Measurement of the {sup 13}C(α,n){sup 16}O reaction with the Trojan horse method: Focus on the sub threshold resonance at −3 keV

Journal Article · Fri May 02 04:00:00 EDT 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4874069· OSTI ID:22280460

La Cognata, M. ^[1]; Spitaleri, C.; Guardo, G. L.; Puglia, S. M. R.; Romano, S.; Spartà, R. ^[2]; Trippella, O. ^[3]; Kiss, G. G. ^[4]; Rogachev, G. V.; Avila, M.; Koshchiy, E.; Kuchera, A.; Santiago, D. ^[5]; Mukhamedzhanov, A. M. ^[6]; Lamia, L. ^[7]

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1. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Catania (Italy)
2. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Catania and Dipartimento di Fisica e Astronomia, Università di Catania, Catania (Italy)
3. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Catania and Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, and Dipartimento di Fisica, Università di Perugia, Perugia (Italy)
4. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Catania and Institute of Nuclear Research (ATOMKI), Debrecen (Hungary)
5. Department of Physics, Florida State University, Tallahassee, Florida (United States)
6. Cyclotron Institute, Texas A and M University, College Station, Texas (United States)
7. Dipartimento di Fisica e Astronomia, Università di Catania, Catania (Italy)

The {sup 13}C(α,n){sup 16}O reaction is the neutron source of the main component of the s-process. The astrophysical S(E)-factor is dominated by the −3 keV sub-threshold resonance due to the 6.356 MeV level in {sup 17}O. Its contribution is still controversial as extrapolations, e.g., through R-matrix calculations, and indirect techniques, such as the asymptotic normalization coefficient (ANC), yield inconsistent results. Therefore, we have applied the Trojan Horse Method (THM) to the {sup 13}C({sup 6}Li,n{sup 16}O)d reaction to measure its contribution. For the first time, the ANC for the 6.356 MeV level has been deduced through the THM, allowing to attain an unprecedented accuracy. Though a larger ANC for the 6.356 MeV level is measured, our experimental S(E) factor agrees with the most recent extrapolation in the literature in the 140-230 keV energy interval, the accuracy being greatly enhanced thanks to this innovative approach, merging together two well establish indirect techniques, namely, the THM and the ANC.

• OSTI ID: 22280460
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1594; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
ACCURACY
ALPHA REACTIONS
ASTROPHYSICS
ASYMPTOTIC SOLUTIONS
CALCULATION METHODS
CARBON 13 TARGET
COMPUTERIZED SIMULATION
COSMOLOGY
EXTRAPOLATION
KEV RANGE
LITHIUM 6 REACTIONS
MEV RANGE
NEUTRONS
NUCLEAR REACTION YIELD
OXYGEN 16
OXYGEN 17
R MATRIX
S PROCESS
SPECTROSCOPIC FACTORS