Meson-exchange-currents contribution to axial charge transitions

Journal Article · Sun Oct 31 23:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.48.2537· OSTI ID:5916451

Barenboim, G; Gattone, A O ^[1]; Izquierdo, E D ^[2]

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1. Departamento de Fisica, Comision Nacional de Energia Atomica, Avenida del Libertador 8250, 1429 Buenos Aires (Argentina)
2. Departamento de Fisica, FCEyN, Universidad de Buenos Aires, Pabellon 1, Ciudad Universitaria, 1428 Buenos Aires (Argentina)

We study the contribution of meson-exchange currents (MEC) to axial charge transitions in the framework of quantum hadrodynamics II. We extend a previous work which considered the contributions of one-body processes and vacuum polarization corrections. Calculations in mean-field theory (the Walecka model) and in the relativistic Hartree approximation are presented. In each of these cases we show results using pseudovector and pseudoscalar [pi][ital N] coupling. We find that the MEC contribution to the process is always sizable (much more so when using pseudoscalar coupling), transition dependent, and very sensitive to the coupling at the [rho][pi] vertex.

• OSTI ID: 5916451
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 48:5; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663120* -- Nuclear Structure Models & Methods-- (1992-)
663210 -- Ground-State Radioactivity-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
BOSONS
CALCULATION METHODS
COUPLING
DECAY
ELEMENTARY PARTICLES
HADRONS
HARTREE-FOCK METHOD
IMPULSE APPROXIMATION
MATHEMATICAL MODELS
MEAN-FIELD THEORY
MESONS
NUCLEAR DECAY
NUCLEAR MODELS
WALECKA MODEL