Fusion reactions with the one-neutron halo nucleus 15C

摘要

The structure of 15C, with an s1/2 neutron weakly bound to a closed-neutronshell nucleus 14C, makes it a prime candidate for a one-neutron halo nucleus.We have for the first time studied the cross section for the fusion-fissionreaction 15C + 232Th at energies in the vicinity of the Coulomb barrier andcompared it to the yield of the neighboring 14C + 232Th system measured in thesame experiment. At sub-barrier energies, an enhancement of the fusion yield byfactors of 2-5 was observed for 15C, while the cross sections for 14C match thetrends measured for 12,13C.