Neutrino spectrum from the pair-annihilation process in the hot stellar plasma
Neutrino spectrum from the pair-annihilation process in the hot stellar plasma
复制标题
热恒星等离子体中对湮灭过程的中微子光谱
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Kutschera
中科院分区：
文献类型：
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作者：
M. Misiaszek;Andrzej Odrzywołek;M. Kutschera
提出了一种计算高温恒星等离子体中电子-正电子湮灭过程中产生的中微子和反中微子能谱的新方法。探测到这些在前超新星（一种进化的高级中微子冷却恒星）中大量产生的中微子，可能在未来作为预坍缩预警系统的触发器。此外，对中微子的观测将探测前超新星中热核燃烧的最后阶段。用新方法得到的光谱与蒙特卡罗模拟结果进行了比较。为了在由中微子探测器阈值确定的感兴趣的能量范围内实现高精度，以前未知的显式形式的反中微子产生的微分截面被计算为等离子体静止框架中能量的函数。中微子谱是作为三维积分获得的，使用Cuhre算法计算，精度至少为5%。以费米-狄拉克积分的组合形式给出了中微子平均能量及其色散的公式。此外，还给出了整个光谱的有用的解析近似。
A new method of calculating the energy spectrum of neutrinos and antineutrinos produced in the electron-positron annihilation processes in hot stellar plasma is presented. Detection of these neutrinos, produced copiously in the presupernova, which is an evolutionary advanced neutrino-cooled star, may serve in the future as a trigger of a precollapse early warning system. Also, observation of neutrinos will probe final stages of thermonuclear burning in the presupernova. The spectra obtained with the new method are compared to Monte Carlo simulations. To achieve high accuracy in the energy range of interest, determined by neutrino detector thresholds, a differential cross section for production of the antineutrino, previously unknown in an explicit form, is calculated as a function of energy in the plasma rest frame. The neutrino spectrum is obtained as a 3-dimensional integral, computed with the use of the Cuhre algorithm of at least 5% accuracy. Formulas for the mean neutrino energy and its dispersion are given as a combination of Fermi-Dirac integrals. Also, useful analytical approximations of the whole spectrum are shown.