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The observed primordial 7Li abundance in metal-poor halo stars is found to belower than its Big-Bang nucleosynthesis (BBN) calculated value by a factor ofapproximately three. Some recent works suggested the possibility that thisdiscrepancy originates from missing resonant reactions which would destroy the7Be, parent of 7Li. The most promising candidate resonances which were foundinclude a possibly missed 1- or 2- narrow state around 15 MeV in the compoundnucleus 10C formed by 7Be+3He and a state close to 7.8 MeV in the compoundnucleus 11C formed by 7Be+4He. In this work, we studied the high excitationenergy region of 10C and the low excitation energy region in 11C via thereactions 10B(3He,t)10C and 11B(3He,t)11C, respectively, at the incident energyof 35 MeV. Our results for 10C do not support 7Be+3He as a possible solutionfor the 7Li problem. Concerning 11C results, the data show no new resonances inthe excitation energy region of interest and this excludes 7Be+4He reactionchannel as an explanation for the 7Li deficit.

Search for new resonant states in 10C and 11C and their impact on the cosmological lithium problem