NAOC Open IR
thermonuclear19fp016oreactionrate
He Jianjun1; Lombardo Ivano2; DellAquila Daniele3; Xu Yi4; Zhang Liyong1; Liu Weiping5
2018
Source Publicationchinesephysicsc
ISSN1674-1137
Volume042Issue:001Pages:015001
AbstractThe thermonuclear^19F(p,α0)16O reaction rate in the temperature region 0.007–10 GK has been derived by re-evaluating the available experimental data, together with the low-energy theoretical R-matrix extrapolations.Our new rate deviates by up to about 30% compared to the previous results, although all rates are consistent within the uncertainties. At very low temperature(e.g. 0.01 GK) our reaction rate is about 20% lower than the most recently published rate, because of a difference in the low energy extrapolated S-factor and a more accurate estimate of the reduced mass used in the calculation of the reaction rate. At temperatures above ^1 GK, our rate is lower, for instance, by about 20% around 1.75 GK, because we have re-evaluated the previous data(Isoya et al., Nucl. Phys.7, 116(1958)) in a meticulous way. The present interpretation is supported by the direct experimental data. The uncertainties of the present evaluated rate are estimated to be about 20% in the temperature region below 0.2 GK,and are mainly caused by the lack of low-energy experimental data and the large uncertainties in the existing data.Asymptotic giant branch(AGB) stars evolve at temperatures below 0.2 GK, where the^19F(p,α)16O reaction may play a very important role. However, the current accuracy of the reaction rate is insufficient to help to describe, in a careful way, the fluorine over-abundances observed in AGB stars. Precise cross section(or S factor) data in the low energy region are therefore needed for astrophysical nucleosynthesis studies.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/42512
Collection中国科学院国家天文台
Affiliation1.中国科学院国家天文台
2.INFN - Sezione di Catania
3.Dip. di Fisica, Univ. di Napoli Federico II
4.Extreme Light Infrastructure - Nuclear Physics
5.中国原子能科学研究院
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
He Jianjun,Lombardo Ivano,DellAquila Daniele,et al. thermonuclear19fp016oreactionrate[J]. chinesephysicsc,2018,042(001):015001.
APA He Jianjun,Lombardo Ivano,DellAquila Daniele,Xu Yi,Zhang Liyong,&Liu Weiping.(2018).thermonuclear19fp016oreactionrate.chinesephysicsc,042(001),015001.
MLA He Jianjun,et al."thermonuclear19fp016oreactionrate".chinesephysicsc 042.001(2018):015001.
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