Binding weakly interacting partners: a study of Ca–He2 and its isotopomers D. López-Durán, R. Rodríguez-Cantano, T. González-Lezana, G. Delgado-Barrio, P. Villarreal and F.A. Gianturco Eur. Phys. J. D, 66 7 (2012) 198 Published online: 26 July 2012 DOI: 10.1140/epjd/e2012-30202-6