<i>Λ</i>-nucleus single-particle potentials

Data on the level spectra of \ensuremath{\Lambda} hypernuclei, obtained from (${\ensuremath{\pi}}^{+}$,${K}^{+}$) and (${K}^{\mathrm{\ensuremath{-}}}$,${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$) reaction studies, are analyzed to obtain a density-dependent and nonlocal \ensuremath{\Lambda}-nucleus potential. We relate our results to previous work which bears on the origin of the density dependence and nonlocality of the \ensuremath{\Lambda}-nucleus potential. We argue that the distinguishable \ensuremath{\Lambda} particle provides one of the best examples of single-particle shell structure in nuclear physics.