Neutrino pair emission from excited atoms
Neutrino pair emission from excited atoms
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DOI：
10.1103/physrevd.75.113007
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发表时间：
2006-11
影响因子：
5
通讯作者：
M. Yoshimura
中科院分区：
文献类型：
--
作者：
M. Yoshimura
我们探索了一种可能性，测量的绝对大小和性质（马约拉纳与狄拉克）的中微子质量，通过使用一种新的过程中的中微子对发射从亚稳态激发原子。除了轻子数不守恒过程外，中微子对（$\ensuremath{\nu}\overline{\ensuremath{\nu}}$）辐射是唯一利用全同费米子的干涉效应直接区分Majorana中微子和Dirac中微子的过程。原子能级之间的能量差很小，这使得测量中微子振荡实验所表明的小中微子质量变得更容易。关键是如何在不增加辐射衰变的情况下提高对发射率。我们讨论了两种特殊情况：（1）亚稳原子的激光辐射对辐射，（2）环形里德伯态的微波辐射辐射。指出了微波辐照里德伯原子时，参数放大增强中微子对辐射的新机制，而腔QED效应可能抑制辐射过程。各种各样的可测量的中微子参数和各种各样的实验方法，使这项调查有吸引力。
We explore a possibility of measuring the absolute magnitude and the nature (Majorana vs Dirac) of neutrino masses, by using a novel process of neutrino pair emission from metastable excited atoms. Except lepton number nonconserving processes, the neutrino pair ($\ensuremath{\nu}\overline{\ensuremath{\nu}}$) emission is the unique process to directly distinguish the Majorana neutrino from the Dirac neutrino, using the interference effect of identical fermions. The small energy difference between atomic levels makes it easier to measure small neutrino masses as indicated by neutrino oscillation experiments. The crucial point is how to enhance the rate of pair emission without enhancing the radiative decay. We discuss two particular cases; (1) laser irradiated pair emission from metastable atoms, and (2) microwave irradiated emission from circular Rydberg states. A new mechanism of the parametric amplification to enhance the neutrino pair emission is pointed out when Rydberg atoms are irradiated by microwave, while the radiative process may be inhibited by the cavity QED effect. A great variety of measurable neutrino parameters and a variety of experimental methods make this investigation attractive.