Isotopes of seaborgium
List of isotopes
Abbreviations: EC: Electron capture IC: Internal conversion SF: Spontaneous fission Not directly synthesized, occurs in the decay chain of ²⁷⁰Ds Not directly synthesized, occurs in the decay chain of ²⁷¹Ds Not directly synthesized, occurs as decay product of ²⁷⁰Hs Not directly synthesized, occurs as decay product of ²⁷¹Hs Not directly synthesized, occurs in the decay chain of ²⁸⁵Fl Not directly synthesized, occurs in the decay chain of ²⁸⁷Fl

Isotopes of seaborgium

Section Title: List of isotopes
Table Section Text: Abbreviations: EC: Electron capture IC: Internal conversion SF: Spontaneous fission Not directly synthesized, occurs in the decay chain of ²⁷⁰Ds Not directly synthesized, occurs in the decay chain of ²⁷¹Ds Not directly synthesized, occurs as decay product of ²⁷⁰Hs Not directly synthesized, occurs as decay product of ²⁷¹Hs Not directly synthesized, occurs in the decay chain of ²⁸⁵Fl Not directly synthesized, occurs in the decay chain of ²⁸⁷Fl

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin and parity

excitation energy

258Sg	106	152	258.11298(44)#	3.3(10) ms [2.9(+13−7) ms]	SF	(various)	0+

259Sg	106	153	259.11440(13)#	580(210) ms [0.48(+28−13) s]	α	255Rf	1/2+#

260Sg	106	154	260.114384(22)	3.8(8) ms	SF (74%)	(various)	0+

α (26%)	256Rf

261Sg	106	155	261.115949(20)	230(60) ms	α (98.1%)	257Rf	7/2+#

EC (1.3%)	261Db

SF (.6%)	(various)

261mSg	92 µs	IC	261Sg

262Sg	106	156	262.11634(4)	8(3) ms [6.9(+38−18) ms]	SF (92%)	(various)	0+

α (8%)	258Rf

263Sg	106	157	263.11829(10)#	1.0(2) s	α	259Rf	9/2+#

263mSg	100(70)# keV	120 ms	α (87%)	259Rf	3/2+#

SF (13%)	(various)

264Sg	106	158	264.11893(30)#	37 ms	SF	(various)	0+

265aSg	106	159	265.12109(13)#	8(3) s	α	261Rf

265bSg	16.2 s	α	261Rf

266Sg	106	160	266.12198(26)#	360 ms	SF	(various)	0+

267Sg	106	161	267.12436(30)#	1.4 min	SF (83%)	(various)

α (17%)	263Rf

269Sg	106	163	269.12863(39)#	14 min	α	265Rf

271Sg	106	165	271.13393(63)#	2.4 min	α (67%)	267Rf	3/2+#

SF (33%)	(various)

Sentence(s)

⁶¹ᵐSg, decays by internal conversion.

final_sentence: ⁶¹ᵐSg, decays by internal conversion.