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Background for a gamma-ray satellite on a low-Earth orbit
Experimental Astronomy ( IF 3 ) Pub Date : 2019-03-08 , DOI: 10.1007/s10686-019-09624-0
P. Cumani , M. Hernanz , J. Kiener , V. Tatischeff , A. Zoglauer

The different background components in a low-Earth orbit have been modeled in the 10 keV to 100 GeV energy range. The model is based on data from previous instruments and it considers both primary and secondary particles, charged particles, neutrons and photons. The necessary corrections to consider the geomagnetic cutoff are applied to calculate the flux at different inclinations and altitudes for a mean solar activity. Activation simulations from such a background have been carried out using the model of a possible future gamma-ray mission (e-ASTROGAM). The event rates and spectra from these simulations were then compared to those from the isotopes created by the particles present in the South Atlantic Anomaly (SAA). The primary protons are found to be the main contributor of the activation, while the contributions of the neutrons, and that of the secondary protons can be considered negligible. The long-term activation from the passage through the SAA becomes the main source of background at high inclination (i≳10∘$\gtrsim 10^{\circ }$). The used models have been collected in a Python class openly available on github.

中文翻译:

低地球轨道上的伽马射线卫星的背景

在 10 keV 到 100 GeV 能量范围内模拟了低地球轨道中的不同背景分量。该模型基于先前仪器的数据,并考虑了初级和次级粒子、带电粒子、中子和光子。应用考虑地磁截止的必要修正来计算平均太阳活动在不同倾角和高度下的通量。已经使用未来可能的伽马射线任务(e-ASTROGAM)模型进行了来自这种背景的激活模拟。然后将来自这些模拟的事件发生率和光谱与来自南大西洋异常区 (SAA) 中存在的粒子产生的同位素的事件发生率和光谱进行比较。发现初级质子是激活的主要贡献者,而中子的贡献,次级质子的可忽略不计。通过 SAA 通道的长期激活成为高倾角背景的主要来源 (i≳10∘$\gtrsim 10^{\circ }$)。使用的模型已收集在 github 上公开可用的 Python 类中。
更新日期:2019-03-08
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