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International Conference on Frontiers in Nuclear Structures, Astrophysics and Reactions - FINUSTAR 2005, Isle of Kos : Grèce
Cross section measurements of the Big Bang nucleosynthesis reaction D($\alpha,gamma)^6Li$ by Coulomb dissociation of $^6Li$
F. Hammache1, 2, D. Galaviz, K. Sümmerer2, S. Typel2, F. Attallah2, M. Caamano, A. Coc3, D. Cortina, H. Geissel2, M. Hellström2, N. Iwasa, J. Kiener3, P. Koczon2, B. Kohlmeyer, E. Schwab2, K. Schwarz2, F. Schümann, P. Senger2, O. Sorlin1, V. Tatischeff3, J.P. Thibaud3, F. Uhlig2, A. Wagner, A. Walus

The possibility that big-bang nucleosynthesis (BBN) may produce nontrivial amounts of 6Li is under study since the recent observations of this element in old halo stars. However, the interpretation of these observations needs a precise knowledge of the reaction rate of D(alpha, gamma)6Li which, at present, is extremely uncertain (a factor of 20) at the energies of astrophysical interest (Ecm <= 300 keV). This uncertainty originates from difficulties in both theoretical estimates and experimental determinations of the D(alpha, gamma)6Li capture reaction cross section. New measurements of the cross section of D($\alpha, gamma$)6Li reaction using Coulomb dissociation of 6Li at 150 A MeV have been performed recently at GSI. The results will be compared to previous measurements and theoretical calculations.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  GSI - Gesellschaft für Schwerionenforschung mbH
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Physique Nucléaire Expérimentale