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Title: The fluorine destruction in stars: First experimental study of the {sup 19}F(p,{alpha}){sup 16}O reaction at astrophysical energies

Abstract

The {sup 19}F(p,{alpha}){sup 16}O reaction is an important fluorine destruction channel in the proton-rich outer layers of asymptotic giant branch (AGB) stars and it might also play a role in hydrogendeficient post-AGB star nucleosynthesis. So far, available direct measurements do not reach the energy region of astrophysical interest (E{sub cm}{approx} 300 keV), because of the hindrance effect of the Coulomb barrier. The Trojan Horse (TH) method was thus used to access this energy region, by extracting the quasi-free contribution to the {sup 2}H({sup 19}F,{alpha}{sup 16}O)n reaction. The TH measurement of the {alpha}{sub 0} channel, which is the dominant one at such energies, shows the presence of resonant structures not observed before that cause an increase of the reaction rate at astrophysical temperatures up to a factor of 1.7, with potential important consequences for stellar nucleosynthesis.

Authors:
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  1. INFN-LNS, Catania (Italy)
Publication Date:
OSTI Identifier:
22075792
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1484; Journal Issue: 1; Conference: Conference on origin of matter and evolution of galaxies 2011, Wako (Japan), 14-17 Nov 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASTROPHYSICS; ASYMPTOTIC SOLUTIONS; COULOMB FIELD; DEUTERIUM TARGET; DIRECT REACTIONS; FLUORINE 19 REACTIONS; FLUORINE 19 TARGET; GIANT STARS; KEV RANGE; NUCLEAR REACTION KINETICS; NUCLEOSYNTHESIS; OXYGEN 16; POTENTIALS; PROTON REACTIONS; PROTON-NUCLEON INTERACTIONS

Citation Formats

La Cognata, M, Mukhamedzhanov, A, Spitaleri, C, Indelicato, I, Aliotta, M, Burjan, V, Cherubini, S, Coc, A, Gulino, M, Hons, Z, Kiss, G G, Kroha, V, Lamia, L, Mrazek, J, Palmerini, S, Piskor, S, Pizzone, R G, Puglia, S M. R., Rapisarda, G G, Romano, S, Cyclotron Institute, Texas A and M University, College Station, Texas, University of Catania and INFN-LNS, Catania, and others, and. The fluorine destruction in stars: First experimental study of the {sup 19}F(p,{alpha}){sup 16}O reaction at astrophysical energies. United States: N. p., 2012. Web. doi:10.1063/1.4763456.
La Cognata, M, Mukhamedzhanov, A, Spitaleri, C, Indelicato, I, Aliotta, M, Burjan, V, Cherubini, S, Coc, A, Gulino, M, Hons, Z, Kiss, G G, Kroha, V, Lamia, L, Mrazek, J, Palmerini, S, Piskor, S, Pizzone, R G, Puglia, S M. R., Rapisarda, G G, Romano, S, Cyclotron Institute, Texas A and M University, College Station, Texas, University of Catania and INFN-LNS, Catania, & others, and. The fluorine destruction in stars: First experimental study of the {sup 19}F(p,{alpha}){sup 16}O reaction at astrophysical energies. United States. https://doi.org/10.1063/1.4763456
La Cognata, M, Mukhamedzhanov, A, Spitaleri, C, Indelicato, I, Aliotta, M, Burjan, V, Cherubini, S, Coc, A, Gulino, M, Hons, Z, Kiss, G G, Kroha, V, Lamia, L, Mrazek, J, Palmerini, S, Piskor, S, Pizzone, R G, Puglia, S M. R., Rapisarda, G G, Romano, S, Cyclotron Institute, Texas A and M University, College Station, Texas, University of Catania and INFN-LNS, Catania, and others, and. 2012. "The fluorine destruction in stars: First experimental study of the {sup 19}F(p,{alpha}){sup 16}O reaction at astrophysical energies". United States. https://doi.org/10.1063/1.4763456.
@article{osti_22075792,
title = {The fluorine destruction in stars: First experimental study of the {sup 19}F(p,{alpha}){sup 16}O reaction at astrophysical energies},
author = {La Cognata, M and Mukhamedzhanov, A and Spitaleri, C and Indelicato, I and Aliotta, M and Burjan, V and Cherubini, S and Coc, A and Gulino, M and Hons, Z and Kiss, G G and Kroha, V and Lamia, L and Mrazek, J and Palmerini, S and Piskor, S and Pizzone, R G and Puglia, S M. R. and Rapisarda, G G and Romano, S and Cyclotron Institute, Texas A and M University, College Station, Texas and University of Catania and INFN-LNS, Catania and others, and},
abstractNote = {The {sup 19}F(p,{alpha}){sup 16}O reaction is an important fluorine destruction channel in the proton-rich outer layers of asymptotic giant branch (AGB) stars and it might also play a role in hydrogendeficient post-AGB star nucleosynthesis. So far, available direct measurements do not reach the energy region of astrophysical interest (E{sub cm}{approx} 300 keV), because of the hindrance effect of the Coulomb barrier. The Trojan Horse (TH) method was thus used to access this energy region, by extracting the quasi-free contribution to the {sup 2}H({sup 19}F,{alpha}{sup 16}O)n reaction. The TH measurement of the {alpha}{sub 0} channel, which is the dominant one at such energies, shows the presence of resonant structures not observed before that cause an increase of the reaction rate at astrophysical temperatures up to a factor of 1.7, with potential important consequences for stellar nucleosynthesis.},
doi = {10.1063/1.4763456},
url = {https://www.osti.gov/biblio/22075792}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1484,
place = {United States},
year = {Mon Nov 12 00:00:00 EST 2012},
month = {Mon Nov 12 00:00:00 EST 2012}
}