Relativistic corrections in deuteron electrodisintegration at the quasi-elastic peak

Mosconi, B.; Ricci, P.

doi:10.1016/0375-9474(90)90213-6

Cited by 38 publications

(24 citation statements)

References 22 publications

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“…In the unpolarized ͑e, e 0 p͒ reaction, the information on the dynamics of the two-nucleon system is contained in four structure functions: the longitudinal f L , the transverse f T , and the interference terms f LT and f TT . Measurements of the differential cross section and in some cases of the individual structure functions f L , f T , and f LT [3][4][5][6][7][8][9][10][11][12][13][14][15] have provided stringent tests of the existing theoretical models [16][17][18][19]. In particular, the f L and f T data were reproduced by the existing calculations [7,10], while the f LT data pointed to the need for a relativistic form of the current operator [8,[11][12][13][14].…”

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confidence: 99%

Deuteron Electrodisintegration in theΔ-Resonance Region

et al. 1997

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The differential cross section and the transverse-transverse interference structure function for the reaction 2 H͑e, e 0 p͒n have been determined at an np invariant mass of 2.16 GeV. The data, covering a 40 ± range in the proton emission angle, indicate that D excitation and subsequent ND interaction is the dominant reaction mechanism. Calculations performed within an ND coupled-channel approach reproduce the cross section data, but underestimate the f TT results by 30 to 40 percent.[S0031-9007(97)03090-1] PACS numbers: 25.10. + s, 13.60. Rj, 13.75.Cs, 25.30.Rw Deuteron electrodisintegration in the D-resonance region offers an excellent probe to investigate the dynamics of the D isobar in a nuclear system. While at low energy transfer the deuteron response is reproduced by microscopic calculations based on realistic NN potentials, at higher energy transfer the first nucleon resonance, the D or P 33 baryon, plays an important role. This has been illustrated in several theoretical studies [1,2].Many electron scattering experiments have been devoted to deuteron disintegration in quasifree kinematics. Of these, the exclusive ͑e, e 0 p͒ measurements have provided the most detailed information on the deuteron structure. In the unpolarized ͑e, e 0 p͒ reaction, the information on the dynamics of the two-nucleon system is contained in four structure functions: the longitudinal f L , the transverse f T , and the interference terms f LT and f TT . Measurements of the differential cross section and in some cases of the individual structure functions f L , f T , and f LT [3][4][5][6][7][8][9][10][11][12][13][14][15] have provided stringent tests of the existing theoretical models [16][17][18][19]. In particular, the f L and f T data were reproduced by the existing calculations [7,10], while the f LT data pointed to the need for a relativistic form of the current operator [8,[11][12][13][14]. The measurement of f TT is more difficult, since it requires the detection of protons outside of the electron scattering plane. Hitherto, only one measurement [6] has been reported, at very low transferred energy and momentum ͑v, jqj͒ ͑18 MeV, 160 MeV͞c͒; the f TT results were not significantly different from zero.Although the effects of D isobar currents (IC) are small in quasifree kinematics, they are expected to become important at higher excitation energies. In the Dresonance region, which corresponds to an np invariant mass W np of about 2.17 GeV, one has to treat the D isobar and the nucleon degrees of freedom in a coupledchannel (CC) approach, as was shown for NN scattering in Ref. [20], and for electromagnetic deuteron break-up first in Ref.[21] and more recently in improved calculations in Refs. [22,23]. These models predict that the 2 H͑e, e 0 p͒n reaction in the D-resonance region is almost purely transverse in character and therefore the structure functions f T and f TT essentially generate the entire cross section. These structure functions in turn are predicted to have the characteristic features of a dominant M1 multipo...

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confidence: 99%

Deuteron Electrodisintegration in theΔ-Resonance Region

et al. 1997

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“…For deuteron electrodisintegration, it has been shown that relativistic effects appear at rather low energies and lead to a substantial modification of the observables [32,33,34,35,36]. Nucleons produced in γ * d → np are relativistic at relatively small E np .…”

Section: Introductionmentioning

confidence: 99%

Relativistically invariant analysis of polarization effects in exclusive deuteron electrodisintegration process

Gakh¹,

Rekalo²,

Tomasi–Gustafsson³

2005

Annals of Physics

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“…On the other hand, the NR calculations were truncated at first order in while Mosconi and Ricci (156) have demonstrated that higher-order contributions, primarily the Darwin-Foldy term, significantly enhance R LT and suppress for these kinematics. The measurements of made at Bonn by Frommberger et al (137) for MeV/c are consistent with those of NIKHEF where they overlap and are also described better when relativistic corrections to the NR+MEC+IC model are applied.…”

Section: The Reactionmentioning

confidence: 99%

“…(138) More detailed investigation of the nuclear current for bound nucleons requires separation of the nuclear response function into its various components. For example, in nonrelativistic (NR) calculations is expected to be particularly sensitive to relativistic corrections of the current operator, (156) while is expected to be particularly sensitive to meson-exchange and isobar contributions (NR+MEC+IC). (154,155) The first experiment to use outof-plane detection of the ejectile was made using the pulse-stretcher ring at Sendai by Tamae et al (153) for the reaction using 129 MeV electrons scattered by…”

Section: The Reactionmentioning

confidence: 99%

“…For MeV/c, is consistent with unity for deuterium but remains suppressed for For systematic errors better than ±11% were claimed, and the data for both and are qualitatively consistent with those of NIKHEF. These response functions were compared with four nonrelativistic calculations, (91,152,156,159) which all use the same deuteron wave function based upon the Paris potential but which differ primarily in their The NIHKEF data of van der Schaar et al (136) are compared with NR (dotted) and NR+MEC+IC (dashed) calculations by Fabian and Arenhövel, (154,155) calculations by Mosconi and Ricci (dot-dash) (156) which include relativistic corrections, and fully relativistic calculations by Hummel and Tjon (solid). (158,160) prescriptions for inclusion of relativistic corrections.…”

Section: The Reactionmentioning

confidence: 99%

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