Discovery of Beta Decay for Neutral Kaon

中性 Kaon 的 Beta 衰变的发现

• 批准号: 23654087
• 负责人: NANJO Hajime
• 金额: $ 2.41万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23654087/
• 关键词: KLベータ崩壊; thin gap chamber; ガス検出器; チェレンコフ検出器; ベータ崩壊; CP非保存

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.

研制了一种能够进行KLβ衰变搜索实验的探测器，它由12微米厚的镀铝聚脂薄膜阴极和1.6毫米厚的CF4和正戊烷混合气体组成的薄间隙室组成。尽管它的厚度为5 mg/cm~2，但可以在高通量中子和伽马束线上工作，带电粒子效率为99%。它在实际的高强度KL束线上进行了测试，运行稳定，命中率允许。

项目成果

Measurement of KL flux at the J-PARC neutral-kaon beam line

J-PARC 中性高介子光束线 KL 通量的测量

• DOI: 10.1016/j.nima.2011.11.010
• 发表时间: 2012
• 期刊: Nuclear Inst.and Methods in Physics Research, A
• 作者: Koji Shiomi;et.al.
• 通讯作者: et.al.

Study of the \(K_L^0 \to \pi^0\pi^0\nu\overline{\nu}\) decay

(K_L^0 o pi^0pi^0 uoverline{ u}) 衰减研究

• DOI: 10.1103/physrevd.84.052009
• 发表时间: 2011
• 期刊: Phys. Rev. D
• 作者: Koji Shiomi;et.al.;R. Ogata et al.
• 通讯作者: R. Ogata et al.