Direct measurement of the F 18 ( p , a ) O 15 reaction at nova temperatures
Direct measurement of the F 18 ( p , a ) O 15 reaction at nova temperatures
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直接测量新星温度下的 F 18 ( p , a ) O 15 反应
DOI：
10.1103/physrevc.83.042801
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发表时间：
2011
影响因子：
3.1
通讯作者：
Beer C
中科院分区：
文献类型：
--
作者：
Beer C
O反应速率对于了解新星模型预测的最终丰度至关重要。在新星爆发后的前几个小时的射线发射预计将占主导地位的511千电子伏湮灭光子的衰变，因此了解其生产可以提供重要的约束条件，在爆发期间的观察相比。结果是从最低能量的直接测量，到目前为止，在同位素分离器和加速器放射性束设施在TRIUMF实验室，加拿大。横截面的测量中心的质量能量为250，330，453，和673千电子伏，并与以前的数据和矩阵计算的结果进行比较。在新星爆炸的背景下，对整体反应速率的影响进行了讨论。
TheO reaction rate is crucial for understanding the final abundance ofpredicted by nova models. The-ray emission in the first few hours after a nova outburst is expected to be dominated by 511 keV annihilation photons from the decay of, and so understanding its production can provide important constraints on the conditions during the outburst when compared with observations. Results are presented from the lowest-energy direct measurement to date, performed at the Isotope Separator and Accelerator radioactive beam facility at the TRIUMF laboratory, Canada. Cross section measurements at center-of-mass energies of 250, 330, 453, and 673 keV are obtained and the results compared to previous data and-matrix calculations. The implications for the overall reaction rate in the context of nova explosions have been discussed.