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Title: 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

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.
Authors:
; ; ;  [1] ;  [2] ;  [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)
Publication Date:
OSTI Identifier:
22391000
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1645; Journal 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)
Country of Publication:
United States
Language:
English
Subject:
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