[PDF] Final State Effects In Inclusive Quasielastic Electron Scattering From Nuclei eBook

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File Size : 39,30 MB
Release : 1988
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The impulse approximation (IA) predicts that momentum distributions, n/sub k/, in many-body systems should be measurable by inclusive quasielastic scattering at high energy and momentum (w, Q) transfer. The observations that the cross section appears to satisfy ''Y-scaling'' (i.e., is a function not of both w and Q of a single variable, Y) is usually taken as a signature of the IA. In nuclear physics, inelastic electron scattering at GeV energies should reveal the high momentum components of the nuclear wave function. In quantum fluids, neutron scattering at hundreds of MeV energies should measure the Bose condensate in superfluid 4He and the Fermi surface discontinuity and depletion of the Fermi sea in 3He. In molecular and condensed matter systems, X-ray Compton scattering at keV energies reveals electronic n/sub k/. Such experiments test many-body wave functions calculated by methods such as Green Function and Path Integral Monte Carlo, and Fermi Hypernetted Chain. However, an outstanding issue has been the corrections to the IA due to the scattering of the recoiling particle from neighboring particles, which are termed ''final state effects'' (FSE). The FSE should be especially important in nuclei and quantum fluids where the potentials have steeply repulsive cores. While there have been a variety of theories proposed for FSE, until now none has been adequately tested by experiment. Recently, the ''hard core perturbation theory'' (HCPT) for FSE in quantum fluids by Silver has been successfully compared to new neutron scattering measurements on 4He by P.E. Sokol and colleagues. In this paper, we shall discuss the lessons of this success for the extraction of n/sub k/ in nuclei by inclusive ''quasielastic electron-nucleus scattering'' (QENS). 19 refs., 12 figs.

Author : Amand Faessler
Publisher : Elsevier
Page : 390 pages
File Size : 13,74 MB
Release : 2016-06-06
Category : Science
ISBN : 1483103196

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Progress in Particle and Nuclear Physics, Volume 24: The Nature of Hadrons and Nuclei by Electron Scattering covers the proceedings of the International School of Nuclear Physics. The book presents 24 papers that discuss topics concerning hadrons and nuclei. The coverage of the text includes electron scattering and few-nucleon systems; occupation probabilities of shell-model orbitals; and the response function of nuclear matter. The book also tackles the internal spin structure of the nucleon; parity-violating electron scattering; and hard pion exchange currents and the backward deuteron disintegration. The text will be of great use to scientists involved in hadron and nucleon research.

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Page : 16 pages
File Size : 46,62 MB
Release : 1989
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A microscopic Green's function doorway formalism is used to study Coulomb sum rule saturation in inclusive quasielastic electron scattering as a function of momentum transfer. Form factor, kinematical restriction, and final-state interaction effects on the approach to saturation are examined in detail, as are the roles of nonhermiticity, energy dependence, and the analytic behavior of the final-state interactions. The implications of relativistic kinematics and dynamics for the approach to saturation at not-too-high values of the momentum transfer are assessed. Because the pair production of relativistic treatments destroys the asymptotic nature of the nonrelativistic Coulomb sum rule, the degree to which a regime of validity can be expected for this sum rule, and its location, is considered. The breakdown of the sum rule as the momentum transfer increases is also examined. Similar theoretical studies of an analogous nonrelativistic transverse sum in its saturation region are developed as well. Theoretical predictions are compared with the experimental data for 4°Ca both directly and using a variety of theoretical prescriptions and limits. Neutron knockout contributions and associated uncertainties due to ambiguity in the free neutron form factors are examined.

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Page : pages
File Size : 38,63 MB
Release : 2007
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Inclusive electron scattering from nuclei at large x and Q^ is the result of a reaction mechanism that includes both quasi-elastic scattering from nucleons and deep inelastic scattering from the quark consitituents of the nucleons. Data in this regime can be used to study a wide variety of topics, including the extraction of nuclear momentum distributions, the influence of final state interactions and the approach to _v-scaling, the strength of nucleon-nucleon correlations, and the approach to x- scaling, to name a few. Selected results from the recent experiment E02-019 at the Thomas Jefferson National Accelerator Facility will be shown and their relevance discussed.

Author : Sigfrido Boffi
Publisher : Clarendon Press
Page : 522 pages
File Size : 25,62 MB
Release : 1996
Category : Science
ISBN : 9780198517740

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This book covers the structure and dynamics of atomic nuclei in terms of nucleons, pions, and quarks, all within a unified treatment of the nuclear response to an electromagnetic probe. The basic formalism is presented to describe the electromagnetic field and its interaction with nuclear matter for both real and virtual photons. Nuclear response is then analyzed in terms of structure functions in the case of inclusive and semi-inclusive inelastic electron scattering. The discussion covers pion production and one- or two-nucleon emission and compares the results with available data. The formalism is also extended to incident polarized electrons, polarized targets and nuclear recoil polarization. It contains a comprehensive description of photonuclear reactions at intermediate energies and a review of experimental data and previous theoretical approaches.

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File Size : 27,31 MB
Release : 2008
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The nucleon final-state interaction in electron-nucleus quasielastic scattering is studied. Based on the unitarity equation satisfied by the scattering-wave operators, a doorway model is developed to implement the Pauli-blocking of nucleon knockout. The model is complementary to the commonly used nuclear Fermi gas model which can not be applied with confidence to light- and medium-mass nuclei. Pauli blocking in these latter nuclei is illustrated with the case of Coulomb interaction. Significant effects are noted for beam energies below (almost equal to) 350 MeV/c. Extension of the model to high-energy hadron-nucleus quasielastic scatterings is discussed.