Measurement of the neutron lifetime using magnetically trapped neutrons: tSPECT

使用磁俘获中子测量中子寿命：tSPECT

• 批准号: 319989837
• 负责人: Professor Dr. Werner Heil
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/319989837?language=en
• 关键词: Measurement; neutron; lifetime; using; magnetically

The lifetime of the free neutron is a basic physical quantity, which is relevant in a variety of different fields of particle and astrophysics. In this project a precise measurement of the neutron lifetime using three-dimensional magnetic storage of ultra-cold neutrons (UCN) will be conducted. The differences in the results of experiments using different methods, beam and material bottle experiments, indicate that there are still some subtle and not understood effects in some of these experiments. Rather than relying on neutron reflection from a material wall, where neutron up-scattering and capture cause significant wall losses, magnetically trapped neutrons do not interact with matter during storage. That is the obvious appeal to the use of magnetic and gravitational confinement, where, at least in principle, the dynamics of the neutron-trap interaction is well understood and under control. The experiment tSPECT is located at the pulsed UCN-source of the TRIGA Mainz research reactor. It will become fully operational end of 2016. In the requested 3 years funding period beam times will be conducted to study and to minimize the systematic effects. A measurement of a competitive neutron lifetime with ~ 1 s accuracy is planned towards the end of the funding period (during the last third). We aim to continue tSPECT in an upgraded version in the framework of PRISMA II, the planned continuation of the excellence cluster PRISMA. An overall accuracy of delta tn = 0.2-0.3 s is envisaged.

自由中子的寿命是基本的物理量，在各种不同的粒子和天体物理学领域都相关。在该项目中，将对超冷中子（UCN）的三维磁性存储对中子寿命进行精确测量。使用不同方法，梁和材料瓶实验的实验结果差异表明，在其中一些实验中，仍然存在一些微妙的效果。与其依赖于从物质壁中的中子反射，中子散落和捕获会导致明显的壁损失，而是在存储期间与物质不相互作用。这显然吸引了使用磁性和引力限制的吸引力，至少从原则上讲，中子陷阱相互作用的动力学是充分理解和控制的。该实验位于Triga Mainz研究反应器的脉冲UCN源。它将成为2016年的全面运营。在要求的3年资金期限期间，将进行研究并最大程度地减少系统效应。计划在资金期结束时（在最后三分之一）计划对具有〜1 S精度的竞争性中子寿命的测量。我们的目标是在Prisma II的框架中继续升级的版本，即卓越集群Prisma的计划延续。设想了达美T = 0.2-0.3 s的总体精度。