Cluster models of ΛΛ6He and Λ9Be hypernuclei

Configuration space Faddeev calculations are performed for the binding energy of He-6(LambdaLambda) and Be-9(Lambda) bound states, here considered as alphaLambdaLambda and alphaalphaLambda clusters respectively, in order to study the dependence of the calculated binding energy on the alphaLambda potential input. For He-6(LambdaLambda), using realistic interactions, the uncertainty in extracting the LambdaLambda S-1(0) interaction strength does not exceed 0.1 MeV, which is a fraction of the order of magnitude derived for other theoretical uncertainties. For Be-9(Lambda), the dependence of the calculated binding energy on the alphaLambda potential is considerably larger, of order 1 MeV. Our results for Be-9(Lambda) suggest that the odd-state alphaLambda interaction is substantially reduced with respect to the even-state component. (C) 2004 Elsevier B.V. All rights reserved.