[PDF] Quasi Elastic Nuclear Scattering At High Energies eBook

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 26 pages
File Size : 25,47 MB
Release : 2018-07-10
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ISBN : 9781722718961

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The quasi-elastic scattering of two nuclei is considered in the high-energy optical model. Energy loss and momentum transfer spectra for projectile ions are evaluated in terms of an inelastic multiple-scattering series corresponding to multiple knockout of target nucleons. The leading-order correction to the coherent projectile approximation is evaluated. Calculations are compared with experiments. Cucinotta, Francis A. and Townsend, Lawrence W. and Wilson, John W. Langley Research Center RTOP 593-42-21-01...

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Page : pages
File Size : 22,45 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 : J Colmenero
Publisher : World Scientific
Page : 326 pages
File Size : 42,65 MB
Release : 1994-09-30
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ISBN : 981455216X

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The aim of the workshop is to review the recent developments in both quasielastic and high-resolution inelastic neutron scattering. A special emphasis will be put on the new possibilities which will open up in medium term future with the commissioning of large-scale installations, as well as on new perspectives based on recent progress in the microscopic modeling of phenomena amendable to study by inelastic neutron scattering.

Author : Mark T F Telling
Publisher : Royal Society of Chemistry
Page : 169 pages
File Size : 40,51 MB
Release : 2020-07-07
Category : Science
ISBN : 1788019261

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The technique of Quasi-Elastic Neutron Scattering (QENS) is a powerful experimental tool for extracting temporal and spatial information at the nanoscale from both soft and hard condensed matter systems. However, while seemingly simple, the method is beset with sensitivities that, if ill considered, can hinder data interpretation and possibly publication. By highlighting key theoretical and data evaluation aspects of the technique, this specialised ‘primer style’ training resource encourages research success by guiding new researchers through a typical QENS experiment; from planning and sample preparation considerations to data reduction and subsequent analysis. Research examples are referenced throughout to illustrate the concepts addressed, with the book being written in such a way that it remains accessible to chemists, biologists, physicists, and materials scientists.

Author : Bernard Frois
Publisher : World Scientific
Page : 810 pages
File Size : 44,36 MB
Release : 1991-08-16
Category : Science
ISBN : 9814507253

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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.

Author : John Negele
Publisher : Springer
Page : 229 pages
File Size : 20,78 MB
Release : 2013-12-19
Category : Science
ISBN : 1461398983

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"Analytic Insights into Intermediate-Energy Hadron-Nucleus Scattering," by R. D. Amado, presents a review of optical diffraction leading into discussions of elastic scattering, single- and multistep inelastic scattering, spin observables, and directions indicated for further research. "Recent Developments in Quasi-Free Nucleon-Nucleon Scattering," by P. Kitching, W. J. McDonald, Th. A. J. Maris, and C. A. Z. Vascon cellos, opens with a comprehensive review of the theory, going on to detail frontier research advances in spin dependence in (p, 2p) scattering, isospin dependence, and other quasi-free reactions. The final chapter, "Energetic Particle Emission in Nuclear Reactions" by D. H. Baal, explores new findings regarding direct interactions in the nucleus, thermalization and multiple scattering in nucleon emission, light fragment formation, and production of intermediate-mass fragments. A valuable and instructive trio of papers, Volume 15 of Advances in Nuclear Physics will be of interest to nonspecialists as well as specialists in the fields of nuclear physics, high-energy physics, and theoretical physics. J. W. NEGELE E. VoGT ix CONTENTS Chapter 1 ANALYTIC INSIGHTS INTO INTERMEDIATE-ENERGY HADRON-NUCLEUS SCATTERING R. D. Amado I. Introduction . . . . . . . . . . . . . . . . . . . . .

Author : S. D. DRELL
Publisher :
Page : 1 pages
File Size : 25,14 MB
Release : 1961
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ISBN :

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IN THE SCATTERING OF VERY HIGH-ENERGY PROTONS FROM THE NUCLEONS WITHIN TARGET NUCLEI, IT IS FOUND THAT THE SCATTERED PROTONS HAVE A DISTRIBUTION OF ENERGIES. These experiments where performed which show a sharp peak in the energy distribution which corresponds to elastic scattering of the incident protons, and also a broader peak at somewhat lower energy which corresponds to nearly elastic scattering of the incident protons. An explanation of this latter quasi-elastic peak is offered in terms of the diffraction scattering of one of the pions in the cloud of the target nucleon. This diffraction scattering of the pion by the incident nucleon results in a moderate energy loss of the nucleon, so that it emerges in the quasi-elastic peak. (Author).