中微子昼夜不对称性的特殊季节效应
Peculiar seasonal effects in the neutrino day-night asymmetry
摘要：
我们分析了太阳中微子昼夜不对称性的特殊效应，由于它们在夜间和/或一年中的连续观测而发生。也就是说，我们表明，昼夜效应包含一个微不足道的，累积的贡献，从整个观察长期和一些本地化的条款起源于周围的午夜（在夜间）和两个至（在一年中）。我们估计后者的贡献，使用渐近的方法，并讨论其隔离的前景，即，放大，通过收缩中微子观测项到局部化点的小邻域。为了补充我们的渐近预测解析推导，我们还进行了充分的数值分析的昼夜效应的时间加权观测，包括昼夜不对称的能量谱和弹性散射检测通道的反冲能量分布的估计。根据分析和数值计算结果，事实证明，加权观测能够放大昼夜不对称性的特殊贡献的幅度，甚至可以放大到累积项的几倍，并且在下一代探测器上执行这样的加权程序以恢复地球中中微子再生效应的隐藏特征看起来是可行的和有吸引力的。
英文摘要：
We analyze peculiar effects in the day-night asymmetry of solar neutrinos taking place due to their continuous observation during the night and/or the year. Namely, we show that the day-night effect contains both a trivial, cumulative contribution from the whole observation term and a number of localized terms originating from around the midnights (during the nights) and the two solstices (during the year). We estimate the latter contributions using asymptotical methods and discuss the prospects of their isolation, i.e., magnification, by contraction of the neutrino observation term to small neighborhoods of the localization points. In order to complement our asymptotical predictions derived analytically, we also perform a full numerical analysis of a temporally-weighted observation of the day-night effect, including the energy spectrum of the day-night asymmetry and an estimation of the recoil energy distributions for the elastic-scattering detection channel. According to both analytical and numerical results, it turns out that a weighted observation is able to magnify the amplitude of the peculiar contribution to the day-night asymmetry even to as much as several times the cumulative term, and it looks feasible and appealing to perform such a weighting procedure at next-generation detectors to revive otherwise hidden signatures of the neutrino regeneration effect in the Earth.
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