论文标题
使用大气中微子的振荡定位核心壳边界
Locating the Core-Mantle Boundary using Oscillations of Atmospheric Neutrinos
论文作者
论文摘要
大气中微子提供了一个独特的途径，可以根据弱相互作用探索地球的内部结构，这与地震研究和重力测量相辅相成。在这项工作中，我们证明了在地球物质存在下的大气中微子振荡可以作为定位核心壳边界（CMB）的重要工具。像拟议的50 kt磁化ICAL一样，大气中微子检测器可以有效地观察到核心中微子。这些中微子会经历MSW共振以及参数或中微子振荡长度共振。这些共振对中微子风味转化的净效应取决于CMB的位置和密度在该半径上的跳跃。我们量化了在多个三层地球模型的背景下测量CMB位置的能力。对于核心的密度和半径保持柔性的模型，而固定地球的质量和半径以及外壳的密度也是固定的，可以确定CMB的位置，其位置约为250 km，约为250 km，暴露于1000 kt $ \ cdot $ yr。使用81层PREM配置文件，此$1σ$精度约为350公里。 ICAL的电荷识别能力在实现这一精度方面起着重要作用。
Atmospheric neutrinos provide a unique avenue to explore the internal structure of Earth based on weak interactions, which is complementary to seismic studies and gravitational measurements. In this work, we demonstrate that the atmospheric neutrino oscillations in the presence of Earth matter can serve as an important tool to locate the core-mantle boundary (CMB). An atmospheric neutrino detector like the proposed 50 kt magnetized ICAL at INO can observe the core-passing neutrinos efficiently. These neutrinos would have experienced the MSW resonance and the parametric or neutrino oscillation length resonance. The net effect of these resonances on neutrino flavor conversions depends upon the location of CMB and the density jump at that radius. We quantify the capability of ICAL to measure the location of CMB in the context of multiple three-layered models of Earth. For the model where the density and the radius of core are kept flexible while the mass and radius of Earth as well as the densities of outer and inner mantle are fixed, ICAL can determine the location of CMB with a 1$σ$ precision of about 250 km with an exposure of 1000 kt$\cdot$yr. With the 81-layered PREM profile, this $1σ$ precision would be about 350 km. The charge identification capability of ICAL plays an important role in achieving this precision.
