Line-shape analysis of Doppler-broadened gamma lines following the beta decay of Li-11
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The decay of Li11 is studied at the TRIUMF Isotope Separation and Acceleration (ISAC) facility using the 8 -ray spectrometer coupled with an inner array of 20 plastic scintillators for detection. Doppler-broadened line shapes resulting from the decay of the excited states in Be10 populated by -delayed one-neutron emission are analyzed using Monte Carlo simulations. New -delayed neutron decay branches are shown to contribute to the complex decay of Li11. The half-lives of all but one bound excited state in Be10 are also deduced from this work. Among them, the half-life of the 2- state in Be10 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 Be10 is an excited halo state. The nature of the 8.82-MeV state in Be11 and its decay paths to excited states in Be10 are found to be consistent with the decay of the core proceeding through this particular state. 2009 The American Physical Society.
author list (cited authors)
Mattoon, C. M., Sarazin, F., Andreoiu, C., Andreyev, A. N., Austin, R., Ball, G. C., ... Svensson, C. E.
complete list of authors
Mattoon, CM||Sarazin, F||Andreoiu, C||Andreyev, AN||Austin, RAE||Ball, GC||Chakrawarthy, RS||Cross, D||Cunningham, ES||Daoud, J||Garrett, PE||Grinyer, GF||Hackman, G||Melconian, D||Morton, C||Pearson, C||Ressler, JJ||Schwarzenberg, J||Smith, MB||Svensson, CE