Investigation of the C-14 + alpha molecular configuration in O-18 by means of transfer and sequential decay reaction

A multinucleon transfer and cluster-decay experiment, namely Be-9(C-13, O-18* -> C- 14 + alpha)alpha, was performed at a beam energy of 65 MeV. Resonant states in O-18 from 7 to 19 MeV, including some newly observed ones, are reconstructed with high resolution, based on the coincident detection of various combinations of the final fragments. The alpha-decay branching ratios for 14 states are extracted from both the invariant-mass and the missing-mass measurements. Angular correlation analysis was conducted for the 10.3-MeV (4(+)) state. The present work supports the existence of the positive-parity rotational band associated with the C-14 + alpha molecular structure in O-18, but the negative-parity band members were not identified.