Collaborative Research: Determination of the Neutron Lifetime Using Magnetically Trapped Neutrons
合作研究:利用磁俘获中子测定中子寿命
基本信息
- 批准号:0354263
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2004
- 资助国家:美国
- 起止时间:2004-06-01 至 2009-11-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The decay of the free neutron is the simplest nuclear beta decay. The parameters that describe the decay of the free neutron, especially the neutron lifetime, provide essential inputs to all investigations that involve the weak interaction. A precise value for the neutron lifetime is required for several internal consistency tests of the Standard Model. The neutron lifetime is also an essential parameter in the theory of Big Bang Nucleosynthesis (BBN). At present, the uncertainty in the neutron lifetime currently provides the largest contribution to the uncertainty in the value of the helium to hydrogen ratio predicted by BBN theory. Intercomparison between the neutron lifetime, the observed cosmic light element abundances and the known number of light neutrino species provides a critical consistency check for BBN theory.This experiment will measure the neutron lifetime using magnetically trapped ultracold neutrons (UCN). A magnetic trap is "filled" by scattering a beam of low-energy neutrons from superfluid helium. Some neutrons lose enough energy to become trapped, with the remainder leaving the trapping region. The beam is then turned off and the rate of neutron decay, and thus their lifetime, is measured as these trapped neutrons undergo beta-decay. This technique should allow the researchers to substantial improve the precision that the neutron beta decay lifetime is known. Using the method of magnetic trapping, it should be possible to improve the accuracy of the neutron lifetime by a factor of between 2 and 50 using existing and next-generation neutron sources.
自由中子的衰变是最简单的核β衰变。 描述自由中子衰变的参数,特别是中子寿命,为所有涉及弱相互作用的研究提供了必要的输入。 中子寿命的精确值是标准模型的几个内部一致性检验所必需的。 中子寿命也是大爆炸核合成(BBN)理论中的一个重要参数。目前,中子寿命的不确定性对BBN理论预测的氦氢比值的不确定性贡献最大。 中子寿命、观测到的宇宙轻元素丰度和已知的轻中微子种类数量之间的相互比较为BBN理论提供了一个关键的一致性检查。 磁阱是通过从超流氦中散射出一束低能中子来“填充”的。 一些中子失去足够的能量被俘获,其余的离开俘获区。 然后关闭射束,当这些被俘获的中子经历β衰变时,测量中子衰变的速率,从而测量它们的寿命。 这项技术应该允许研究人员大幅提高中子β衰变寿命已知的精度。 使用磁捕获方法,应该可以使用现有和下一代中子源将中子寿命的准确性提高2至50倍。
项目成果
期刊论文数量(0)
专著数量(0)
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会议论文数量(0)
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Paul Huffman其他文献
Comparing Heavy-Tailed Distributions in Fitting the Canadian Stock Market Returns
比较拟合加拿大股市回报的重尾分布
- DOI:
10.2139/ssrn.3013860 - 发表时间:
2017 - 期刊:
- 影响因子:0
- 作者:
D. Eden;Paul Huffman;John Holman - 通讯作者:
John Holman
Paul Huffman的其他文献
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{{ truncateString('Paul Huffman', 18)}}的其他基金
Determination of the Neutron Lifetime using Magnetically Trapped Neutrons
使用磁俘获中子测定中子寿命
- 批准号:
0855593 - 财政年份:2009
- 资助金额:
-- - 项目类别:
Continuing Grant
A Superthermal Source at NCState University
北卡罗来纳州立大学的超热源
- 批准号:
0314114 - 财政年份:2004
- 资助金额:
-- - 项目类别:
Continuing Grant
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