Author: Nadia Fomin
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author:
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Category :
Languages : en
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Experiment E02-019, performed in Hall C at the Thomas Jefferson National Accelerator Facility (TJNAF), was a measurement of inclusive electron cross sections for several nuclei (2H,3He, 4He, 9Be,12C, 63Cu, and 197Au) in the quasielastic region at high momentum transfer. In the region of low energy transfer, the cross sections were analyzed in terms of the reduced response, F(y), by examining its y-scaling behavior. The data were also examined in terms of the nuclear structure function [nu]WA 2 and its behavior in x and the Nachtmann variable [xi]. The data show approximate scaling of [nu]WA 2 in [xi] for all targets at all kinematics, unlike scaling in x, which is confined to the DIS regime. However, y-scaling observations are limited to the kinematic region dominated by the quasielastic response (y

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Languages : en
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Inclusive electron scattering is measured with 4.045 GeV incident beam energy from C, Fe, and Au targets. The measured energy transfers and angles correspond to a kinematic range for Bjorken x>1 and momentum transfers from Q2 = 1-7 (GeV/c)2. When analyzed in terms of the y-scaling function the data show for the first time an approach to scaling for values of the initial nucleon momenta significantly greater than the nuclear matter Fermi momentum (i.e.,>0.3 GeV/c).

Author: Donal Day
Publisher:
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Category :
Languages : en
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We will present results from a recently completed experiment (E02-019) at Jefferson Lab in which 6 GeV electrons were scattered from a series of both light and heavy nuclei at high momentum transfers. The scattered electrons were detected in the High Momentum Spectrometer in Hall C at angles between 18 and 50 degrees and with momenta between 2 and 5 GeV. This experiment extends the kinematic coverage of inclusive electron-nucleus scattering at high momentum transfer to large Bjorken x, forbidden for the free nucleon. These new data present the opportunity to the investigate the transition from a regime where the cross sections are dominated by quasielastic scattering and where nucleon degrees of freedom hold sway, to one where the reaction is deep inelastic in nature and described by the more fundamental quarks and gluons. A brief description of the experiment will be followed by a presentation of the preliminary data along with a discussion of the scaling behavior of the data.

Author: David Evans Andrews
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages : 362

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Author: Adelchi Fabrocini
Publisher: World Scientific
ISBN: 9814551775
Category :
Languages : en
Pages : 378

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The workshop aimed to gather the electron scattering community to assess the present status of the experimental and theoretical research program at the electron scattering facilities that will be available in the near future. The topics discussed include nucleon form factors and deep inelastic structure functions, electro-production of nucleon resonances, final state interactions and nucleon-nucleon correlations in nuclei, electron-nucleon scattering with polarized beams and targets and nuclear transparency.

Author: Christopher Douglas Cothran
Publisher:
ISBN:
Category :
Languages : en
Pages : 416

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Author: Huan Yao
Publisher:
ISBN:
Category :
Languages : en
Pages : 169

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Coulomb Sum Rule states that the integration of the longitudinal response of a nucleus over the range of energy excitation dominated by quasi-elastic proton knock-out process should be equal to the total number of protons in the nucleus. The test of Coulomb Sum Rule will shed light on the question of whether or not the properties of nucleon are modified in the nuclear medium. In order to test the Coulomb Sum Rule in nuclei, a precision measurement of inclusive electron scattering cross sections in the quasi-elastic region was performed at Jefferson Lab. Incident electrons with energies ranging from 0.4 GeV to 4 GeV scattered from 4He, 12C, 56Fe and 208Pb nuclei at four scattering angles ( 15°, 60°, 90°, 120°) and scattered energies ranging from 0.1 GeV to 4 GeV. The Rosenbluth method with proper coulomb corrections is used to extract the transverse and longitudinal response functions at three-momentum transfers in the range 0.55 GeV/c ≤ |q| ≤ 1.0 GeV/c. The Coulomb Sum Rule is determined in the same |q| range and compared to predictions. This work is supported by the Department Of Energy through grant DE-FG02-94ER40844.

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Languages : en
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CEBAF experiment e89-008 measured inclusive electron scattering from nuclei in a Q2 range between 0.8 and 7.3 (GeV/c)2 for x{sub Bjorken} approximately greater than 1. The cross sections for scattering from D C, Fe, and Au were measured. The C, Fe, and Au data have been analyzed in terms of F(y) to examine y-scaling of the quasielastic scattering, and to study the momentum distribution of the nucleons in the nucleus. The data have also been analyzed in terms of the structure function vW2 to examine scaling of the inelastic scattering in x and xi and to study the momentum distribution of the quarks. In the regions where quasielastic scattering dominates the cross section (low Q2 or large negative values of y), the data are shown to exhibit y-scaling. However, the y-scaling breaks down once the inelastic contributions become large. The data do not exhibit x-scaling, except at the lowest values of x, while the structure function does appear to scale in the Nachtmann variable, xi.

Author: Bernard Frois
Publisher: World Scientific
ISBN: 9789971509750
Category : Science
Languages : en
Pages : 832

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Book Description
This book summarizes the considerable progress recently achieved in the understanding of nucleon and nuclear structure by using high energy electrons as a probe. A collection of papers discusses in detail the new frontiers of this field. Experimental and theoretical articles cover topics such as the structure of the nucleon, nucleon distributions, many-body correlations, non-nucleonic degrees of freedom and few-body systems. This book is an up-to-date introduction to the research planned with continuous beam electron accelerators.