Response of nuclear matter to electromagnetic probes.
Item
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Title
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Response of nuclear matter to electromagnetic probes.
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Identifier
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AAI9130385
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identifier
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9130385
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Creator
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Wang, Hui-wen.
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Contributor
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Adviser: Carl M. Shakin
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Date
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1991
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Nuclear
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Abstract
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We develop methods for the calculation of the hadronic tensor that describes the response of nuclear matter to an electromagnetic probe and study the role of final-state interactions, making use of the theory of Horikawa, Lenz and Mukhopadhay. Recently, extensive calculations of such final-state interaction effects in quasielastic (e,e{dollar}\sp\prime{dollar}) reactions have been performed by Chinn, Picklesimer and Van Orden for finite nuclei. Our nuclear matter calculations reproduce the qualitative features found by those authors, including a significant "quenching" of the longitudinal response, if one uses a relativistic description of the process. While we are able to achieve an improved fit to a body of experimental data for the longitudinal response using this formalism, definitive conclusions cannot be drawn without extending the analysis so that the Ward-Takahashi identity is satisfied. We also find quenching of the transverse response in the region of the quasielastic peak; however, it is unclear as to whether that creates a problem for the theory, since the transverse response is known to have contributions from the excitation of the delta resonance and various multinucleon processes. We extend the discussion of Bentz, Arima, Hyuga, Shimizu and Yazaki, who considered the role of the Ward-Takahashi identity in the calculation of the electromagnetic response in nuclear matter, to higher values of the momentum transfer. We place particular emphasis on a class of diagrams for which the Ward-Takahashi identity relates the nucleon self-energy to a vertex correction. Consideration of this class of diagrams leads to the definition of an effective one-body model for ejection of a nucleon from the Fermi sea. We provide a systematic diagrammatic analysis for some members of this class of diagrams and indicate how an expansion in powers of the density of the medium may be made. In this manner we exhibit procedures for the evaluation of such corrections.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
