Indirect study of the {sup 13}C({alpha},n){sup 16}O reaction via the {sup 13}C({sup 7}Li,t){sup 17}O transfer reaction

Journal Article · Tue Apr 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.042801· OSTI ID:21189889

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

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

The {sup 13}C({alpha},n){sup 16}O 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{sup +} subthreshold state of {sup 17}O (E{sub x}=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 {sup 13}C({sup 7}Li,t){sup 17}O at two different incident energies. Our result confirms that the contribution of the 1/2{sup +} 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.

• OSTI ID: 21189889
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 77, Issue 4; Other Information: DOI: 10.1103/PhysRevC.77.042801; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ASTROPHYSICS
ASYMPTOTIC SOLUTIONS
CARBON 13
CARBON 13 TARGET
CROSS SECTIONS
GAMOW BARRIER
LITHIUM 7
MASS
MEV RANGE 01-10
NEUTRON EMISSION
NEUTRON SOURCES
NUCLEAR REACTIONS
OXYGEN 16
OXYGEN 17
REACTION KINETICS
S PROCESS
SPECTROSCOPIC FACTORS
STARS
TRANSFER REACTIONS