An electrically neutral baryon having a mass 2,183 times that of the electron and a mean lifetime of approximately 2.6× 10-10 second. Also called lambda particle See table at subatomic particleλ超子:一种带电荷的中型重子,质量为电子的2,183倍,平均寿命为2.6× 10-10秒 也作 lambda particle 参见 subatomic particle