Precision measurement of the decay rate of positronium negative ions

我们发展了测量正电子素负离子（一个正电子和两个电子的束缚态）衰变率的方法，比以前的测量精度更高。研究了高效、稳定地产生离子的方法。我们还建造了测量衰变率的装置。我们预计在2012年年底将得到衰变率的新结果。

We have developed the method to measure the decay rate of the positronium negative ion, a bound state of a positron and two electrons, with higher precision than the previous measurements. The procedure to produce the ions efficiently and stably has been studied. We have also constructed the apparatus to measure the decay rate. We expect that we will obtain the new result of the decay rate by the end of 2012.