An elementary particle in the lepton family (not a meson), having a mass209 times that of the electron, a negative electric charge, and a meanlifetime of2.2? 0-6 second.
介子轻子族中的一种基本微粒(非介子),其质量为电子的209倍,是一种负电荷,平均寿命为2。
3
The relationship between positron meanlifetime and grain size, based on two state trapping model, has been developed, and the saturation trapping at grain boundaries has been predicated.