F-19(p, alpha)O-16 and F-19(alpha,p)Ne-22 Reaction Rate Measured via THM and Fluorine Nucleosynthesis in AGB stars

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00517766" target="_blank" >RIV/61389005:_____/19:00517766 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1742-6596/1308/1/012016" target="_blank" >http://dx.doi.org/10.1088/1742-6596/1308/1/012016</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/1308/1/012016" target="_blank" >10.1088/1742-6596/1308/1/012016</a>

Jazyk výsledku

angličtina

Název v původním jazyce

F-19(p, alpha)O-16 and F-19(alpha,p)Ne-22 Reaction Rate Measured via THM and Fluorine Nucleosynthesis in AGB stars

Popis výsledku v původním jazyce

Asymptotic Giant Branch (AGB) stars have been proven to be sites of F production through spectroscopy observations by several authors, but it is not clear whether these stars might account for the total fluorine abundance of the Galaxy. Recently the two main channels for 19F destruction in AGB stars, namely the 19F(alpha,p)22Ne and 19F(p,alpha)16O reactions, have been studied via the Trojan Horse Method in the energy range of interest for astrophysics. In both cases experimental results have shown the presence of resonant structures below 500 keV, hinting to an enhancements in efficiency of fluorine destruction by stellar H- and He- burning. In particular the 19F(p, alpha)16O reaction rate at T 9 ≤ 0.2K turns out to be increased up to a factor of 1.7 while the 19F(p, alpha)16O is enhanced more than a factor of 4 at 0.1 ≤ T 9 ≤ 0.25. We present here a re-analysis of the role of AGB stars as fluorine galactic source by comparing stellar observations with predictions of AGB nucleosynthesis (for stellar masses from 1.5 to 5Mo) computed by employing in state-of-the-art models the THM reaction rates for 19F destruction.

Název v anglickém jazyce

F-19(p, alpha)O-16 and F-19(alpha,p)Ne-22 Reaction Rate Measured via THM and Fluorine Nucleosynthesis in AGB stars

Popis výsledku anglicky

Asymptotic Giant Branch (AGB) stars have been proven to be sites of F production through spectroscopy observations by several authors, but it is not clear whether these stars might account for the total fluorine abundance of the Galaxy. Recently the two main channels for 19F destruction in AGB stars, namely the 19F(alpha,p)22Ne and 19F(p,alpha)16O reactions, have been studied via the Trojan Horse Method in the energy range of interest for astrophysics. In both cases experimental results have shown the presence of resonant structures below 500 keV, hinting to an enhancements in efficiency of fluorine destruction by stellar H- and He- burning. In particular the 19F(p, alpha)16O reaction rate at T 9 ≤ 0.2K turns out to be increased up to a factor of 1.7 while the 19F(p, alpha)16O is enhanced more than a factor of 4 at 0.1 ≤ T 9 ≤ 0.25. We present here a re-analysis of the role of AGB stars as fluorine galactic source by comparing stellar observations with predictions of AGB nucleosynthesis (for stellar masses from 1.5 to 5Mo) computed by employing in state-of-the-art models the THM reaction rates for 19F destruction.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Journal of Physics: Conference Series

ISBN

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ISSN

1742-6588

e-ISSN

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Počet stran výsledku

6

Strana od-do

012016

Název nakladatele

Institute of Physics Publishing

Místo vydání

Bristol

Místo konání akce

Morelos

Datum konání akce

7. 1. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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