engleski

Search for Cluster Structure of Excited States in 14C

We have studied three different 2n-transfer reactions on a 12C target and the 5He-transfer in the reaction 9Be(7Li, d)14C. Combined with a systematic search through experimental results for transfer reactions, inelastic excitations and other data, we have established an almost complete spectroscopy for 14C up to 18 MeV excitation. We identify states with single-particle structure with oblate shapes, and states connected to proton excitations. We identify two bands connected to triangular (oblate) cluster states. Further we list states of prolate shape which have no simple structure related to the low lying oblate states of 12C. These are proposed to form a parity inversion doublet, to have strong alpha-clustering, and to form rotational bands of high moment of inertia. Thus it is possible for the first time to identify chain states expected in the isotope 14C.

14C; cluster states; molceular states

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