The influence of collective neutrino oscillations on a supernova r process
The influence of collective neutrino oscillations on a supernova r process
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集体中微子振荡对超新星过程的影响
DOI：
10.1088/0954-3899/38/3/035201
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Surman
中科院分区：
文献类型：
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作者：
H. Duan;A. Friedland;G. McLaughlin;R. Surman
最近，已经证明超新星中的中微子会集体振荡。这个过程比传统的物质诱导的米赫耶夫-斯米尔诺夫-德军总部效应发生得更深，因此可能对核合成产生影响。在本文中，我们利用代表性的晚期中微子谱和流出模型探讨了集体中微子振荡对 r 过程的影响。我们发现集体振荡的准确建模对于这种分析至关重要。作为一个例子，经常使用的“单角度”近似对我们设置中的产量做出了非常不准确的预测。通过适当的多角度处理，振荡的影响不那么剧烈，但仍然很重要。由于振荡模式对发射通量的细节和中微子质量等级的符号很敏感，因此 r 过程产率也很敏感。影响的大小还敏感地取决于天体物理条件，特别是原子核开始大量存在的时间与集体振荡开始的时间之间的相互作用。有必要对天体物理条件进行更明确的了解，并对这些条件下的集体振荡进行准确的建模。
Recently, it has been demonstrated that neutrinos in a supernova oscillate collectively. This process occurs much deeper than the conventional matter-induced Mikheyev–Smirnov–Wolfenstein effect and hence may have an impact on nucleosynthesis. In this paper we explore the effects of collective neutrino oscillations on the r-process, using representative late-time neutrino spectra and outflow models. We find that accurate modeling of the collective oscillations is essential for this analysis. As an illustration, the often-used 'single-angle' approximation makes grossly inaccurate predictions for the yields in our setup. With the proper multiangle treatment, the effect of the oscillations is found to be less dramatic, but still significant. Since the oscillation patterns are sensitive to the details of the emitted fluxes and the sign of the neutrino mass hierarchy, so are the r-process yields. The magnitude of the effect also depends sensitively on the astrophysical conditions—in particular on the interplay between the time when nuclei begin to exist in significant numbers and the time when the collective oscillation begins. A more definitive understanding of the astrophysical conditions, and accurate modeling of the collective oscillations for those conditions, is necessary.