Eur. Phys. J. A (2010) 43: 17-33
https://doi.org/10.1140/epja/i2009-10894-2

Regular Article - Experimental Physics

Molecular and cluster structures in ¹⁸O

¹ Helmholtz-Zentrum Berlin, Glienicker Str. 100, D-14109, Berlin, Germany
² Physik Department E12, Technische Universität München, James-Franck-Str., D-85748, Garching, Germany
³ Sektion Physik, Universität München, Am Coulombwall 1, D-85748, Garching, Germany
⁴ Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, HR-10000, Zagreb, Croatia

^* e-mail: oertzen@helmholtz-berlin.de

Received: 3 September 2009
Revised: 15 October 2009
Accepted: 27 October 2009
Published online: 4 December 2009

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$ $and

12C ⊗ 2n ⊗ . Because of the broken intrinsic reflection symmetry in these structures the corresponding rotational bands appear as parity doublets.