This work extends the idea of using a cyclotron-based antineutrino source for purposes of neutrino physics.Long baseline experiments suffer from degeneracies and correlations between Θ_(23), δ_(CP) and the mass hier...This work extends the idea of using a cyclotron-based antineutrino source for purposes of neutrino physics.Long baseline experiments suffer from degeneracies and correlations between Θ_(23), δ_(CP) and the mass hierarchy.However, the combination of a superconducting cyclotron and a big liquid scintillator detector like JUNO in a medium baseline experiment, which does not depend on the mass hierarchy, may allow to determine whether the position of the mixing angle Θ_(23) is in the lower octant or the upper octant. Such an experiment would improve the precision of the Θ_(23) measurement to a degree which depends on the CP-phase.展开更多
The preference of the normal neutrino mass ordering from the recent cosmological constraint and the global fit of neutrino oscillation experiments does not seem like a wise choice at first glance since it obscures the...The preference of the normal neutrino mass ordering from the recent cosmological constraint and the global fit of neutrino oscillation experiments does not seem like a wise choice at first glance since it obscures the neutrinoless double beta decay and hence the Majorana nature of neutrinos.Contrary to this naive expectation,we point out that the actual situation is the opposite.The normal neutrino mass ordering opens the possibility of excluding the higher solar octant and simultaneously measuring the two Majorana CP phases in future 0ν2βexperiments.Especially,the funnel region will completely disappear if the solar mixing angle takes the higher octant.The combined precision measurement by the JUNO and Daya Bay experiments can significantly reduce the uncertainty in excluding the higher octant.With a typical O(meV)sensitivity on the effective mass|mee|,the neutrinoless double beta decay experiment can tell if the funnel region really exists and hence exclude the higher solar octant.With the sensitivity further improved to sub-meV,the two Majorana CP phases can be simultaneously determined.Thus,the normal neutrino mass ordering clearly shows phenomenological advantages over the inverted one.展开更多
基金Supported by the China Postdoctoral Science Foundation(2018M643283)the National Key R&D program of China(2018YFA0404103)the National Natural Science Foundation of China(NSFC)(11775315)
文摘This work extends the idea of using a cyclotron-based antineutrino source for purposes of neutrino physics.Long baseline experiments suffer from degeneracies and correlations between Θ_(23), δ_(CP) and the mass hierarchy.However, the combination of a superconducting cyclotron and a big liquid scintillator detector like JUNO in a medium baseline experiment, which does not depend on the mass hierarchy, may allow to determine whether the position of the mixing angle Θ_(23) is in the lower octant or the upper octant. Such an experiment would improve the precision of the Θ_(23) measurement to a degree which depends on the CP-phase.
文摘为了解决高速数字接收机中混频数据处理能力有限的问题,设计了基于八分圆周矢量旋转(OCVR)的高速数字正交混频器.该混频器仅通过简单二进制补码运算器和移位加法器即可实现,且不需要进行迭代运算.分析比较了常规的基于ROM架构、基于直接坐标旋转数字计算机(CORDIC)架构以及基于OCVR架构的混频器,结果显示基于OCVR的混频器拥有更高的数据吞吐量、更低的硬件资源消耗以及混频噪声小等特点.根据OCVR特性设计了武汉电离层斜向返回探测系统(WIOBSS)的中频(IF)数字接收机,该系统可以获取实时的宽带扫频后向散射电离图.实验证明该系统的探测覆盖范围已经延伸至3 000 km.
基金supported by JSPS KAKENHI(JP18K13536)the Double First Class start-up fund(WF220442604)provided by Shanghai Jiao Tong Universitysupported by the National Natural Science Foundation of China(11275101,11835005)。
文摘The preference of the normal neutrino mass ordering from the recent cosmological constraint and the global fit of neutrino oscillation experiments does not seem like a wise choice at first glance since it obscures the neutrinoless double beta decay and hence the Majorana nature of neutrinos.Contrary to this naive expectation,we point out that the actual situation is the opposite.The normal neutrino mass ordering opens the possibility of excluding the higher solar octant and simultaneously measuring the two Majorana CP phases in future 0ν2βexperiments.Especially,the funnel region will completely disappear if the solar mixing angle takes the higher octant.The combined precision measurement by the JUNO and Daya Bay experiments can significantly reduce the uncertainty in excluding the higher octant.With a typical O(meV)sensitivity on the effective mass|mee|,the neutrinoless double beta decay experiment can tell if the funnel region really exists and hence exclude the higher solar octant.With the sensitivity further improved to sub-meV,the two Majorana CP phases can be simultaneously determined.Thus,the normal neutrino mass ordering clearly shows phenomenological advantages over the inverted one.
