engleski

Cluster breakup of 18O and 22Ne

The 14C + α breakup of 18O has been studied at energies of Ebeam = 136 MeV and 148.5 MeV, using a 200 &micro ; ; g cm-2 thick Be target. Several states belonging to the proposed octupole deformed band, previously associated with the 8.04 MeV, 1- and 8.22 MeV, 2+ states, have been populated through inelastic excitation. A candidate for the 7- member was not found, providing evidence that the negative parity component of the band terminates at the 5- member. This is shown to be consistent with the Nilsson description of the systematics in the 16O, 18O and 20Ne nuclei. In addition, several states at Ex > 13 MeV in 18O have been measured to α -decay for the first time. The α -transfer reactions 9Be(18O, 12C 10Be)5He, 9Be(18O, 13C 9Be)5He and 9Be(18O, 18O 4He)5He were also measured ; however, little or no evidence for the population of states in 22Ne was found.

cluster states; 18O; 22Ne; rotational band; transfer reaction; breakup reaction

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