Resonances in C 14 observed in the He 4 ( 10 Be , α ) Be 10 reaction

The alpha(Be-10, alpha)Be-10 resonant scattering reaction has been measured at nine Be-10 beam energies from 25 to 48 MeV, scanning out resonances in C-14 from excitation energies of 13 to 24 MeV. Angular distribution measurements were used to assign the spin and parity of 5-to resonances at E-x = 18.82(2) and 19.67(2) MeV and 6(+) at E-x = 20.80(2) MeV. The data also strongly indicate a 3(-) resonance at 17.32(2) MeV. The systematic uncertainty on the excitation energies is 175 keV. An R-matrix analysis has been performed for the excitation energy range 16.5 to 22 MeV. The data are discussed in terms of cluster bands in C-14.