Discovery of Beta Decay for Neutral Kaon

研制了一种能进行KL β衰变探测实验的探测器，其阴极为12 μ m厚的镀铝聚酯薄膜，气体为1.6 mm厚的CF 4和正戊烷混合气体。尽管它的厚度为5 mg/cm ~ 2，但它可以在高通量中子和γ束线上运行，带电粒子效率为99%。在实际的高强度KL光束线上进行了测试，结果表明，该系统工作稳定，命中率在允许范围内。

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.