Talk:Neutron number

Is there such a thing as Neutron number? I have never heard of such a phrase and apart from a reference to this article neither has google. The only external reference is dead (404). Atomic mass and Atomic number = proton number are well defined but are there any external references to "Neutron number"?

"The case of 84 is special"
I would say that 86 is equally special, as shown by the isodiaphers 142Ce-146Nd, 144Nd-148Sm and 146Sm-150Gd. The only difference is that 150Gd is not stable to double beta decay, but it is still stable to quadruple beta decay (in contrast to 150Nd). — Preceding unsigned comment added by 2A04:CEC0:108E:A0A3:2803:9251:F360:D117 (talk) 19:45, 12 February 2024 (UTC)

Magic number effect is terribly significant
Beta-stable isotones with 84 ≤ N ≤ 86 (150Gd, 146Sm, 147Sm, 144Nd, 148Sm, 145Nd, 142Ce, 146Nd) have short (alpha) half-lives among nuclides with 83 ≤ N ≤ 126.

Beta-stable isotones with 127 ≤ N ≤ 132 (214Rn, 212Po, 213Po, 218Ra, 216Rn, 215At, 214Po, 217Rn, 220Ra, 219Fr, 218Rn, 216Po, 211Po) all have (alpha) half-lives under a second.

Beta-stable isotones with 133 ≤ N ≤ 134 (224Th, 221Ra, 222Ra, 220Rn) have (alpha) half-lives ranging from a second to a minute.

Beta-stable isotones with 135 ≤ N ≤ 137 (226Th, 224Ra, 225Ac, 223Ra, 227Th) have (alpha) half-lives ranging from half an hour to several days.

Beta-stable isotones with 138 ≤ N ≤ 153 (252Fm, 230U, 242Cm, 248Cf, 228Th, 236Pu, 250Cf, 244Cm, 232U, 238Pu, ...) have (alpha) half-lives ranging from a day to billions of years.

Beta-stable isotones with 154 ≤ N ≤ 158 (254Fm, 255Fm, 256Fm, 259Md, 253Es, 257Fm, 252Cf, 254Cf; only SF known for 258No, 256Cf, 258Fm and 260No) have alpha half-lives ranging from several hours to several years. 129.104.241.214 (talk) 08:37, 28 January 2024 (UTC)