Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1995-04-07
Nucl.Phys. A609 (1996) 437-453
Physics
Nuclear Physics
Nuclear Theory
23 pages, RevTeX format, 5 PostScript figures available on request
Scientific paper
10.1016/S0375-9474(96)00276-X
We study the contribution of two-body meson-exchange processes to axial charge transitions for nuclei in the lead, tin and oxygen regions. We conduct calculations in the Dirac-Hartree (the Walecka model) and the relativistic Hartree (where the full one-nucleon-loop effects are included) approximations. We present results indicating that one- and two-body processes enhance the matrix elements of the axial-charge operator by some (100+-20)% in all three regions studied. This agrees well with the fit of eighteen first-forbidden beta-decay transitions conducted by Warburton in the lead region. We also discuss some sensitivities present in the calculation.
Barenboim Gabriela
Gattone A. O.
Izquierdo E. D.
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