Anita-iv观察到的异常近骑士宇宙射线样事件

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Anita-iv观察到的异常近骑士宇宙射线样事件

Unusual Near-horizon Cosmic-ray-like Events Observed by ANITA-IV

论文作者

ANITA Collaboration, Gorham, P. W., Ludwig, A., Deaconu, C., Cao, P., Allison, P., Banerjee, O., Batten, L., Bhattacharya, D., Beatty, J. J., Belov, K., Binns, W. R., Bugaev, V., Chen, C. H., Chen, P., Chen, Y., Clem, J. M., Cremonesi, L., Dailey, B., Dowkontt, P. F., Fox, B. D., Gordon, J. W. H., Hast, C., Hill, B., Hsu, S. Y., Huang, J. J., Hughes, K., Hupe, R., Israel, M. H., Liu, T. C., Macchiarulo, L., Matsuno, S., McBride, K., Miki, C., Nam, J., Naudet, C. J., Nichol, R. J., Novikov, A., Oberla, E., Olmedo, M., Prechelt, R., Prohira, S., Rauch, B. F., Roberts, J. M., Romero-Wolf, A., Rotter, B., Russell, J. W., Saltzberg, D., Seckel, D., Schoorlemmer, H., Shiao, J., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Sutherland, M. S., Varner, G. S., Vieregg, A. G., Wang, S. H., Wissel, S. A.

论文摘要

Anita于2016年底的第四次长期气球飞行检测到29台宇宙射线（CR）类似的事件，背景为$ 0.37^{+0.27} _ { - 0.17} $人类事件。 CRS主要在反射中看到南极冰盖，从而产生了特征性的相位波形极性。但是，四个类似于水的CR般的事件显示出异常的非向极性，如果由于背景，$ p = 5.3 \ times 10^{ - 4} $机会。所有异常事件均来自地平线附近的位置。 Anita-IV观察到没有类似于以前的飞行中发生的两个此类事件的陡峭异常事件。

ANITA's fourth long-duration balloon flight in late 2016 detected 29 cosmic-ray (CR)-like events on a background of $0.37^{+0.27}_{-0.17}$ anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a characteristic phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous non-inverted polarity, a $p = 5.3 \times 10^{-4}$ chance if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply-upcoming anomalous events similar to the two such events seen in prior flights.

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