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  Haigh, P.J.; Freer, M.; Ashwood, N.I.; Bloxham, T.; Curtis, N.; McEwan, P.; Bohlen, H.G.; Dorsch, T.; Kokalova, Tz.; Schulz, Ch.; Wheldon, C.: Neutron decay widths of excited states of ¹¹Be. Physical Review C 79 (2009), p. 014302/1-9

10.1103/PhysRevC.79.014302

Abstract:
The two-neutron transfer reaction ⁹Be(¹⁶O,¹⁴C)¹¹Be[¹⁰Be+n] has been used to measure the branching ratios for the neutron decay of excited states of ¹¹Be. The ¹⁴O ejectile was detected by a Q3D spectrometer at foreward angles. The energies and angles of the ¹⁰Be fragments of the decaying ¹¹Be^* recoil were measured in coincidence with the ¹⁴O ejectile using a double-sided silicon strip detector array at backward angles. This enabled a kinematic reconstruction of the reaction to be performed. Theoretical decay branch ratios were calculated using barrier penetrability factors and were compared to the measured ratios to provide information on the relative reduced widths of the states. The decay widths have been used to link states in ¹¹Be with a common structure and structurally to states in the daughter nucleus ¹⁰Be. the 3/2^- 8.82-MeV state was identified as a candidate for a molecular band head.