Λ-nucleus single-particle potentials

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