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arXiv 1708.02248hep-phastro-ph.SR
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keV能太阳中微子通量

Solar neutrino flux at keV energies

Edoardo Vitagliano, Javier Redondo, Georg Raffelt

摘要:

我们计算了keV能量范围内的太阳中微子和反中微子通量。主要的热源过程是光生($γe\to e ν\barν$),韧致辐射($e+Ze\to Ze+e+ν\barν$),等离子体衰变($γ\toν\barν$),和$ν\barν$发射在自由束缚和束缚束缚过渡的部分电离元素比氢和氦。后者的过程中占主导地位的能量范围内的几个千电子伏,从而携带有关太阳金属丰度的信息。为了计算它们的速率,我们使用单色光子辐射不透明度库,类似于之前对太阳轴子发射的计算。我们的整体通量谱和许多细节与以前的作品有很大不同。虽然这种低能量通量无法用现代技术测量,但它可能成为未来直接搜索keV质量无菌中微子暗物质的重要背景。

英文摘要:

We calculate the solar neutrino and antineutrino flux in the keV energy range. The dominant thermal source processes are photoproduction ($γe\to e ν\barν$), bremsstrahlung ($e+Ze\to Ze+e+ν\barν$), plasmon decay ($γ\toν\barν$), and $ν\barν$ emission in free-bound and bound-bound transitions of partially ionized elements heavier than hydrogen and helium. These latter processes dominate in the energy range of a few keV and thus carry information about the solar metallicity. To calculate their rate we use libraries of monochromatic photon radiative opacities in analogy to a previous calculation of solar axion emission. Our overall flux spectrum and many details differ significantly from previous works. While this low-energy flux is not measurable with present-day technology, it could become a significant background for future direct searches for keV-mass sterile neutrino dark matter.

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