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Observations of High Energy Cosmic-Ray Electrons from 30 GeV to 3 TeV with Emulsion Chambers

机译：30 GeV至3 TeV高能宇宙线电子的观测   与乳液室

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We have performed a series of cosmic-ray electron observations using theballoon-borne emulsion chambers since 1968. While we previously reported theresults from subsets of the exposures, the final results of the total exposuresup to 2001 are presented here. Our successive experiments have yielded thetotal exposure of 8.19 m^2 sr day at the altitudes of 4.0 - 9.4 g/cm^2. Theperformance of the emulsion chambers was examined by accelerator beam tests andMonte-Carlo simulations, and the on-board calibrations were carried out byusing the flight data. In this work we present the cosmic-ray electron spectrumin the energy range from 30 GeV to 3 TeV at the top of the atmosphere, which iswell represented by a power-law function with an index of -3.28+-0.10. Theobserved data can be also interpreted in terms of diffusive propagation models.The evidence of cosmic-ray electrons up to 3 TeV suggests the existence ofcosmic-ray electron sources at distances within ~1 kpc and times within ~1x10^5yr ago.
机译：自1968年以来，我们已经使用气球载乳剂室进行了一系列宇宙射线电子观测。虽然我们先前曾报道过部分暴露的结果，但此处显示了2001年之前的总暴露量的最终结果。我们连续的实验在4.0-9.4 g / cm ^ 2的高度下总暴露量为8.19 m ^ 2 sr·day。乳化室的性能通过加速器束测试和蒙特卡洛模拟进行了检验，并使用飞行数据进行了机载校准。在这项工作中，我们介绍了在大气层顶部从30 GeV到3 TeV的能量范围内的宇宙射线电子光谱，该光谱很好地由幂律函数表示，折射率为-3.28 + -0.10。所观察到的数据也可以用扩散传播模型来解释。高达3 TeV的宇宙射线电子的证据表明，在距离〜1 kpc内和距离〜1x10 ^ 5yr内存在宇宙射线电子源。

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