仲态电子偶素湮没辐射能量的测量  

Measurement of the Gamma Ray Energy in Parapositronium 2γ Decay

作　　者：张天保[1] 王海东[1] 沈智奇[1] 

机构地区：[1]中国科学院高能物理研究所,北京100080

出　　处：《高能物理与核物理》1991年第6期486-492,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金资助项目

摘　　要：利用充氧气的气凝硅胶电子偶素源,用与已知的^(106)Ruγ射线能量511856.2(2.3)eV相比较的方法,测得仲态电子偶素湮没2γ射线的能量为510998.7(2.5)eV,将此数值(经结合能修正)与电子静止质量所对应的能量(m_ec^2)进行了比较。Using a silica aerogel sample with oxygen gas introduced as the positronium source, the γ ray energy from the parapositronium 2γ annihilation has been measured as 510998.7 (2.5) eV by means of the comparison with the known γ energy 511856.2 (2.3) eV of the ^(106)Ru γ ray. The re- sult, after a revision of the binding energy of positronium, is comparied with the adjusted value of the electron rest mass published in several years ago.

关 键 词：仲态电子偶素 湮没 辐射 能量 测量 

分 类 号：O572.322[理学—粒子物理与原子核物理]