Shell model and band structures in O-19

We have studied the reaction Li-7, p) on C-13 targets at E (lab) = 44 MeV, populating states in the oxygen isotope O-19 . The experiments were performed at the Tandem Laboratory (Maier-Leibniz Laboratorium) using the high-resolution Q3D magnetic spectrometer. States were populated up to an excitation energy of 21MeV, with an overall energy resolution of 45keV. We discuss shell model states and cluster bands related to the rotational bands in the O-18 -isotope, using the weak-coupling approach. Similar to O-18 , the broken intrinsic reflection symmetry in these states must give rise to rotational bands as parity doublets, so two K = 3/2 bands (parities, + and - are proposed with large moments of inertia. These are discussed in terms of an underlying cluster structure,(C-14 circle times n circle times alpha). An extended molecular binding diagram is proposed which includes the C-14-cluster.