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arXiv 2104.03451astro-ph.EPastro-ph.IM
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月球探测中子探测器(LEND)观测用于研究月球挥发物的校准和确认

Calibration and validation of the lunar exploration neutron detector (LEND) observations for the study of the moon volatiles

J. J. Su, T. P. McClanahan, A. M. Parsons, R. Sagdeev, W. V. Boynton, G. Chin, T. A. Livengood, R. D. Starr, D. Hamara

摘要:

本文综述了月球勘测轨道器月球探测中子探测器的改进标定方法。我们交叉校准了一套LEND观测和模型的探测器的物理几何形状和组成对麦金尼阿波罗17时代测量的中子通量,月球勘探者中子谱仪超热中子观测,地球为基础的银河宇宙线观测和高度依赖模型的月球中子发射通量。我们的LEND系统的Geant 4软件包的中子输运建模,使我们能够充分分解的不同贡献的月球,航天器和仪器依赖的中子和带电粒子源在LEND任务。通过这种改进的校准,我们现在可以完全预测八个氦3探测器的每一次观测,以及整个LEND现在在月球上进行的十多年观测活动的中子和带电粒子的预期总计数率和部分计数率。这项研究改进了所有探测器的校准。LEND准直和非准直传感器的高空间分辨率说明使用与南极Cabeus永久阴影区相关的中子抑制区。

英文摘要:

This paper reviews improved calibration methods for the Lunar Reconnaissance Orbiter Lunar Exploration Neutron Detector. We cross calibrated the set of LEND observations and models of its detectors physical geometry and composition against the McKinney Apollo 17 era measured neutron flux, Lunar Prospector Neutron Spectrometer epithermal neutron observations, Earth based Galactic Cosmic Ray observations and altitude dependent models of the Moon neutron emission flux. Our neutron transport modeling of the LEND system with the Geant4 software package allows us to fully decompose the varying contributions of lunar, spacecraft and instrument dependent sources of neutrons and charged particles during the LEND mission. With this improved calibration, we can now fully predict every observation from the eight helium 3 detectors and the expected total and partial count rates of neutrons and charged particles for the entirety of LEND now ten plus year observation campaign at the Moon. The study has resulted in an improved calibration for all detectors. The high spatial resolution of LEND collimated and uncollimated sensors are illustrated using the neutron suppression region associated with the south polar Cabeus permanent shadowed region.

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