分析了子核具有三个激发态的典型核衰变情况下的级联校正情况，具体给出了测量滤材源的情况下具有代表性的符合校正因子计算的解析表达式。
The true coincidence correction for a specific three excited levels de-excitation case has been analyzed, and the typical analytical expressions of true coincidence correction factors have been given.
结果显示12B第二、三激发态为单中子晕核态，这是在B稳定线附近找到的第二个核新的晕核态。
The results show that the second and third excited states of 12B are one-neutron halo states. It is the second nucleus to be found with new halo states near the p stable line.
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