Relativistic calculations for the exclusive photoproduction of {eta} mesons from complex nuclei

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.56.1557· OSTI ID:560987

Hedayati-Poor, M; Sherif, H S ^[1]

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1. Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2J1 (CANADA)

A relativistic model for the quasifree photoproduction of {eta} mesons from complex nuclei is developed. The interactions between fields are introduced through effective Lagrangians. Contributions from several nucleon resonances as well as nucleon Born terms and vector meson exchange diagrams are included. Nucleon and {eta} wave functions are solutions of Dirac and Klein-Gordon equations, respectively. Final state interactions of the outgoing particles are included via optical potentials. The effects of these interactions on the cross sections and photon asymmetries are studied and are found to be large. Calculations indicate that at energies near threshold the exclusive reaction takes place mainly through formation of the S{sub 11}(1535) resonance. Comparisons with the nonrelativistic calculations show differences between the two approaches both for the cross sections and photon asymmetries. We give some detailed predictions for the reaction observables for exclusive photoproduction on {sup 12}C, {sup 16}O, and {sup 40}Ca. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 560987
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 3 Vol. 56; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CALCIUM 40 TARGET
CARBON 12 TARGET
CROSS SECTIONS
DIRAC EQUATION
ETA MESONS
FINAL-STATE INTERACTIONS
KLEIN-GORDON EQUATION
LAGRANGIAN FUNCTION
NUCLEAR FORCES
NUCLEONS
OXYGEN 16 TARGET
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
QUASI-FREE REACTIONS
RESONANCE
WAVE FUNCTIONS