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We have studied the fusion of 11 Be with 209 Bi and 15 C with 232 Th in the energy region around the barrier within the framework of quantum diffusion approach and have found enhancement in fusion cross-section in deep sub-barrier region and a very minor suppression in the above barrier energy region with respect to the corresponding experimental observations. The fusion cross-section is found to be slightly increased for reactions involving 11 Be and 15 C nuclei in comparison to those involving the stable 10 Be and 12 C isotopes, respectively.

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