Discovery of Beta Decay for Neutral Kaon

研制了一种能够进行KL衰变搜索实验的探测器。阴极为12um厚的镀铝聚酯薄膜，气体体积为1.6 mm厚的CF4和正戊烷气体混合物。尽管其厚度为5mg/cm2，但它可以在高通量中子和伽马束流线中以99%的带电粒子效率工作。在实际的高强度KL束流线上进行了测试，结果表明该系统运行稳定，具有一定的允许命中率。

A detector which enables the KL beta decay search experiment has been developed.A thin gap chamber is constructed with cathodes of 12-um thick aluminized mylar filmand a 1.6-mm-thick gas volume of CF4 and n-pentane gas mixture. In spite of its thickness of 5mg/cm2, it can be operated in high-flux neutron and gamma beam line with 99% charged particle efficiency. It was tested in the actual high intensity KL beam line and was proved to be operated stably in it with an allowable hit rate.