Prospects for high energy light isotope measurements on balloons
Prospects for high energy light isotope measurements on balloons
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气球上高能轻同位素测量的前景
DOI：
10.22323/1.236.0682
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
G. Tarlé
中科院分区：
文献类型：
--
作者：
S. Wakely;S. Coutu;D. Müller;J. Musser;S. Nutter;N. Park;M. Schubnell;G. Tarlé
最近在宇宙射线通量中检测到的一些“反常现象”突显了提高我们对宇宙射线来源和传播过程的理解的重要性。为此，关键的观测任务之一是在现有信息极其稀缺的相对论能量(∼1GeV/n以上)下测量轻宇宙线同位素的相对丰度。特别是，迫切需要测量时钟同位素10Be在一定范围内的相对论时间膨胀。然而，这样的测量带来了严峻的实验挑战。只有当具有强磁场的磁光谱仪配备最先进的高分辨率跟踪器，并结合环形成像切伦科夫计数器等设备进行精确速度测量时，才能达到所需的质量分辨率。此外，需要较大的曝光系数才能获得良好的统计准确性。在这篇演讲中，我们将简要回顾这种测量的目标和挑战，并描述一种新的拟议仪器--HELIX(高能光同位素实验)，该仪器旨在应对长时间气球飞行中的这些挑战。
A number of recent ‘anomalies’ detected in the cosmic-ray flux have underscored the importance of improving our understanding of cosmic-ray source and propagation processes. To this end, one of the key observational tasks is obtaining measurements of the relative abundances of the light cosmic-ray isotopes at relativistic energies (above ∼1 GeV/n), where existing information is extremely scarce. In particular, measurements of the clock isotope 10Be for a range of relativistic time dilations are urgently needed. However, such measurements present a severe experimental challenge. The required mass resolution can only be reached if magnetic spectrometers with strong magnetic fields are equipped with state-of-the-art high-resolution trackers, and combined with devices such as ring-imaging Cherenkov counters for precise velocity measurements. Additionally, large exposure factors are needed for good statistical accuracy. In this presentation, we will briefly review the goals and challenges of such measurements, and describe a new proposed instrument, HELIX (the High-Energy Light Isotope eXperiment), that is designed to meet these challenges on a long-duration balloon flight.