仲态电子偶素湮没辐射能量的改进测量

Improved Measurement ofγ-Energy from Parapositronium 2γ-Decay

用充氧气的气凝硅胶作仲态电子偶素源，用１９２Ｉｒ精密ｙ能量作标准，以时间选择能谱仪和滑动比较法改进测量仲态电子偶素２ｙ湮没能量，得到ｈｖ＝５１０９９５．３４±０．６９ｅＶ．经电子偶素结合能修正，得正、负电子对静止质量，与电子质量比较，表明正、负电子质量在１．４ｐｐｍ内一致．

Using a silica aerogel sample with oxygen gas filled as the positronium(Ps)source and a time selecting energy spectrometer,the measurement of the y-energy of parapositronium(p-Ps)2y-decay is further improved and the result of hv=510995. 34±0.69eV is obtained by a slithering comparison with the precisely known y-energies of 192Ir.The rest mass of a pair of positron and electron is determined by the correction with the binding energy of Ps,which shows a mass equality within 1.4ppm between positron and electron by the comparison with the rest mass of electron.