Relations between isoscalar charge form factors of two- and three-nucleon systems

Henning, H.; Adam, J.; Sauer, P. U.; Stadler, Alfred

doi:10.1103/physrevc.52.r471

Cited by 24 publications

(22 citation statements)

References 41 publications

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“…Its magnitude (.0038 ± .0003) is clearly inconsistent with the corresponding one of the three-nucleon isoscalar charge form factor, still within the same model calculations [36]. The t 21 results of Ref.…”

Section: Resultsmentioning

confidence: 66%

“…[21,26]. Assuming as we do here implicitly that these two data sets have the same weight, the location of this node is not quite consistent with a relation between the two-and three-nucleon isoscalar charge form factors, established with various N − N potentials [36]. The secondary maximum of |G C | is very flat, so that its location (5.3 ± .5…”

Section: Resultsmentioning

confidence: 71%

See 1 more Smart Citation

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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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 71%

Phenomenology of the deuteron electromagnetic form factors

Abbott

Ahmidouch²,

Anklin

et al. 2000

EPJ A

133

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“…Cross section measurements yield the structure functions A͑G C , G Q , G M ͒ and B͑G M ͒, which combined with T 20 ͑G C , G Q , G M ͒ allow the determination of these form factors [1]. The present data set for elastic e-2 H scattering and the isoscalar charge form factor of the three-body system pose an interesting puzzle [14] for the few-body theory: there exists no theoretical model capable of describing all measurements simultaneously. T 20 has only a limited data set, and accurate measurements of this observable are required to address this issue.…”

mentioning

confidence: 89%

Measurement of Tensor Analyzing Powers for Elastic Electron Scattering from a Polarized2H Target Internal to a Storage Ring

Ferro‐Luzzi¹,

Bouwhuis²,

Passchier³

et al. 1996

Phys. Rev. Lett.

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We report an absolute measurement of the tensor analyzing powers T 20 and T 22 in elastic electrondeuteron scattering at a momentum transfer of 1.6 fm 21 . The novel approach of this measurement is the use of a tensor polarized 2 H target internal to an electron storage ring, with in situ measurement of the polarization of the target gas. Scattered electrons and recoil deuterons were detected in coincidence with two large acceptance nonmagnetic detectors. The techniques demonstrated have broad applicability to further measurements of spin-dependent electron scattering.[ S0031-9007(96) Measurements of spin-dependent electron scattering have the potential to greatly enhance our understanding of nucleon and nuclear structure. For example, spin observables in elastic, quasielastic, and deep-inelastic scattering from polarized deuterium are predicted to provide important information on the effects of D-wave components in the ground state of 2 H [1], the largely unknown charge form factor of the neutron [2], and the neutron spin structure functions [3]. This has prompted development of both polarized 2 H targets for use with internal [4] or external beams [5] and polarimeters for measuring the polarization of recoiling hadrons [6]. Indeed the first round of measurements of spin-dependent e-2 H scattering has been carried out at Novosibirsk [7,8], Bonn [9], MITBates [10,11], and SLAC [12].The measurement of analyzing powers and spincorrelation parameters in spin-dependent electron scattering from polarized nuclei is optimally performed by scattering electrons from a pure and highly polarized target. Polarized internal gas targets in electron storage rings have the advantage that spin-dependent scattering from chemically and isotopically pure atomic species of high polarization can be realized. They offer rapid polarization reversal and flexible orientation of the nuclear spin direction by using low magnetic holding fields, a low thickness at high luminosity which allows for the detection of low-energy recoiling hadrons, and access to a broad kinematic range by using large acceptance detectors. For polarized deuterium one has the additional ability to reverse the tensor polarization, P zz , at fixed vector polarization, P z , and vice versa. Subsequently, small systematic errors can be expected.The first pioneering measurements [7,8] with a polarized deuterium internal target have been carried out at VEPP-3 in Novosibirsk. They realized a target with a thickness limited to about 3 3 10 11 atoms cm 22 [8] as viewed by their detectors. Recently, this was increased by an order of magnitude [13]. Since many mechanisms can depolarize the target nuclei in the storage cell, and no polarimeters were available to measure the target polarization in situ, they normalized one datum to a theoretical prediction, setting the scale for the other data points [8].The electron spin-averaged cross section for elastic electron-deuteron scattering can be expressed [1] as s s 0

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“…to draw attention to the work in [124] where relations between isoscalar charge form factors of two-and three-nucleon systems were studied and inconsistencies were found using the "standard" model of meson exchange currents. is in quite good agreement with the data up to about 4 fm −1 , while the two-body current dependent isovector magnetic form factor is dramatically off the data in the higher Q-range as shown in Fig.…”

Section: Comparison With Datamentioning

confidence: 99%

Electron and photon scattering on three-nucleon bound states

et al. 2005

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A big spectrum of processes induced by real and virtual photons on the 3 He and 3 H nuclei is theoretically investigated through many examples based on nonrelativistic Faddeev calculations for bound and continuum states. The modern nucleon-nucleon potential AV18 together with the threenucleon force UrbanaIX is used. The single nucleon current is augmented by explicit π-and ρ-like two-body currents which fulfill the current continuity equation together with the corresponding parts of the AV18 potential. We also employ the Siegert theorem, which induces many-body contributions to the current operator. The interplay of these different dynamical ingredients in the various electromagnetic processes is studied and the theory is compared to the experimental data.Overall we find fair to good agreement but also cases of strong disagreement between theory and experiment, which calls for improved dynamics. In several cases we refer the reader to the work of other groups and compare their results with ours. In addition we list a number of predictions for observables in different processes which would challenge this dynamical scenario even more stringently and systematically.

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Relations between isoscalar charge form factors of two- and three-nucleon systems

Cited by 24 publications

References 41 publications

Phenomenology of the deuteron electromagnetic form factors

Phenomenology of the deuteron electromagnetic form factors

Measurement of Tensor Analyzing Powers for Elastic Electron Scattering from a Polarized2H Target Internal to a Storage Ring

Electron and photon scattering on three-nucleon bound states

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