Fundamental Studies in Nuclear Physics

核物理基础研究

基本信息

  • 批准号:
    1506459
  • 负责人:
  • 金额:
    $ 218.4万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2015
  • 资助国家:
    美国
  • 起止时间:
    2015-08-15 至 2018-07-31
  • 项目状态:
    已结题

项目摘要

Precise experimental tests of fundamental particle properties are now a well-established way to search for new laws of nature beyond our current physical knowledge. This research program centers around two experiments to make precise measurements of physical properties of the neutron. The first experiment, called UCNA, is being carried out at the Los Alamos National Laboratory, using extremely slow neutrons (ultra-cold neutrons, or UCN), which have such low energy that they can be stored in magnetic "bottles". This allows the experiment to make a precise measurement of the direction of the electron emitted when a neutron decays into a proton, an electron and a particle called an anti-neutrino. This provides needed information about the theory of radioactivity (also called the weak nuclear force). In addition, the PI and his group are developing equipment for a future experiment to search for a possible electric dipole moment (EDM) of the neutron. The existence of this EDM would be a signal of new physics beyond our current knowledge and could help to explain why the universe is dominated by matter, whereas the Standard Model of particle physics predicts there should be nearly equal amounts of matter and antimatter. Participation by postdoctoral scholars, graduate students, and undergraduates is an essential part of the research program, affording young researchers exceptional opportunities to advance their training and education in this frontier area of nuclear physics.This project is primarily focused on experimental research addressing fundamental properties of the free neutron. In particular the group will continue analyzing data from the UCNA experiment while also constructing hardware for a new, highly sensitive experiment to search for the neutron's EDM. The UCNA experiment will provide a high precision measurement of the beta-asymmetry in neutron decay using Ultra-Cold Neutrons for the first time. This quantity allows a sensitive test of the unitarity of the weak quark-mixing matrix and has the potential to provide evidence for new physics beyond the Standard Model of particle interactions. With recent improvements to the apparatus the group is poised to improve the precision on the asymmetry down to ~ 0.3% with additional data-taking and analysis during the period of this grant. The goal of the new EDM experiment, called nEDM, is being done at the Spallation Neutron Source at Oak Ridge National Laboratory and will improve the upper limit by a factor of 100 compared to previous measurements; observation of an EDM signals violation of time-reversal and charge-parity (CP) symmetry, and could provide important information related to the origin of the matter-antimatter asymmetry of the universe.
对基本粒子性质的精确实验测试现在是一种行之有效的方法,可以在我们现有的物理知识之外寻找新的自然定律。 该研究计划围绕两个实验进行,以精确测量中子的物理特性。 第一个实验名为UCNA,正在洛斯阿拉莫斯国家实验室进行,使用极慢中子(超冷中子,或UCN),其能量非常低,可以储存在磁性“瓶子”中。 这使得实验能够精确测量当中子衰变为质子,电子和称为反中微子的粒子时发射的电子方向。 这提供了关于放射性理论(也称为弱核力)的必要信息。 此外,PI和他的团队正在为未来的实验开发设备,以寻找中子可能的电偶极矩(EDM)。 这个EDM的存在将是一个超越我们现有知识的新物理学的信号,并有助于解释为什么宇宙由物质主导,而粒子物理学的标准模型预测应该有几乎等量的物质和反物质。博士后学者、研究生和本科生的参与是研究计划的重要组成部分,为年轻研究人员提供了在核物理这一前沿领域提高培训和教育的绝佳机会。该项目主要集中在解决自由中子基本性质的实验研究。特别是,该小组将继续分析来自UCNA实验的数据,同时还将为一个新的、高灵敏度的实验构建硬件,以寻找中子的EDM。UCNA实验将首次使用超冷中子对中子衰变中的β不对称性进行高精度测量。这个量允许对弱夸克混合矩阵的幺正性进行敏感的测试,并有可能为超越粒子相互作用标准模型的新物理学提供证据。随着最近对设备的改进,该小组准备在此期间通过额外的数据采集和分析将不对称性的精度提高到约0.3%。新的EDM实验的目标,称为nEDM,正在橡树岭国家实验室的Spectrometer中子源进行,与以前的测量相比,将上限提高100倍; EDM的观测信号违反了时间反演和电荷宇称(CP)对称性,并可以提供与宇宙物质-反物质不对称性起源有关的重要信息。

项目成果

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Bradley Filippone其他文献

Bradley Filippone的其他文献

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{{ truncateString('Bradley Filippone', 18)}}的其他基金

Fundamental Studies in Nuclear Physics
核物理基础研究
  • 批准号:
    2110898
  • 财政年份:
    2021
  • 资助金额:
    $ 218.4万
  • 项目类别:
    Continuing Grant
Collaborative Research: A Search for the Electric Dipole Moment of the Neutron
合作研究:寻找中子的电偶极矩
  • 批准号:
    1822515
  • 财政年份:
    2018
  • 资助金额:
    $ 218.4万
  • 项目类别:
    Continuing Grant
Fundamental Studies in Nuclear Physics
核物理基础研究
  • 批准号:
    1812340
  • 财政年份:
    2018
  • 资助金额:
    $ 218.4万
  • 项目类别:
    Continuing Grant
Collaborative Research: A Search for the Electric Dipole Moment of the Neutron
合作研究:寻找中子的电偶极矩
  • 批准号:
    1439980
  • 财政年份:
    2014
  • 资助金额:
    $ 218.4万
  • 项目类别:
    Continuing Grant
Fundamental Studies in Nuclear Physics
核物理基础研究
  • 批准号:
    1205977
  • 财政年份:
    2012
  • 资助金额:
    $ 218.4万
  • 项目类别:
    Continuing Grant
Fundamental Studies in Nuclear Physics
核物理基础研究
  • 批准号:
    0855538
  • 财政年份:
    2009
  • 资助金额:
    $ 218.4万
  • 项目类别:
    Standard Grant
Acquisition of a Spectrometer and Detectors for Precision Nuclear Physics Measurements of Neutron Beta Decay
购置光谱仪和探测器,用于中子 β 衰变的精密核物理测量
  • 批准号:
    0079767
  • 财政年份:
    2001
  • 资助金额:
    $ 218.4万
  • 项目类别:
    Continuing Grant

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RII Track-4:核反应从头开始建模,用于研究核合成和自然界的基本对称性
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