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Indirect study of the $^(13)$C($\alpha$,n)$^(16)$O reaction via the $^(13)$C($^(7)$Li,t)$^(17)$O transfer reaction
Pellegriti M.G., Hammache F., Roussel P., Audouin L., Beaumel D. et al
Physical Review C 77 (2008) 042801 - http://hal.in2p3.fr/in2p3-00276786
Physique/Physique Nucléaire Expérimentale
Indirect study of the $^{13}$C($\alpha$,n)$^{16}$O reaction via the $^{13}$C($^{7}$Li,t)$^{17}$O transfer reaction
M.G. Pellegriti1, F. Hammache1, Pierre Roussel ()1, L. Audouin1, D. Beaumel1, P. Descouvemont, S. Fortier1, L. Gaudefroy2, J. Kiener3, A. Lefebvre-Schuhl3, M. Stanoiu4, V. Tatischeff3, M. Vilmay1
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
http://www.ganil-spiral2.eu
CNRS : UPR3266 – IN2P3 – CEA : DSM/GANIL
Bvd Henri Becquerel - BP 55027 - 14076 CAEN CEDEX 5
France
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
http://www-csnsm.in2p3.fr/
CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud
batiments 104 et 108 - 91405 Orsay Campus
France
4 :  GSI - Gesellschaft für Schwerionenforschung mbH
http://www.gsi.de/index.html
Gesellschaft für Schwerionenforschung
Gesellschaft für Schwerionenforschung mbH, Planckstrasse 1, 64291 Darmstadt
Allemagne
The 13C(alpha,n)16O reaction is considered the main neutron source for the s process in low mass asymptotic giant branch (AGB) stars. In the Gamow peak, the cross section sensitively depends on the 1/2+ subthreshold state of 17O (Ex=6.356 MeV). In this work, we determined the astrophysical S factor through an evaluation of the alpha spectroscopic factor and the corresponding asymptotic normalization factor (ANC) of the 6.356 MeV state using the transfer reaction 13C(7Li,t)17O at two different incident energies. Our result confirms that the contribution of the 1/2+ state is dominant at astrophysical energies. Our reaction rate at T=0.09 GK is slightly lower than the value adopted in the Nuclear Astrophysics Compilation of REaction rates (NACRE), but two times larger than the one obtained in a recent ANC measurement.

Articles dans des revues avec comité de lecture
2008
Physical Review C (Phys. Rev. C)
Publisher American Physical Society
ISSN 0556-2813 (eISSN : 1089-490X)
77
042801

25.70.Hi, 25.55.Hp, 26.20.-f, 27.20.+n