CORRECTIONS TO THE SINGLE PARTICLE M1 AND GAMOW-TELLER MATRIX ELEMENTS
198331 pages
Published in:
- Nucl.Phys.A 399 (1983) 334-364
- Published: 1983
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Abstract: (Elsevier)
Consideration of second-order core-polarisation, isobar-current and meson-exchange-current processes gives a satisfactory understanding of the ground-state magnetic moments and mirror β-decay transition probabilities in closed-shell-plus- (or minus) one nuclei, A = 3, 15, 17, 39 and 41. Perturbation contributions from high-lying excited states (tensor correlations) from one-body and two-body meson-exchange operators cancel strongly in diagonal matrix elements, but in off-diagonal matrix elements between spin-orbit partners the cancellation is less. Similarly, with isobar currents, there is a strong cancellation between direct and exchange contributions in diagonal matrix elements, while the exchange term is suppressed in off-diagonal cases. Of the two contributions, tensor correlations are found to be as important as, if not more important than, isobar currents. The calculated lowest-order meson-exchange-current contributions to magnetic moments are close to the soft-pion limit predictions.- NUCLEUS: MAGNETIC MOMENT
- MAGNETIC MOMENT: NUCLEUS
- NUCLEUS: SEMILEPTONIC DECAY
- SEMILEPTONIC DECAY: NUCLEUS
- EFFECT: POLARIZATION
- POLARIZATION: EFFECT
- CURRENT: ISOBAR
- EXCHANGE: CURRENT
- CURRENT: EXCHANGE
- MESON: CURRENT
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