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arXiv 1712.06985hep-phastro-ph.HE
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在未来大型液体闪烁探测器中实现超新星中微子谱的完全重建

Towards a complete reconstruction of supernova neutrino spectra in future large liquid-scintillator detectors

Hui-Ling Li, Yu-Feng Li, Meng Wang, Liang-Jian Wen, Shun Zhou

摘要:

在本文中,我们展示了如何进行一个相对更真实和完整的重建超新星中微子光谱在未来的大型液体闪烁体探测器,通过实施奇异值分解的方法与适当的正则化。对于银河系中距离$10~{\rm kpc}$的核塌缩超新星,由逆β衰变过程$\overlineν^{}_e + p \to e^+ + n$可以精确测定其$\overlineν^{}_e$谱,其分辨率与江门地下中微子观测站(JUNO)相当的$20~{\rm kiloton}$液体闪烁探测器可以记录5000多个事件。对于$ν^{}_e$和$ν^{}_x$,我们必须主要依靠弹性中微子-电子散射$ν+ e^- \to ν+ e^-$和弹性中微子-质子散射$ν+ p \to ν+ p$,其中$ν$表示所有三种口味的中微子和反中微子的集合,而$ν^{}_x$表示$ν^{}_μ$和$ν^{}_τ$以及它们的反粒子。为了证明我们的方法的有效性,我们还试图重建的中微子光谱,通过使用时间积分的中微子数据从最新的数值模拟延迟中微子驱动的超新星爆炸。

英文摘要:

In this paper, we show how to carry out a relatively more realistic and complete reconstruction of supernova neutrino spectra in the future large liquid-scintillator detectors, by implementing the method of singular value decomposition with a proper regularization. For a core-collapse supernova at a distance of $10~{\rm kpc}$ in the Milky Way, its $\overlineν^{}_e$ spectrum can be precisely determined from the inverse beta-decay process $\overlineν^{}_e + p \to e^+ + n$, for which a $20~{\rm kiloton}$ liquid-scintillator detector with the resolution similar to the Jiangmen Underground Neutrino Observatory (JUNO) may register more than 5000 events. We have to rely predominantly on the elastic neutrino-electron scattering $ν+ e^- \to ν+ e^-$ and the elastic neutrino-proton scattering $ν+ p \to ν+ p$ for the spectra of $ν^{}_e$ and $ν^{}_x$, where $ν$ denotes collectively neutrinos and antineutrinos of all three flavors and $ν^{}_x$ for $ν^{}_μ$ and $ν^{}_τ$ as well as their antiparticles. To demonstrate the validity of our approach, we also attempt to reconstruct the neutrino spectra by using the time-integrated neutrino data from the latest numerical simulations of delayed neutrino-driven supernova explosions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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