Hyperon properties in finite nuclei using realistic YN interactions

Single-particle energies of Lambda and Sigma hyperons in several nuclei are obtained from the relevant self-energies. The latter are constructed withi n the framework of a perturbative many-body approach employing present real istic hyperon-nucleon interactions such as the models of the Julich and Nij megen groups. The effects of the non-locality and energy dependence of the self-energy on the bound states are investigated. It is also shown that, al though the single-particle hyperon energies are well reproduced by local Wo ods-Saxon hyperon-nucleus potentials, the wave functions from the non-local self-energy are far more extended. Implications of this behavior for the m esonic weak decay of Lambda hypernuclei are discussed. (C) 1998 Published b y Elsevier Science B.V.