Longitudinal response functions for 40Ca from quasi-elastic electron scattering

Yates, T. C.; Williamson, C. F.; Schmitt, W.; Osborn, M.; Deady, M.; Zimmerman, Peter D.; Blatchley, Charles C.; Seth, K. K.; Sarmiento, M.; Parker, B.; Jin, Yanhe; Wright, L. E.; Onley, D.S.

doi:10.1016/0370-2693(93)90971-j

Cited by 51 publications

(21 citation statements)

References 17 publications

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“…(35,36) using the fact that 1/ cos 2 χ T L = 1 + tan 2 χ T L . In the data sets considered in the previous section the angle χ T L Scaling of the first kind of the longitudinal and transverse response functions has been studied some time ago by Finn et al [44].…”

Section: Scaling Of Separated Responsesmentioning

confidence: 99%

Superscaling of inclusive electron scattering from nuclei

1999

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We investigate the degree to which the concept of superscaling, initially developed within the framework of the relativistic Fermi gas model, applies to inclusive electron scattering from nuclei. We find that data obtained from the low energy loss side of the quasielastic peak exhibit the superscaling property, i.e. the scaling functions f (ψ ′ ) are not only independent of momentum transfer (the usual type of scaling: scaling of the first kind), but coincide for A ≥ 4 when plotted versus a dimensionless scaling variable ψ ′ (scaling of the second kind). We use this behavior to study as yet poorly understood properties of the inclusive response at large electron energy loss.

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Section: Scaling Of Separated Responsesmentioning

confidence: 99%

Superscaling of inclusive electron scattering from nuclei

1999

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“…For a number of nuclei and momentum transfers L/T-separations have been performed (Altemus et al, 1980;Barreau et al, 1983;Blatchley et al, 1986;Chen et al, 1991;Deady et al, 1986Deady et al, , 1983Finn et al, 1984;Meziani et al, 1992;VanReden et al, 1990;Williamson et al, 1997;Yates et al, 1993;Zimmerman, 1969). Often (but not always, see e.g.…”

Section: Fig 29 Separated Response Functions Formentioning

confidence: 99%

“…Starting in the early 1980's a series experiments began to measure data for a wide range of nuclei ( 2 H to U ), often as part of a program to separate the structure functions, both at Bates (Altemus et al, 1980;Blatchley et al, 1986;Deady et al, 1986Deady et al, , 1983Dow, 1987;Dow et al, 1988;Dytman et al, 1988;Hotta et al, 1984;O'Connell et al, 1987;Quinn et al, 1988;VanReden et al, 1990;Yates et al, 1993;Zimmerman et al, 1978) and at Saclay (Barreau et al, 1983;Gueye et al, 1999;Marchand et al, 1985;Meziani et al, 1985Meziani et al, , 1984Mougey et al, 1978;Zghiche et al, 1994) In 1996 an experiment at JLab, intended to extend the Q 2 and x range of the experiments, produced data in the quasielastic region out to 5 (GeV/c) 2 (Arrington, 1998;Arrington et al, 1999). In the last year a new experiment using the full energy of JLAB (6 GeV) extended these measurements even further using He, Be, C, Cu and Au targets.…”

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confidence: 99%

Electron-nucleus Scattering

Benhar¹,

Fabrocini²,

Schiavilla³

1994

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This article presents a review of the field of inclusive quasi-elastic electron-nucleus scattering. It discusses the approach used to measure the data and includes a compilation of data available in numerical form. The theoretical approaches used to interpret the data are presented. A number of results obtained from the comparison between experiment and calculation are then reviewed. The analogies and differences to other fields of physics exploiting quasi-elastic scattering from composite systems are pointed out. I. INTRODUCTIONThe energy spectrum of high-energy leptons (electrons in particular) scattered from a nuclear target displays a number of features. At low energy loss (ω) peaks due to elastic scattering and inelastic excitation of discrete nuclear states appear; a measurement of the corresponding form factors as a function of momentum transfer |q| gives access to the Fourier transform of nuclear (transition) densities. At larger energy loss, a broad peak due to quasi-elastic electron-nucleon scattering appears; this peak -very wide due to nuclear Fermi motion -corresponds to processes where the electron scatters from an individual, moving nucleon, which, after interaction with other nucleons, is ejected from the target. At even larger ω peaks that correspond to excitation of the nucleon to distinct resonances are visible. At very large ω, a structureless continuum due to Deep Inelastic Scattering (DIS) on quarks bound in nucleons appears. A schematic spectrum is shown in Fig. 1. At momentum transfers above approximately 500 MeV/c the dominant feature of the spectrum is the quasi-elastic peak.A number of questions have been investigated using quasi-elastic scattering:• The quasi-elastic cross section integrated over electron energy loss is proportional to the sum of electron-nucleon cross sections. Historically, this has been exploited in order to measure the neutron charge and magnetic form factors using mainly light (A < 4) nuclear targets. Today the emphasis has shifted to exposing possible medium modifications of the nucleon form factors. * Electronic address: benhar@roma1.infn.it † Electronic address: dbd@virginia.edu ‡ Electronic address: ingo.sick@unibas.ch

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“…In particular, quasi-elastic scattering of electrons by nuclei has been used to investigate properties like the validity of the Coulomb sum rule in nuclei. Experiments have been performed at the MIT Bates Laboratory [1,2,3,4,5,6,7,8,9], at the Saclay Laboratory [10,11,12,13,14,15] and at SLAC [16,17,18]. Although the electron may in general be considered a weak probe, complications arise due to Coulomb distortion effects in the electron wave function owing to the nuclear charge distribution.…”

Section: Introductionmentioning

confidence: 99%

Eikonal analysis of Coulomb distortion in quasi-elastic electron scattering

Tjon

Wallace

2009

Indian J Phys

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An eikonal expansion is used to provide systematic corrections to the eikonal approximation through order 1/k 2 , where k is the wave number. Electron wave functions are obtained for the Dirac equation with a Coulomb potential. They are used to investigate distorted-wave matrix elements for quasi-elastic electron scattering from a nucleus. A form of effective-momentum approximation is obtained using trajectory-dependent eikonal phases and focusing factors. Fixing the Coulomb distortion effects at the center of the nucleus, the often-used ema approximation is recovered. Comparisons of these approximations are made with full calculations using the electron eikonal wave functions. The ema results are found to agree well with the full calculations.

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Longitudinal response functions for 40Ca from quasi-elastic electron scattering

Cited by 51 publications

References 17 publications

Superscaling of inclusive electron scattering from nuclei

Superscaling of inclusive electron scattering from nuclei

Electron-nucleus Scattering

Eikonal analysis of Coulomb distortion in quasi-elastic electron scattering

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