Search for resonant states in C-10 and C-11 and their impact on the primordial Li-7 abundance

0490018 - ÚJF 2019 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Hammache, F. - Coc, A. - de Sereville, N. - Stefan, I. - Roussel, P. - Assie, M. - Audouin, L. - Beaumel, D. - Franchoo, S. - Fernandez-Dominguez, B. - Fox, S. - Hamadache, C. - Kiener, J. - Laird, A. - Le Crom, B. - Lefebvre-Schuhl, A. - Lefebvre, L. - Matea, I. - Matta, A. - Mavilla, G. - Mrázek, Jaromír - Morfouace, P. - de Oliveira Santos, F. - Parikh, A. - Perrot, L. - Sanchez-Benitez, A. M. - Suzuki, D. - Tatischeff, V. - Ujic, P. - Vandebrouck, M.
Search for resonant states in C-10 and C-11 and their impact on the primordial Li-7 abundance.
Journal of Physics Conference Series. Vol. 940. Bristol: IOP Publishing, 2018, č. článku UNSP 012016. ISSN 1742-6588.
[7th Conference on Nuclear Physics in Astrophysics (NPA). York (GB), 18.05.2015-22.05.2015]
Grant CEP: GA MŠMT LM2015076
Institucionální podpora: RVO:61389005
Klíčová slova: C-10 and C-11 states * nucleosynthesis * production and destruction
Obor OECD: Astronomy (including astrophysics,space science)

The cosmological Li-7 problem arises from the significant discrepancy of about a factor 3 between the predicted primordial Li-7 abundance and the observed one. The main process for the production of Li-7 during Big-Bang nucleosynthesis is the decay of Be-7. Many key nuclear reactions involved in the production and destruction of Be-7 were investigated in attempt to explain the Li-7 deficit but none of them led to successful conclusions. However, some authors suggested recently the possibility that the destruction of Be-7 by He-3 and He-4 may reconcile the predictions and observations if missing resonant states in the compound nuclei C-10 and C-11 exist. Hence, a search of these missing resonant states in C-10 and C-11 was investigated at the Orsay Tandem-Alto facility through B-10(He-3,t)C-10 and B-11(He-3,t)C-11 charge-exchange reactions respectively. After a short overview of the cosmological Li-7 problem from a nuclear physics point of view, a description of the Orsay experiment will be given as well as the obtained results and their impact on the Li-7 problem.
Trvalý link: http://hdl.handle.net/11104/0284314