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Isotopes of Seaborgium

List, data and properties of all known isotopes of Seaborgium as well as radioactive decay products and intermediate products.

 

Seaborgium isotopes

All of the atomic nuclei of the chemical element seaborgium are summarized under seaborgium isotopes; these consist of an atomic nucleus with 106 protons and in the uncharged state of 106 electrons. The difference between the individual seaborgium isotopes lies in the number of neutrons in the nucleus - and thus in the mass number.

 

General

As in the other synthetic elements, there are no stable isotopes of seaborgium either, i. H. the nuclides decay quickly and are highly radioactive.

The undoubted first isotope of Sg produced was 263mSg in 1974.

There are now 12 radioisotopes in total between 258Sg and 271Sg as well as 2 core isomers (261mSg and 263mSg) are known. These were either generated by bombarding two lighter atomic nuclei or were temporarily observed as intermediate products during the decay of heavier atomic nuclei.

The longest-lived seaborgium isotope is 269Sg with a half-life of 3.1 minutes; it occurs in the decay chain of one of the flerovium isotopes - 285Fl.

 

Isotope Table: Seaborgium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
258Sg106258152Seaborgium-258258.11298(44) u
[258.0548398 u]
{105.24019 MeV}
0+
259Sg106259153Seaborgium-259259.11435(12) u
[259.0562098 u]
{106.51634 MeV}
1/2+
260Sg106260154Seaborgium-260260.114384(22) u
[260.0562438 u]
{106.54801 MeV}
0+
261Sg106261155Seaborgium-261261.115948(20) u
[261.0578078 u]
{108.00487 MeV}
7/2+
261mSg106261155Seaborgium-261m261.115948(20) u
[261.0578078 u]
{108.00487 MeV}
262Sg106262156Seaborgium-262262.11634(4) u
[262.0581998 u]
{108.37001 MeV}
0+
263Sg106263157Seaborgium-263263.11829(10) u
[263.0601498 u]
{110.18643 MeV}
9/2+
263mSg106263157Seaborgium-263m263.11829(10) u
[263.0601498 u]
{110.18643 MeV}
3/2+
264Sg106264158Seaborgium-264264.11893(30) u
[264.0607898 u]
{110.78258 MeV}
0+
265Sg106265159Seaborgium-265265.12109(13) u
[265.0629498 u]
{112.79461 MeV}
266Sg106266160Seaborgium-266266.12197(26) u
[266.0638298 u]
{113.61432 MeV}
0+
267Sg106267161Seaborgium-267267.12436(30) u
[267.0662198 u]
{115.84059 MeV}
268Sg106268162Seaborgium-268
269Sg106269163Seaborgium-269269.12857(39) u
[269.0704298 u]
{119.76218 MeV}
270Sg106270164Seaborgium-270
271Sg106271165Seaborgium-271271.13393(63) u
[271.0757898 u]
{124.75499 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Sg-2582.5 (+9-7) msSF div
α 254Rf
90 %
≤ 20 %

9.62(30) MeV
AL
Sg-2590.29(5) sα → 255Rf
SF div
EC → 259Db
90(10) %

9.765(8) MeV

4.53(13) MeV
AL
Sg-2603.6(9) msα → 256Rf
SF div
50 %
50 %
9.901(10) MeV
AL
Sg-2610.23(6) sα → 257Rf
SF div

9.714(15)) MeV
AL
Sg-261m92 msAL
Sg-2626.9 msSF div
α → 258Rf
≥ 78 %
≤ 12 %

9.60(15) MeV
AL
Sg-2631.0(2) sα → 259Rf
SF div
> 70 %
< 30 %
9.40(6) MeV
AL
Sg-263m0.12 sα → 259Rf
Iso → 263Sg
?
?

+y keVAL
Sg-26437(+27-11) msSF div
α → 260Rf

< 36 %

9.21(20) MeV
AL
Sg-26514.4(+37-25) sα 261Rf
SF div
≥ 50 %
≤ 50 %
9.05(11) MeV
AL
Sg-2660.34 sα 262Rf
SF div
18 %
8.80(10) MeV
AL
Sg-267- unbekannt -AL
Sg-268- unbekannt -AL
Sg-2693.1(+37-11) minα → 265Rfca. 100 %8.65(5) MeVAL
Sg-270- unbekannt -AL
Sg-2712.4(+43-10) minα → 267Rf
SF div
50 %
50 %
8.89(11) MeV
AL

 

Notes (related to the columns):

1 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Seaborgium isotope.
6 - Relative atomic mass of the Seaborgium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - Source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.
10 - Decay: Half-live of the Seaborgium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - Other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

Literature Sources and References

Properties of the Seaborgium nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Seaborgium: NMR properties

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

 


Category: Isotopes

Last update: 05.07.2020



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