Abstract : The cosmological 7Li problem arises from the significant discrepancy of about a factor 3 between the predicted
primordial 7Li abundance and the observed one [1]. The main process for the production of 7Li during Big-Bang
nucleosynthesis is the decay of 7Be. Many key nuclear reactions involved in the production and destruction of 7Be
were investigated in attempt to explain the 7Li deficit but none of them led to successful conclusions. However,
some authors suggested recently the possibility that the destruction of 7Be by 3He and 4He may reconcile the
predictions and observations if missing resonant states in the compound nuclei 10C and 11C exist [2]. Hence, a search of these missing resonant states in 10C and 11C was investigated at the Orsay Tandem-Alto facility through
10B(3He,t)10C and 11B(3He,t)11C charge-exchange reactions respectively.
After a short overview of the cosmological 7Li problem from a nuclear physics point of view, the Orsay experiment as
well as the obtained results and their impact on the 7Li problem [3] will be presented.
http://hal.in2p3.fr/in2p3-01266269
Contributor : Michel Lion
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Submitted on : Tuesday, February 2, 2016 - 1:16:31 PM
Last modification on : Tuesday, February 19, 2019 - 11:10:11 AM
F. Hammache, A. Coc, N. De Séréville, I. Stefan, P. Roussel, et al.. Search for resonant states in 10C and 11C and their impact on the primordial 7Li abundance
. Nuclear Physics in Astrophysics VII - 28th EPS Nuclear Physics Divisional Conference, May 2015, York, United Kingdom. ⟨in2p3-01266269⟩
