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Structure studies of neutron-rich beryllium and carbon isotopes
Authors:H G Bohlen  W von Oertzen  R Kalpakchieva  B Gebauer  S M Grimes  T N Massey  H Lenske  A Lenz  M Milin  Ch Schulz  T Kokalova  S Torilov  S Thummerer
Institution:1. Hahn-Meitner-Institut GmbH, Glienicker Str. 100, 14109, Berlin, Germany
3. Flerov Laboratory of Nuclear Reactions, JINR, 141980, Dubna, Russia
5. Department of Physics and Astronomy, Ohio University, 45701-2979, Athens, Ohio, USA
6. Institut für Theoretische Physik, Universit?t Giessen, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
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 particlehole states of 16C using the 13C(12C,9C)16C reaction and found 14 previously unknown states.
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