Study for the molecular bremsstrahlung from extensive air showers

这是对高能宇宙射线引发的大范围空气簇射产生的分子韧致辐射的基础研究。这项技术有望提供一种新的宇宙线探测方法，具有良好的角分辨率和能量分辨率，并具有100%的运行时间效率。我们在美国大阪和犹他州开发了两套射电望远镜。在大阪，我们巧合地操作了两台带有空气簇射阵列的Ku波段射电望远镜，探测到的无线电信号与空气簇射不谋而合。但观测到的事件率比理论预期的要小。在犹他州，我们安装了两个望远镜，它们与电子直线加速器同时运行。我们没有探测到任何来自加速电子束的无线电信号。

This is a basic research for the molecular bremsstrahlung from extensive air showers induced by high energy cosmic rays. This technique can be expected to provide a new detection method for cosmic rays with a good angular and energy resolutions and also with 100% of running time efficiency. We developed two sets of radio telescopes in Osaka and in Utah, USA. In Osaka, we were coincidentally operating two Ku band radio telescopes with an air shower array, and detected radio signals coincidently with air showers. But the observed event rate is smaller than a theoretical expectation. In Utah, we installed two telescopes that operated coincidentally with an electron linear accelerator. We did not detect any radio signals from accelerated electron beams.