On-ground detection of an electron-positron annihilation line from thunderclouds
On-ground detection of an electron-positron annihilation line from thunderclouds
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雷云中电子-正电子湮没线的地面探测
DOI：
10.1103/physreve.93.021201
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
K. Makishima
中科院分区：
文献类型：
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作者：
D Umemoto;H. Tsuchiya;T. Enoto;S. Yamada;T. Yuasa;M. Kawaharada;T. Kitaguchi;K. Nakazawa M. Kokubun;H. Kato;M. Okano;T. Tamagawa;K. Makishima
雷云可以产生轫致辐射伽马射线发射，有时甚至产生正电子。 2012 年 1 月 13 日 00:27:00（世界标准时间），位于日本面向日本海的 GROWTH 实验检测到来自雷雨云的强烈伽马射线爆发。该事件始于持续时间为数毫秒的尖锐伽马射线闪光，与云内放电一致，随后是持续数秒的衰减较长伽马射线发射。这种长时间发射的光谱达到MeV，并包含一条明显的线发射atkeV，可以用电子-正电子湮灭线来识别。在仪器能量分辨率范围内，该线很窄，并且包含的光子数量达到了检测到的总信号光子的 0.1-10 MeV。结果，线等效宽度达到keV，这意味着一个不平凡的结果。结果表明，向下的正电子束产生了连续光子和线光子。
Thunderclouds can produce bremsstrahlung gamma-ray emission, and sometimes even positrons. At 00:27:00 (UT) on 13 January 2012, an intense burst of gamma rays from a thundercloud was detected by the GROWTH experiment, located in Japan, facing the Sea of Japan. The event started with a sharp gamma-ray flash with a duration ofms coincident with an intracloud discharge, followed by a decaying longer gamma-ray emission lasting fors. The spectrum of this prolonged emission reachedMeV, and contained a distinct line emission atkeV, to be identified with an electron-positron annihilation line. The line was narrow within the instrumental energy resolution, and containedphotons which amounted toof the total signal photons ofdetected over 0.1–10 MeV. As a result, the line equivalent width reachedkeV, which implies a nontrivial result. The result suggests that a downward positron beam produced both the continuum and the line photons.