Neutron decay widths of excited states of {sup 11}Be

• Published in: Physical review. C, Nuclear physics Nuclear physics, 2009-01, Vol.79 (1)
• Main Authors: 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., Hahn-Meitner-Institut, Glienicker Strasse 100, D-14109 Berlin
• Format: Article
• Language: English
• Subjects: BERYLLIUM 10; BERYLLIUM 11; BERYLLIUM 9; BRANCHING RATIO; DAUGHTER PRODUCTS; DECAY; EXCITED STATES; MEV RANGE; NEUTRON REACTIONS; NEUTRON TRANSFER; NEUTRONS; NUCLEAR PHYSICS AND RADIATION PHYSICS; OXYGEN 14; OXYGEN 16; RECOILS; SILICON; SPECTROMETERS; TRANSFER REACTIONS
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PHYSREVC.79.014302

The two-neutron transfer reaction {sup 9}Be({sup 16}O, {sup 14}O){sup 11}Be[{sup 10}Be +n] has been used to measure the branching ratios for the neutron decay of excited states of {sup 11}Be. The {sup 14}O ejectile was detected by a Q3D spectrometer at forward angles. The energies and angles of the {sup 10}Be fragments of the decaying {sup 11}Be* recoil were measured in coincidence with the {sup 14}O 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 {sup 11}Be with a common structure and structurally to states in the daughter nucleus {sup 10}Be. The 3/2{sup -} 8.82-MeV state was identified as a candidate for a molecular band head.