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Neutrino Physics Related with Underground Experiments

与地下实验相关的中微子物理

基本信息

批准号：
05640355
负责人：
MINAKATA Hisakazu
金额：
$ 1.02万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640355/
关键词：
neutrino mass flavor mixing neutrino oscillation equivalence principle solar neutrinos supernova neutrinos AGN neutrinos long-baseline neutrino experiments

项目摘要

The pricipal objective of this three-year research project is to perform detailed investigations on the following three thema : (1) How to test the Einstein equivalence principle using neutrinos. (2) Physics of neutrinos from galactic supernova. (3) Some theoretical idea for making Superkamiokande to neutral-current detector.During the process of performing the study, however, it was recognized that we have to take the anomalies implied by the solar and the atmospheric neutrino observations at their face value. There is also an impressive success of the cold and hot dark matter model of the structure formation in the universe. Then, there appeared the fourth thema, (4) Structure of lepton mixing theough studying the three-flavor analysis of neutrino oscillations, which we divorted our pricipal effort in the last year of our project. Brief summary of the outcome and the present status of these thema are as follows :(1) We have made substantial progress in this topics. We have proposed t … More hat by using long baseline neutrino oscillation experiments the test of the equivalence principle can be done to the accuracy of 10^<-14>. We also examined in detail the sensitivity of testing the equivalence principle which is attainable by using solar neutrinos, and obtained 1-2 orders of magnitude better result. Finally we discussed the possibility of drastically improving the sensitivity by using neutrinos from AGN.The improvement is dramatic, some 21 decimal and 12 decimal places for massless and massive neutrinos, respectively.(2) We are in the way of developing code by which we can do better computation of the cross sections on oxigen target in water.(3) We examined MgCl and LiCl as soluble materials which can produce detectable signals, but the question of background level remains to be unresolved.(4) Complehensive analyzes are performed utilizing the above three hints for neutrino masses which come from astrophysical and cosmological observations and under the constraints from accelerator and reactor data. They illuminate that the pattern of lepton mixing is essentially determined up to the degeneracy which can then be resoled by imposing the neutrinoless double beta decay constraint. Less

这个为期三年的研究项目的主要目标是对以下三个主题进行详细的研究：(1)如何利用中微子测试爱因斯坦等效原理。(2)银河系超新星中微子物理学。(3)制作超神冈中性电流探测器的一些理论构想。然而，在进行研究的过程中，人们认识到我们必须从表面上看待太阳和大气中微子观测所暗示的异常。宇宙结构形成的冷暗物质和热暗物质模型也取得了令人印象深刻的成功。然后，出现了第四个主题，(4)轻子混合的结构，通过研究中微子振荡的三味分析，这是我们在项目最后一年的主要工作。现将本专题的成果和现状简要总结如下：(1)本专题取得了实质性进展。此外，利用长基线中微子振荡实验，等效原理的检验精度可达10^<-14>。我们还详细考察了利用太阳中微子测试等效原理的灵敏度，得到了1-2个数量级的好结果。最后讨论了利用AGN的微中子大幅提高灵敏度的可能性。改进是显著的，无质量中微子和大质量中微子的小数点后21位和小数点后12位分别得到了改进。(2)我们正在开发能够更好地计算水中氧靶截面的代码。(3)我们研究了MgCl和LiCl作为可溶物质，可以产生可检测的信号，但背景水平的问题仍然没有解决。(4)利用天体物理和宇宙学观测得到的上述三个线索，在加速器和反应堆数据的约束下，对中微子质量进行了综合分析。他们阐明了轻子混合的模式基本上是由简并决定的，简并可以通过施加中微子双衰变约束来解决。少