Indirect Study of {sup 13}C({alpha},n){sup 16}O

Journal Article · Sun Apr 06 04:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2916995· OSTI ID:21137004

Hammache, F; Pellegriti, M G; Roussel, P; Audouin, L; Beaumel, D; Fortier, S ^[1]; Kiener, J; Lefebvre-Schuhl, A; Tatischeff, V ^[2]; Descouvemont, P ^[3]; Gaudefroy, L ^[4]; Stanoui, M ^[5]

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1. IPN-Orsay, IN2P3-CNRS, Universite Paris XI, Orsay, 91406 (France)
2. CSNSM, IN2P3-CNRS, Universite Paris XI, Orsay, 91405 (France)
3. Physique Nucleaire Theorique et Physique Mathematique, ULB CP229, B-1050 Brussels (Belgium)
4. GANIL, IN2P3-CNRS, Caen (France)
5. GSI, Postfach 110552, D-64220, Darmstadt (Germany)

The reaction {sup 13}C({alpha},n){sup 16}O is considered as the main neutron source for s-process in low-mass asymptotic giant branch stars. At low energies of astrophysical interest, the contribution of the subthreshold state 6.356 MeV of {sup 17}O to the {sup 13}C({alpha},n){sup 16}O cross section should be taken into account. However, the results of previous studies of this contribution lead to different conclusions.Hence, we investigated the effect of this resonance on the astrophysical S-factor through a new precise measurement of the alpha spectroscopic factor, S{sub {alpha}}, of the 6.356 MeV state using the transfer reaction {sup 13}C({sup 7}Li,t){sup 17}O at two different incident energies. The measured angular distributions and the obtained spectroscopic factors will be presented as well as their impact on C({alpha},n){sup 16}O cross section and reaction rate.

• OSTI ID: 21137004
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1001; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ANGULAR DISTRIBUTION
ASTROPHYSICS
ASYMPTOTIC SOLUTIONS
CARBON 13 TARGET
CROSS SECTIONS
GIANT STARS
LITHIUM 7 REACTIONS
MEV RANGE
NEUTRON SOURCES
NUCLEOSYNTHESIS
OXYGEN 16
OXYGEN 17
S PROCESS
SPECTROSCOPIC FACTORS
TRANSFER REACTIONS