论文标题
中微子振荡，脱碳和中微子波包的长度的阻尼
Damping of neutrino oscillations, decoherence and the lengths of neutrino wave packets
论文作者
论文摘要
中微子质量特征状态的波数据包（WPS）的空间分离导致中微子振荡的破坏和阻尼。也可能是由中微子探测器的有限能量分辨率引起的，或者在带有放射性中微子源的实验的情况下，由发射中微子线的有限宽度引起。我们使用反应堆中微子实验和带有放射性$^{51} $ cr源的实验详细研究了这两种类型的阻尼效应。我们证明，通过WP分离的破坏效应始终可以纳入检测器的能量分辨率函数的修改，因此与之纠缠在一起。我们首次从放射性$^{51} $ cr源中估算了反应堆中微子的wps的长度$σ_x$。获得的值，$σ_x=（2 \ times 10^{ - 5} -1.4 \ times 10^{ - 4}）$ cm，至少比当前可用的实验下限大六个数量级。我们得出的结论是，在反应堆和放射性源实验中，无法探测通过WP分离的破坏性的影响。
Spatial separation of the wave packets (WPs) of neutrino mass eigenstates leads to decoherence and damping of neutrino oscillations. Damping can also be caused by finite energy resolution of neutrino detectors or, in the case of experiments with radioactive neutrino sources, by finite width of the emitted neutrino line. We study in detail these two types of damping effects using reactor neutrino experiments and experiments with radioactive $^{51}$Cr source as examples. We demonstrate that the effects of decoherence by WP separation can always be incorporated into a modification of the energy resolution function of the detector and so are intimately entangled with it. We estimate for the first time the lengths $σ_x$ of WPs of reactor neutrinos and neutrinos from a radioactive $^{51}$Cr source. The obtained values, $σ_x = (2\times 10^{-5} - 1.4\times 10^{-4})$ cm, are at least six orders of magnitude larger than the currently available experimental lower bounds. We conclude that effects of decoherence by WP separation cannot be probed in reactor and radioactive source experiments.
