原子核滴线

在以原子核内中子数为横坐标，以质子数为纵坐标的核素图上,在丰质子一侧和丰中子一侧,各有一条边界线，超过边界线的原子核将只能以质子/中子发射为其衰变方式，称为原子核滴线，丰质子一侧的滴线称为质子滴线，丰中子一侧的滴线称为中子滴线。

已知的值

目前，只有前10种元素的中子滴线的值是已知的，即H~Ne。^[1] 若Z = 8，中子数的最大值是16因而O-24是最重的氧同位素。^[2]

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^ Nuclear Physicists Examine Oxygen's Limits. Sciencedaily.com. 2007-09-18 [2010-04-06]. （原始内容存档于2019-05-10）.
^ Mukha, I.; et al. Deep excursion beyond the proton dripline. I. Argon and chlorine isotope chains. Physical Review C. 2018, 98 (6): 064308–1–064308–13. arXiv:1803.10951  . doi:10.1103/PhysRevC.98.064308.
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^ Zhang, Z. Y.; Gan, Z. G.; Yang, H. B.; et al. New isotope ²²⁰Np: Probing the robustness of the N = 126 shell closure in neptunium. Physical Review Letters. 2019, 122 (19): 192503. doi:10.1103/PhysRevLett.122.192503.