When no hydrogen is left in the core , p - p chain reaction stops . remember that solar mass stars burn hydrogen through p - p chain producing helium , while stars more massive than 1 . 1 solar masses undergo the cno cycle 当核心氢气燃烧殆尽之后，质子质子链便会停止还记得约相等于一个太阳质量的恒星是用质子质子链把氢原子核转化为氦原子核吗？
The new rate of 11c ( p , ) 12n is larger by about a factor of 2 than that of ref . [ tan02 ] , and could transfer 3he to cno materials earlier , so that it may act as a seed of the cno cycle and cause the explosive of the massive star 计算结果表明，在某些巨质量贫金属星中， “ he通过“ c ( p ，的‘ zn从p一p链过度到cno循环，有可能起到种子核的作用，引发星体的爆炸，从而改变巨质量星塌缩为黑洞的命运。
