Neutrino Oscillation and Neutrino-Nucleus reaction

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K05354
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka University
• Principal Investigator: Sato Toru 大阪大学, 核物理研究センター, 招へい教授 (10135650)
• Research Collaborator: NAKAMURA Satoshi ; MURATA Tomoya ; IMAI Aiko
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: ニュートリノ振動 / 核子共鳴 / ニュートリノ原子核反応

Outline of Final Research Achievements

In neutrino-oscillation oscillation experiments with the long-base-line accelerator neutrino and atmospheric neutrino, neutrino properties are extracted through the neutrino-nucleus reaction in the high energy region. We have studied the neutrino induced pion production reactions in the nucleon resonance region. Parity violating the angular distribution of pion and the rescattering mechanisms of the neutrino-deuteron reaction have been investigated. Significant reduction of the spectra of spectator nucleon due to the final-state interaction was found for the neutrino-deuteron reaction. Our reaction model has been constructed by the comprehensive analysis of the world available data of pion, electron and photon induced meson production reaction, which has never been done before. Applications of our model for the neutrino-nucleus reaction have just started and the cross sections of the model are distributed to the analysis groups of neutrino data.

Free Research Field

原子核理論

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は、ニュートリノ混合角、質量階層性、時間反転不変性の破れの研究のため不可欠な精度の良い理論解析を進める基礎を与えたものである。我々の開発した核子共鳴領域のニュートリノ反応模型は、現在入手が可能なパイ中間子や電子、光子による反応データを包括的に解析した結果得られたもので、世界的にも例がない。この模型を原子核反応解析に組みいれる試みや、反応断面積等の情報を研究者コミュニティへ提供することも始められている。