期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
Thermonuclear ^19F(p,α0)^16O reaction rate 被引量:2
1
作者 何建军 Ivano Lombardo +3 位作者 Daniele Dell’Aquila 徐毅 张立勇 柳卫平 《Chinese Physics C》 SCIE CAS CSCD 2018年第1期135-144,共10页
The 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 extrapolation... The 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. 展开更多
关键词 asymptotic giant branch(AGB) star nucleosynthesis astrophysical S factor cross section reaction rate
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部