Study of Solar Neutrinos at Super-Kamiokande

本论文将集中研究物质效应对超级神冈德太阳中微子的影响。这是对中微子的非常精确的测量，特别是处理非常低能的粒子，因此需要仔细的分析，以重建低能中微子并排除它们的背景。这篇论文将专注于提供最干净的太阳电子中微子样本的弹性散射过程。非零的昼夜不对称性意味着太阳中微子的味道振荡受到中微子飞行路径内物质存在的影响。本文的目的是考虑完全的Super-Kamiokande统计量，改进背景抑制，并首次观测到非零的昼夜不对称性。

This thesis will concentrate on the effect of matter effect on solar neutrino at Super-Kamiokande. It is a very precise measurement of the neutrinos, which in particular deals with very low energy particles, thus a careful analysis that can reconstruct low energy neutrinos and reject their background is needed. The thesis will focus on elastic scattering processes that provide the cleanest sample of solar electron neutrinos. A non-zero day/night asymmetry implies that the flavor oscillations of solar neutrinos are affected by the presence of matter within the neutrinos' flight path. The aim of this thesis is to take into account the full Super-Kamiokande statistics, improve the background rejection and provide the first observation of a non-zero day/night asymmetry.