

A368861


Even mass numbers with only one betastable isobar.


0



2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 38, 42, 44, 48, 52, 56, 60, 62, 66, 68, 72, 88, 90, 118, 140, 166, 172, 178, 182, 188, 194, 200, 202, 206, 208, 210, 222, 228, 234, 240, 246, 250
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OFFSET

1,1


COMMENTS

A betastable nuclide is a nuclide whose beta decay (betaminus and betaplus decay) is energetically disallowed; that is to say, a nuclide that has lower energy than its isobars with one more or one less proton. Note that double beta decay is allowed. A nuclide whose beta decay is energetially allowed, even if not observed (in the case of 48Ca, 96Zr, 123Te, 148Gd, 180mTa, 222Rn and 247Cm), is not classified as being betastable.
For even n <= 256 not being a term in this sequence, there are two betastable isobar with mass number n, except that there are three for n = 124, 130, 136, 150 and 154.
146 is not a term because even if 146Sm is unstable, it is betastable (in fact having lower energy than the stable 146Nd).
48 is a term because even if 48Ca is stable, it is not betastable.
Pages 1415 of the Hiroyuki Koura link predict only one further term 298 (corresponding to 298Fl) up to 332.


LINKS



EXAMPLE

The corresponding nuclides are 2H, 4He, 6Li, 8Be, 10B, 12C, 14N, 16O, 18O, 20Ne, 22Ne, 24Mg, 26Mg, 28Si, 30Si, 32S, 34S, 38Ar, 42Ca, 44Ca, 48Ti, 52Cr, 56Fe, 60Ni, 62Ni, 66Zn, 68Zn, 72Ge, 88Sr, 90Zr, 118Sn, 140Ce, 166Er, 172Yb, 178Hf, 182W, 188Os, 194Pt, 200Hg, 202Hg, 206Pb, 208Pb, 210Po, 222Ra, 228Th, 234U, 240Pu, 246Cm and 250Cf.


CROSSREFS



KEYWORD

nonn,fini,hard,more


AUTHOR



STATUS

approved



