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arXiv 1607.01448astro-ph.HEnucl-th
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高温天体物理环境中的核中微子能谱

Nuclear neutrino energy spectra in high temperature astrophysical environments

G. Wendell Misch, George M. Fuller

摘要:

当天体物理环境的温度超过$\sim$ 100 keV时,中微子的能量会通过等离子体过程和核弱相互作用而大量损失。我们发现,核过程可能产生最高能量的中微子。重要的弱核相互作用包括带电电流通道(电子捕获/发射和正电子捕获/发射)和中性电流通道(通过中微子对发射的核去激发)。我们表明,为了作出一个现实的预测的核中微子光谱,必须考虑到原子核结构,在某些情况下,最重要的过渡可能涉及激发态,可能在父母和女儿的核。我们发现,标准的技术,生产中微子能谱,通过使用一个单一的过渡与Q值和矩阵元素选择,以适应公布的中微子生产率和能量损失将不能准确地捕捉重要的光谱特征。

英文摘要:

Astrophysical environments that reach temperatures greater than $\sim$ 100 keV can have significant neutrino energy loss via both plasma processes and nuclear weak interactions. We find that nuclear processes likely produce the highest-energy neutrinos. Among the important weak nuclear interactions are both charged current channels (electron capture/emission and positron capture/emission) and neutral current channels (de-excitation of nuclei via neutrino pair emission). We show that in order to make a realistic prediction of the nuclear neutrino spectrum, one must take nuclear structure into account; in some cases, the most important transitions may involve excited states, possibly in both parent and daughter nuclei. We find that the standard technique of producing a neutrino energy spectrum by using a single transition with a Q-value and matrix element chosen to fit published neutrino production rates and energy losses will not accurately capture important spectral features.

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