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  Bohlen H.G. ; von Oertzen W. ; Kalpakchieva R. ; Gebauer B. ; Grimes S.M. ; Massey T.N. ; Lenske H. ; Lenz A. ; Milin M. ; Schulz Ch. ; Kokalowa T. ; Torilov S. ; Thummerer S.: Structure studies of neutron-rich beryllium and carbon isotopes. In: Jolos J. [Ed.] : Nuclear clusters : from light to superheavy nuclei ; symposium, 5 - 9 August, 2002, Rauischholzhausen, GermanyDebrecen: EP Systema, 2003. - ISBN 963-206-299-X, p. 53-58

Abstract:
The structure of neutron-rich beryllium isotopes has been investigated using different heavy-ion induced transfer reactions. A strong sensitivity to the chosen core nucleus is found for the cores of ⁹Be and ¹⁰Be, respectively. With a ⁹Be core, molecular rotational bands up to high excitation energies are observed due to the pronounced 2α-cluster structure, whereas only few states at low excitation energies are populated with a ¹⁰Be core. For ¹¹Be a detailed investigation has been performed for the three states at 3.41~MeV, 3.89~MeV and 3.96~MeV, which resulted in the most probable spin-parity assignments 3/2⁺, 5/2^- and 3/2^-, respectively. Furthermore we have studied particle-hole states of ¹⁶C using the ¹³C(¹²C,⁹C)¹⁶C reaction and found 14 previously unknown states.