arXiv 2104.127842021-04hep-phhep-ex

加速器实验中的残余中微子

Relic neutrinos at accelerator experiments

Martin Bauer, Jack D. Shergold

备注：: 18 pages, 8 figures. Original title: Observing relic neutrinos with an accelerator experiment
发表信息：: Phys. Rev. D 104 (2021), 083039
DOI：: 10.1103/PhysRevD.104.083039

摘要：

提出了一种利用离子储存环观测宇宙中微子本底的新技术。利用高能量靶利用中微子捕获截面随束能量的二次增加，并且利用足够的束能量，使得能够从稳定的初始状态通过逆β衰变过程捕获中微子。我们还表明，存在离子系统承认共振中微子捕获，能够实现更大的捕获截面在较低的光束能量比他们的非共振同行。我们计算的中微子捕获率和最佳的实验运行时间为一系列不同的共振过程和目标离子，我们表明，共振捕获实验可以进行与低至每个目标核子$\mathcal{O}(10\,\mathrm{TeV})$的束能量。不幸的是，这里讨论的离子系统都不能提供足够的统计数据来发现宇宙中微子背景。考虑到光束和中微子动量分布、同步辐射以及光束稳定性的不确定性，我们解决了未来实现这一实验所面临的挑战。

英文摘要：

We present a new technique for observing low energy neutrinos with the aim of detecting the cosmic neutrino background using ion storage rings. Utilising high energy targets exploits the quadratic increase in the neutrino capture cross section with beam energy, and with sufficient beam energy, enables neutrino capture through inverse-beta decay processes from a stable initial state. We also show that there exist ion systems admitting resonant neutrino capture, capable of achieving larger capture cross sections at lower beam energies than their non-resonant counterparts. We calculate the neutrino capture rate and the optimal experimental runtime for a range of different resonant processes and target ions and we demonstrate that the resonant capture experiment can be performed with beam energies as low as $\mathcal{O}(10\,\mathrm{TeV})$ per target nucleon. Unfortunately, none of the ion systems discussed here can provide sufficient statistics to discover the cosmic neutrino background with current technology. We address the challenges associated with realising this experiment in the future, taking into account the uncertainty in the beam and neutrino momentum distributions, synchrotron radiation, as well as the beam stability.

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