoretical prediction for the Lamb shifts, and a new experiment on measuring the proton charge radius is badly needed.…”

Section: A Spin One-half Nucleimentioning

confidence: 99%

“…Unfortunately, there is a discrepancy between the results of [157,158], which influences the theoretical prediction for the Lamb shifts, and a new experiment on measuring the proton charge radius is badly needed. A new value of the proton charge radius was derived recently from the improved theoretical analysis of the low momentum transfer scattering experiments [159].…”

Section: A Spin One-half Nucleimentioning

confidence: 99%

“…Hence, in order to determine the form factor experimentally one has in principle to calculate electromagnetic corrections to the elastic electron-nucleus scattering which is usually used to measure the form factors [157,158]. In the usual fit to the experimental data not all electromagnetic corrections to the scattering amplitude are usually taken into account (see e.g., discussion in [7,63]).…”

Section: Empirical Nuclear Form Factor and The Contributions To Thmentioning

confidence: 99%

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Theory of light hydrogenlike atoms

2001

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The present status and recent developments in the theory of light hydrogenic atoms, electronic and muonic, are extensively reviewed. The discussion is based on the quantum field theoretical approach to loosely bound composite systems. The basics of the quantum field theoretical approach, which provide the framework needed for a systematic derivation of all higher order corrections to the energy levels, are briefly discussed. The main physical ideas behind the derivation of all binding, recoil, radiative, radiative-recoil, and nonelectromagnetic spin-dependent and spin-independent corrections to energy levels of hydrogenic atoms are discussed and, wherever possible, the fundamental elements of the derivations of these corrections are provided. The emphasis is on new theoretical results which were not available in earlier reviews. An up-to-date set of all theoretical contributions to the energy levels is contained in the paper. The status of modern theory is tested by comparing the theoretical results for the energy levels with the most precise experimental results for the Lamb shifts and gross structure intervals in hydrogen, deuterium, and helium ion He + , and with the experimental data on the hyperfine splitting in muonium, hydrogen and deuterium. *

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Section: A Spin One-half Nucleimentioning

confidence: 99%

Section: A Spin One-half Nucleimentioning

confidence: 99%

Section: Empirical Nuclear Form Factor and The Contributions To Thmentioning

confidence: 99%

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Theory of light hydrogenlike atoms

2001

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“…The three paramaterizations described below are determined through a χ 2 minimization involving 269 cross section data points [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and 39 polarization data points [21][22][23][24][25][26][27][28][29]. In most polarization data, and in some cross section data, the systematic uncertainties are dominant and may vary from point to point in a given experiment.…”

Section: Parameterization Of the Form Factorsmentioning

confidence: 99%

Phenomenology of the deuteron electromagnetic form factors

Abbott

Ahmidouch²,

Anklin

et al. 2000

EPJ A

133

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A rigorous extraction of the deuteron charge form factors from tensor polarization data in elastic electron-deuteron scattering, at given values of the 4-momentum transfer, is presented. Then the world data for elastic electron-deuteron scattering is used to parameterize, in three different ways, the three electromagnetic form factors of the deuteron in the 4-momentum transfer range 0-7 fm −1 . This procedure is made possible with the advent of recent polarization measurements. The parameterizations allow a phenomenological characterization of the deuteron electromagnetic structure. They can be used to remove ambiguities in the form factors extraction from future polarization data.

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“…Refenes) Fl Reatio Quant nN-o Bumiller (1961) [24] Lehmann (1962) [25] Drickey (1962) [26] Dudelzak (1963) [27] Berkelman (1963) [ Borkowski (1975) [53,54] Simon (1980) [55] Bosted (1990) [56] Sill (1993) [57,58] Walker (1994) [59,60] Andivahis (1994) [61,62] Mark III…”

mentioning

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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Precise Neutron and Proton Form Factors at Low Momentum Transfers

Cited by 152 publications

References 25 publications

Theory of light hydrogenlike atoms

Theory of light hydrogenlike atoms

Phenomenology of the deuteron electromagnetic form factors

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

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