Resonances in 19 Ne with relevance to the astrophysically important 18 F( p , a ) 15 O reaction
Resonances in 19 Ne with relevance to the astrophysically important 18 F( p , a ) 15 O reaction
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19 Ne 共振与天体物理学上重要的 18 F( p , a ) 15 O 反应相关
DOI：
10.1103/physrevc.85.022801
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发表时间：
2012
影响因子：
3.1
通讯作者：
Mountford D
中科院分区：
文献类型：
--
作者：
Mountford D
从新星观测到的最强的射线很可能来自与衰变相关的正电子湮没。这个原子核通过F(，)O反应的破坏率的不确定性限制了对未来任何观测到的射线通量的解释。在质心能量为0.5 MeV和1.9 MeV之间，直接测量了该反应和F()F反应的截面。用矩阵形式同时对两个数据集进行拟合，发现了几个共振现象，推论出的居民态参数与以前的测量结果基本一致。特别有趣的是，在F()F反应中观察到了1.3 MeV以上的额外强度，在F(，)O反应中观察到了1.3-1.7 MeV之间的额外强度。这可以用1/2态很好地描述，这与最近的理论预测和非弹性散射测量是一致的。讨论了宽的亚阈值伙伴对这一状态的天体物理含义。
The most intense-ray line observable from novae is likely to be from positron annihilation associated with the decay ofF. The uncertainty in the destruction rate of this nucleus through theF(,)O reaction presents a limit to interpretation of any future observed-ray flux. Direct measurements of the cross section of both this reaction and theF()F reaction have been performed between center of mass energies of 0.5 and 1.9 MeV. Simultaneous fits to both data sets with the-matrix formalism reveal several resonances, with the inferred parameters of populated states inNe in general agreement with previous measurements. Of particular interest, extra strength has been observed above1.3 MeV in theF()F reaction and between 1.3–1.7 MeV in theF(,)O reaction. This is well described by a broad 1/2state, consistent with both a recent theoretical prediction and an inelastic scattering measurement. The astrophysical implications of a broad subthreshold partner to this state are discussed.