The AGB star nucleosynthesis in the light of the recent {sup 17}O(p,α){sup 14}N and {sup 18}O(p,α){sup 15}N reaction rate determinations

Journal Article · Tue Feb 24 00:00:00 EST 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4909605· OSTI ID:22391000

Palmerini, S.; Sergi, M. L.; La Cognata, M.; Pizzone, R. G. ^[1]; Lamia, L. ^[2]; Spitaleri, C. ^[3]

---

1. INFN-Laboratori Nazionali del Sud, Catania (Italy)
2. Dipartimento di Fisica e Astronomia, Universitá degli Studi di Catania (Italy)
3. INFN-Laboratori Nazionali del Sud, Catania, Italy and Dipartimento di Fisica e Astronomia, Universitá degli Studi di Catania (Italy)

Presolar grains form in the cold and dusty envelopes of Asymptotic Giant Branch (AGB) stars. These solides, once that have been ejected by stellar winds, come to us as inclusions in meteorites providing invaluable benchmarks and constraints for our knowledge of low temeperature H-burning in stars. The Trojan Horse Method (THM) has been used to investigate the low-energy cross sections of the {sup 17}O(p,α){sup 14}N and {sup 18}O(p,α){sup 15}N reactions. Moreover, the strength of the 65 keV resonance in the {sup 17}O(p,α){sup 14}N reaction, measured by means of the THM, has been used to renormalize the corresponding resonance strength in the {sup 17}O+p radiative capture channel. The new estimates of the reaction rates have been introduced into calculations of AGB star nucleosynthesis and the results have been compared with geochemical analysis of 'presolar' grains to determine their impact on astrophysical environments.

• OSTI ID: 22391000
• Journal Information: AIP Conference Proceedings, Vol. 1645, Issue 1; Conference: Carpathian Summer School of Physics 2014, Sinaia (Romania), 13-26 Jul 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMPTOTIC SOLUTIONS
BENCHMARKS
CAPTURE
COMPARATIVE EVALUATIONS
CROSS SECTIONS
GIANT STARS
KEV RANGE
LIMITING VALUES
METEORITES
NITROGEN 14
NITROGEN 15
NUCLEOSYNTHESIS
OXYGEN 17 TARGET
OXYGEN 18 TARGET
PROTON REACTIONS
REACTION KINETICS
RENORMALIZATION
STELLAR WINDS