A137306 Related to A018226 and A018227: due to the stable element 118 (last term in A018227) this is submitted as a suggested new observed list with 459 as a probable next new atomic weight stable island.

2, 8, 20, 28, 50, 83, 118, 126, 168, 194, 298

Offset: 1

Author

Roger L. Bagula, Apr 20 2008

Keywords

• nonn
• obsc
• uned

Comments

"These are crucial to the notion of an 'island of stability', which Glenn Seaborg espoused."

References

• Y. Oganessian, J. Phys. G: Nucl. Part. Phys, 2007, iop.org
• Rosenfeld, L. (1948). Nuclear Forces. Interscience Publishers, New York, xvii.
• G. T. Seaborg - Contemporary Physics, 2004, informaworld.com

Crossrefs

Cf. A018226, A018227.

Programs

Mathematica

(* nuclear radius visualization from Rosenfeld*) Clear[r, A, r0, p, n, m] A[p_, n_] := If[p == 0, 1, p + n] r0 = 1.3214405*10^(-13); r[p_, n_] := r0*( 1 + 0.8*(n/A[p, n])^2 - 0.3/A[p, n]^(1/3) + 0.010*p^2/A[p, n]^(4/3)) a0 = Table[Table[r[p, n], {n, p, Floor[2*p]}], {p, 0, 120}]; ListPlot[Flatten[a0]]

Formula

Roughly a(n) = Floor[1.53*a(n-1)]

Extensions

Definition not clear to me. - N. J. A. Sloane, Apr 25 2008