Cluster states in nuclei as representations of a U(n+1) group
  We propose a description of cluster states in nuclei in terms of representations of unitary algebras U(n+1), where n is the number of space degrees of freedom. Within this framework, a variety of situations including both vibrational and rotational spectra, soft and rigid configurations, identical and non-identical constituents can be described. As an example, we show how the method can be used to study alpha-clustering configurations in 12C with point group symmetry D(3h). 
R. Bijker (ICN-UNAM, Mexico) and F. Iachello (Yale)