arXiv 1901.113422019-01-31nucl-exnucl-th

未来双β衰变实验研究中微子质量的倒序区和正常序区的可能性

Possibilities of future double beta decay experiments to investigate inverted and normal ordering region of neutrino mass

A. S. Barabash

备注：: 11 pages, 1 figures, 3 tables
发表信息：: Frontiers in Physics, 2019, Volume 6, Article 160

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摘要：

综述了寻找无中微子双衰变的现代实验。考虑到核矩阵元值和轴矢量常数$g_A$值的不确定性，讨论了Majorana中微子$\langle m_ν \rangle$有效质量的极限.根据振荡实验结果和现代宇宙学数据对$\langle m_ν \rangle$的值作了预测。讨论了在$\sim$ 10-50 meV水平上对$\langle m_ν \rangle$具有灵敏度的下一代实验（主要研究倒序（IO）区域）的可能性。%描述了最发达和最有前途的项目。最后对NO区的研究前景进行了展望。结果表明，研究NO的可能性取决于最轻中微子m $_0$的质量。在小质量（m $_0$ $\le$ 0.1 meV）的极限情况下，预测了$\langle m_ν \rangle$ $\approx$ 1-4 meV的值，这使得下一代实验无法对该区域进行研究。但是在NO的框架中存在允许的m $_0$（7-30 meV）区域，其中$\langle m_ν \rangle$的预测值可以是$\sim$ 10-30 meV，这对于下一代实验是完全可以实现的。本文还讨论了在$\sim$ 1-10 meV水平上提高$\langle m_ν \rangle$灵敏度的可能性。

英文摘要：

An overview of modern experiments on the search for neutrinoless double decay is presented. The obtained limits on the effective mass of the Majorana neutrino $\langle m_ν \rangle$ are discussed taking into account the uncertainties in the value of the nuclear matrix elements (NMEs) and the value of the axial-vector constant $g_A$. Predictions for the values of $\langle m_ν \rangle$ from the results of oscillation experiments and modern cosmological data are presented. The possibilities of the next generation experiments with sensitivity to $\langle m_ν \rangle$ at the level of $\sim$ 10-50 meV (studying mainly the inverted ordering (IO) region) are discussed. %Description of the most developed and promising projects is presented. The prospects for studying the normal ordering (NO) region are discussed too. It is shown that the possibilities of studying the NO depend on the mass of the lightest neutrino m$_0$. In the limiting case of small mass (m$_0$ $\le$ 0.1 meV), the values of $\langle m_ν \rangle$ $\approx$ 1-4 meV are predicted, which makes the study of this region inaccessible by the next generation experiments. But there is an allowed region of m$_0$ (7-30 meV) in the framework of NO, where the predicted values for $\langle m_ν \rangle$ could be $\sim$ 10-30 meV and that is quite achievable for the next generation experiments. The possibility to rich in the future sensitivity to $\langle m_ν \rangle$ at the level of $\sim$ 1-10 meV is also discussed.

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