Abstract
The beta decay of Li-11 is studied at the TRIUMF Isotope Separation and Acceleration (ISAC) facility using the 8 pi gamma-ray spectrometer coupled with an inner array of 20 plastic scintillators for beta detection. Doppler-broadened line shapes resulting from the decay of the excited states in Be-10 populated by beta-delayed one-neutron emission are analyzed using Monte Carlo simulations. New beta-delayed neutron decay branches are shown to contribute to the complex decay of Li-11. The half-lives of all but one bound excited state in Be-10 are also deduced from this work. Among them, the half-life of the 2(-) state in Be-10 is shown to be much shorter than previously thought, yielding a new experimental B(E1) now well within the range of theoretical predictions and providing further evidence that the 2(-) state in Be-10 is an excited halo state. The nature of the 8.82-MeV state in Be-11 and its decay paths to excited states in Be-10 are found to be consistent with the beta decay of the core proceeding through this particular state.
Original language | English |
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Article number | ARTN 034318 |
Number of pages | 13 |
Journal | Physical Review C |
Volume | 80 |
Issue number | 3 |
DOIs | |
Publication status | Published - 23 Sep 2009 |
Keywords
- LIGHT-NUCLEI
- SPECTROSCOPY
- ENERGY-LEVELS
- RADII
- BE-11
- POLARIZED LI-11
- INTERACTION CROSS-SECTIONS
- HALO STRUCTURE
- 18 MEV STATE