Molecular and cluster structures in 18O

Abstract

We have studied the multi-nucleon transfer reaction 12C ( 7Li ,p) at E lab = 44 MeV, populating states in the oxygen isotope 18O . The experiments were performed at the Tandem accelerator of the Maier-Leibniz Laboratory in Munich using the high-resolution Q3D magnetic spectrograph. States were populated up to an excitation energy of 21.2MeV with an overall energy resolution of 45keV, and 30 new states of 18O have been identified. The structure of the rotational bands observed is discussed in terms of cluster bands with the underlying cluster structures: 14C$ \(\displaystyle \otimes\) \(\displaystyle \alpha\)$and 12C ⊗ 2n ⊗ \( \alpha\) . Because of the broken intrinsic reflection symmetry in these structures the corresponding rotational bands appear as parity doublets.