Precision Electron Capture Branching Ratio Measurements for Double Beta Decay with TITAN

使用 TITAN 进行双 Beta 衰变的精密电子捕获分支比测量

基本信息

批准号：
418523-2012
负责人：
Andreoiu, Corina
金额：
$ 11.66万
依托单位：
Simon Fraser University
依托单位国家：
加拿大
项目类别：
Subatomic Physics Envelope - Project
财政年份：
2012
资助国家：
加拿大
起止时间：
2012-01-01 至 2013-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=515748
关键词：
Precision Electron Capture Branching Ratio

项目摘要

Mysterious subatomic particles known as neutrinos are still not fully understood. A recent and controversial experiment at the world's largest nuclear physics laboratory CERN (located near Geneve) has reported that neutrinos may travel faster than the speed of light, exceeding nature's cosmic speed limit. The character of massive neutrinos is one of the most puzzling questions in physics. The possibility of observing a special kind of decay, called neutrinoless double-beta decay (0nußß), offers scientists the chance to gain insight into the mysterious nature of neutrinos. Although this decay process has yet to be observed, many low-counting rates experiments are being conducted worldwide in underground laboratories to address this problem. If the 0nußß decay is observed, detailed knowledge of the underlying nuclear structure will be required to determine the mass of the neutrino from the half-life of the 0nußß decay. The nuclear transition is described by a special term called the nuclear matrix elements (NME), that is calculated theoretically. These calculations can be tested using the 2nußß decay mode. Not only can the NME be extracted from the 2nußß decay, but part of the NME can be inferred from the electron capture (EC) decay branches of the several nuclei in ßß decays.

被称为中微子的神秘亚原子粒子最近在世界最大的核物理实验室欧洲核子研究组织（位于日内瓦附近）进行的一项颇具争议的实验报告称，中微子的传播速度可能超过光速，超过了自然界的宇宙速度极限。大质量中微子的特征是物理学中最令人费解的问题之一，即观察到一种特殊的衰变的可能性，这种衰变称为无中微子双β衰变。 (0nußß) 为科学家提供了深入了解中微子神秘性质的机会，尽管这种衰变过程尚未被观察到，但世界各地正在地下实验室进行许多低计数率实验来解决这个问题。据观察，需要详细了解底层核结构，才能根据 0nußß 衰变的半衰期确定中微子的质量。核跃迁由一个称为“中微子”的特殊术语来描述。核基质元素 (NME)，即理论上计算的。这些计算可以使用 2nußß 衰变模式进行测试。不仅可以从 2nußß 衰变中提取 NME，而且可以从电子捕获 (EC) 中推断出部分 NME。 ßß 衰变中的几个原子核的衰变分支。