原子核滴線

在以原子核內中子數為橫坐標，以質子數為縱坐標的核素圖上,在豐質子一側和豐中子一側,各有一條邊界線，超過邊界線的原子核將只能以質子/中子發射為其衰變方式，稱為原子核滴線，豐質子一側的滴線稱為質子滴線，豐中子一側的滴線稱為中子滴線。

已知的值

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

^ Three First-ever Atomic Nuclei Created; New Super-heavy Aluminum Isotopes May Exist. Sciencedaily.com. 2007-10-27 [2010-04-06]. （原始內容存檔於2019-05-09）.
^ Nuclear Physicists Examine Oxygen's Limits. Sciencedaily.com. 2007-09-18 [2010-04-06]. （原始內容存檔於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.
^ Meierfrankenfeld, D.; Bury, A.; Thoennessen, M. Discovery of scandium, titanium, mercury, and einsteinium isotopes. Atomic Data and Nuclear Data Tables. 2011, 97 (2): 134–151. arXiv:1003.5128  . doi:10.1016/j.adt.2010.11.001.
^ Gross, J.L.; Claes, J.; Kathawa, J.; Thoennessen, M. Discovery of zinc, selenium, bromine, and neodymium isotopes. Atomic Data and Nuclear Data Tables. 2012, 98 (2): 75–94. arXiv:1012.2027  . doi:10.1016/j.adt.2011.12.001.
^ 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.