Particle decay of (12)Be excited states

The breakup of E/A=50 MeV (12)Be fragments following inelastic scattering off of hydrogen and carbon target nuclei has been studied. The breakup channels alpha+(8)He, (6)He+(6)He, t+(9)Li, and p+(11)Li were observed. Two doublets at excitation energies of 12.8 and 15.5 MeV were found for the alpha+(8)He channel. A low-energy shoulder in the excitation-energy spectra at 10.2 MeV indicates one or more additional states. This work could not confirm the presence of (6)He-(6)He rotational structure reported by Freer [Phys. Rev. C 63, 034301 (2001)], although possible peaks at excitation energies of 13.5 and 14.5 MeV were found for (6)He+(6)He decay. Significant structure is observed in the excitation-energy spectrum for p+(11)Li at 25-30 MeV which maybe associated with T=3 analog states.