Not until he went through real hardship ______ the love we have for our families is important.

A．did he realize

B．had he realized

C．he realized

D．he had realized

在匀强磁场中的A点有一个静止的原子核发生衰变生成电荷量较大的新核和电荷两量较小的某种粒子，且衰变后形成如图所示的两个外切圆，求：

(1)该核发生的是何种衰变？

(2)图中轨迹1，2分别是什么粒子形成的？