Measurement of radiative proton capture on 18F and implications for oxygen-neon novae.
Measurement of radiative proton capture on 18F and implications for oxygen-neon novae.
复制标题
18F 辐射质子捕获的测量及其对氧氖新星的影响。
DOI：
10.1103/physrevlett.110.262502
复制
发表时间：
2013
影响因子：
8.6
通讯作者：
Akers C
中科院分区：
文献类型：
--
作者：
Akers C
反应速率影响新星中产生的射线可观测放射性同位素的最终丰度。然而，没有成功的测量这种反应存在和使用的速率计算从不完整的信息的贡献共振。在被认为起重要作用的两个共振中，一个具有从镜像核中假设的模拟态估计的辐射宽度。第二个没有一个模拟的状态分配在所有，导致在一个任意的辐射宽度被假定。在这里，我们报告的第一个成功的直接测量反应。发现665 keV共振的强度（）比目前在新星模型中假设的弱一个数量级以上。反应速率计算表明，这种共振因此在任何天体物理学的破坏中都没有发挥重要作用。<?format ?>能源
The rate of thereaction affects the final abundance of the-ray observable radioisotope, produced in novae. However, no successful measurement of this reaction exists and the rate used is calculated from incomplete information on the contributing resonances. Of the two resonances thought to play a significant role, one has a radiative width estimated from the assumed analogue state in the mirror nucleus,. The second does not have an analogue state assignment at all, resulting in an arbitrary radiative width being assumed. Here, we report the first successful direct measurement of thereaction. The strength of the 665 keV resonance () is found to be over an order of magnitude weaker than currently assumed in nova models. Reaction rate calculations show that this resonance therefore plays no significant role in the destruction ofat any astrophysical <?format ?>energy.