Structure of light hypernuclei studied with three- and four-body models

One of the main purposes in hypernuclear physics is to obtain information on the hyperon-nucleon (YN) interaction. In this paper we intend to discuss on the spin-spin part of ΛN interaction by studying of the hypernuclear structure such as Λ4H, Λ4He, Λ3H, Λ6He, Λ6Li and Λ7Li. As the calculational method, we employ the variational method with the Jacobian-coordinate Gaussian basis functions which was developed by two of the authors (E.H. and M.K.) and their collaborators for precise computations of few-body systems. All the rearrangement channels are taken into account and the solutions are stable and reliable as has been confirmed in many applications. For example, one may refer to the previous study on halo structure of A=6-7 hypernuclei. (J.P.N.)