SGER: Determination of Atmospheric Neutron Attenuation Length at Geomagnetic Cutoff Rigidity of 17-18 Gigavolt (GV) in Southeast Asia

提出的研究旨在通过提高对宇宙射线强度随地磁截止刚度（地磁强度的一种度量）和海拔的空间变异性的认识，利用宇宙成因同位素的原位积累来改进地表暴露定年。建议对刚性大于17 GV、高度不超过6 km处的中子强度进行调查。这项工作将在东南亚（可能在泰国）进行，这是唯一一个刚度超过17 GV的地方。支持者将使用一架在固定高度飞行的小型飞机来测量中子强度。结果将用于确定该刚性的中子衰减长度（中子强度与高度的关系函数）。然后，该值将与他们的其他调查结果和其他已发表的数据一起使用，以确定衰减长度如何随截止刚度（或地磁纬度）变化。该项目的最终目标将是构建改进的配方，用于将宇宙成因同位素的生产速率从一个地点缩放到任何其他任意地点。

The proposed study aims to improve surface exposure dating using in-situ accumulation of cosmogenic isotopes by improving knowledge of the spatial variability of the cosmic-ray intensity with geomagnetic cutoff rigidity (a measure of geomagnetic intensity) and with elevation. The proposal is to conduct a survey of the neutron intensity at the rigidity greater than 17 GV and at altitudes up to 6 km. The work will be conducted in southeast Asia (probably in Thailand), the only location with rigidities above 17 GV. The proponents will measure the neutron intensity using a small aircraft flying at a constant altitude. The results will be used to determine the neutron attenuation length (the function that relates neutron intensity to elevation) for this rigidity. The value will then be used with their other survey results and with other published data to determine how the attenuation length varies with the cutoff rigidity (or with geomagnetic latitude). The final goal of the project will be the construction of improved formulations for scaling production rates of cosmogenic isotopes from one location to any other arbitrary location.