One of the most puzzling problems in Nuclear Astrophysics is the "Cosmological Lithium Problem", i.e the discrepancy between the primordial abundance of7Li observed in metal poor halo stars [1], and the one predicted by Big Bang Nucleosynthesis (BBN). One of the reactions that could have an impact on the problem is7Be(n,p)7Li. Despite of the importance of this reaction in BBN, the cross-section has never been directly measured at the energies of interest for BBN. Taking advantage of the innovative features of the second experimental area at the n-TOF facility at CERN, an accurate measurement of7Be(n,p) cross section has been recently performed at n-TOF, with a pure7Be target produced by implantation of a7Be beam at ISOLDE. The experimental procedure, the setup used in the measurement and the results obtained so far will be here presented.
7Be(n,p) cross section measurement for the Cosmological Lithium Problem at the n-TOF facility at CERN
Lucia Anna, Damone;Barbagallo, M.;Mastromarco, M.;
2018-01-01
Abstract
One of the most puzzling problems in Nuclear Astrophysics is the "Cosmological Lithium Problem", i.e the discrepancy between the primordial abundance of7Li observed in metal poor halo stars [1], and the one predicted by Big Bang Nucleosynthesis (BBN). One of the reactions that could have an impact on the problem is7Be(n,p)7Li. Despite of the importance of this reaction in BBN, the cross-section has never been directly measured at the energies of interest for BBN. Taking advantage of the innovative features of the second experimental area at the n-TOF facility at CERN, an accurate measurement of7Be(n,p) cross section has been recently performed at n-TOF, with a pure7Be target produced by implantation of a7Be beam at ISOLDE. The experimental procedure, the setup used in the measurement and the results obtained so far will be here presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
