Final state interactions and relativistic effects in the quasielastic (e,e') reaction

Technical Report · Tue Nov 01 00:00:00 EST 1988

OSTI ID:6606388

Chinn, C R; Picklesimer, A; Van Orden, J W

The longitudinal and transverse response functions for the inclusive quasielastic (e,e') reaction are analyzed in detail. A microscopic theoretical framework for the many-body reaction provides a clear conceptual (nonrelativistic) basis for treating final state interactions and goes far beyond simple wave or Hermitean potential models. The many-body physics of inelastic final state channels as described by optical and multiple scattering theories included by incorporating a full complex optical potential. Explicit nonrelativistic and relativistic momentum-space calculations quantitatively demonstrate the importance of such a treatment of final state interactions for both the transverse and longitudinal response. Nonrelativistic calculations are performed using final state interactions based on phenomenology, local density models and microscopic multiple scattering theory. Relativistic calculations span a similar range of models and employ Dirac bound state wave functions. The theoretical extension to relativistic dynamics is of course not clear, but is done in obvious parallel to elastic proton scattering. Extensive calculations are performed for UCa at momentum transfers of 410, 550 and 700 MeV/c. A number of interesting physical effects are observed, including significant relativistic suppressions (especially for R/sub L/), large-off-shell and virtual pair effects, enhancement of the tails of the response by the final state interactions, and large qualitative and even shape distinctions between the predictions of the various models of the final state interactions. None of the models is found to be able to simultaneously predict the data for both response functions. This strongly suggests that additional physical mechanisms are of qualitative importance in inclusive quasielastic electron scattering. 48 refs., 16 figs.

• Research Organization: Southeastern Universities Research Association, Newport News, VA (USA). Continuous Electron Beam Accelerator Facility; Los Alamos National Lab., NM (USA)
• DOE Contract Number: AC05-84ER40150; W-7405-ENG-36
• OSTI ID: 6606388
• Report Number(s): DOE/ER/40150-57; CEBAF-PR-88-020; ON: DE89006253
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CALCIUM 40 TARGET
ELECTRON REACTIONS
RESPONSE FUNCTIONS
ELECTRONS
QUASI-ELASTIC SCATTERING
CALCULATION METHODS
DIFFERENTIAL CROSS SECTIONS
ENERGY TRANSFER
GREEN FUNCTION
MATRIX ELEMENTS
MOMENTUM TRANSFER
NUCLEON-NUCLEON POTENTIAL
RELATIVISTIC RANGE
SCATTERING AMPLITUDES
WAVE FUNCTIONS
AMPLITUDES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FUNCTIONS
LEPTON REACTIONS
LEPTONS
NUCLEAR REACTIONS
POTENTIALS
QUASI-FREE REACTIONS
SCATTERING
TARGETS
645201* - High Energy Physics- Particle Interactions & Properties-Theoretical- General & Scattering Theory