Fusion enhancement for neutron-rich isotopes of oxygen on carbon nuclei was probed. To measure the fusion cross section a ${}^{20}\mathrm{O}$ beam accelerated to $E_{\mathrm{lab}}/A=2.7$ MeV bombarded the active-target detector MuSIC@Indiana with a fill gas of ${\mathrm{CH}}_4$. Examination of the average fusion cross section over the interval $0.5\le (E_{\mathrm{c}.\mathrm{m}.}-V_B)/V_B\le 1.2$ for ${}^{16–20}\mathrm{O}+{}^{12}\mathrm{C}$ reveals that while even isotopes of oxygen exhibit essentially the same cross section, the cross section for odd isotopes can be either enhanced or suppressed relative to the even $A$ members of the isotopic chain. Theoretical models fail to explain the observed experimental results.

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• Low & intermediate energy heavy-ion reactions
• Nuclear fusion
• Nuclear reactions
• Unstable nuclei induced nuclear reactions