Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-12-03
Nucl.Phys. A726 (2003) 267-302
Physics
Nuclear Physics
Nuclear Theory
36 pages; LaTeX2e; 1 eps figure. Changes: 2 more tables and 14 new references added; effects on asymmetry parameter calculated
Scientific paper
10.1016/S0375-9474(03)01620-8
We derive in detail the transition potential for nonmesonic lambda-hypernuclear decay in a one-meson-exchange model involving the full pseudoscalar and vector meson octets and including two effects that have been systematically omitted in the literature. These are the kinematical effects due to the difference between the lambda and nucleon masses and the first-order nonlocality corrections. Numerical results for $^{12}_\Lambda$C and $^5_\Lambda$He are presented and they show that the combined kinematical plus nonlocal corrections have an appreciable influence on the partial decay rates. However, this is somewhat diminished in the main decay observables: the total nonmesonic rate, the neutron-to-proton branching ratio, and the asymmetry parameter. The latter two still cannot be reconciled with the available experimental data. The existing theoretical predictions for the sign of the asymmetry parameter in $^5_\Lambda$He are confirmed.
Barbero Cesar
Conti Cláudio de
Galeao Alfredo P.
Krmpotic Francisco
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