Elsevier

Nuclear Physics A

Volume 333, Issue 2, 14 January 1980, Pages 273-284
Nuclear Physics A

Fusion cross section for 13C + 13C at low energies

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Abstract

The energy dependence of the fusion cross section has been measured over the range Ec.m. = 3.05–6.88 MeV by detecting the γ-rays from residual nuclei in a 4π geometry. Analyzing the 1.37 MeV photopeak, originating from 24Mg 1.37 MeVg.s. transition, the cross sections for 24Mg+2n channel were also deduced. The measured fusion cross sections have been compared with those for 12C + 12C and 12C + 13C systems and found to be significantly different. For 13C+13C the fusion cross sections agree with the standard optical-model prediction down to the lowest measured energies, while for 12C + 12C and 12C + 13C they are, at the lowest energies, too low. It is suggested that the unpaired valence nucleons facilitate fusion at energies well below the Coulomb barrier.

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On leave of absence from the Saha Institute of Nuclear Physics, Calcutta, India.

††

Permanenet address.

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