Helium breakup states in 10Be and 12Be

9 págs.; 9 figs.; 1 tab. ; PACS number(s): 21.10.Hw, 25.70.Ef, 21.60.Gx, 27.20.1n
The breakup of 10,12Be into He clusters has been studied using the p, 12C(12Be,6He,6He) and 12C(12Be,4He,6He) inelastic scattering and two neutron transfer reactions with a 378 MeV 12Be beam incident on 12C and (CH2)n targets. Evidence has been found for three new states in 10Be at excitation energies of 13.2, 14.8, and 16.1 MeV, which may be associated with a 4He+6He cluster structure. The evidence for He cluster states in 12Be in the excitation energy range 12 to 25 MeV is also discussed. ©2001 The American Physical Society
This work was funded by the EPSRC (U.K.) and the IN2P3- CNRS (France). Additional support was provided by the ALLIANCE program of the British Council and the Ministere des Affaires Etrangeres, and the Human Capital and Mobility Program of the European Community (Contract No. CHGECT94- 0056).