Seaborgium-263m

Properties and data of the isotope ²⁶³Sg.

Content

General data

Name of the isotope:Seaborgium-263m; Sg-263mSymbol:²⁶³Sg or 263106SgMass number A:263 (= number of nucleons)Atomic number Z:106 (= number of protons)Neutrons N:157Isotopic mass:263.11829(10) u (atomic weight of Seaborgium-263m)
Excitation energy: +y keVNuclide mass:263.0601498 u (calculated nuclear mass without electrons)Mass excess:110.18643 MeVMass defect:2.071555204 u (per nucleus)Nuclear binding energy:1929.64124319 MeV (per nucleus)
7.33703895 MeV (average binding energy per nucleon)Half-life:0.12 sDecay constant λ:5.7762265046662 s^-1Specific activity α:1.322633066539 × 10⁺²² Bq g^-1
357468396362.14 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+

Radioactive Decay

Half-life T_½ = 0.12 s respectively 1.2 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁵⁹Rf	?
Iso	²⁶³Sg	?

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
²⁶³Sg		1.0(2) s	9/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 157) and isobaric (same nucleon number A = 263) with Seaborgium-263m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 157	Isobar A = 263
97	²⁵⁴Bk
98	²⁵⁵Cf
99	²⁵⁶Es
100	²⁵⁷Fm
101	²⁵⁸Md
102	²⁵⁹No
103	²⁶⁰Lr	²⁶³Lr
104	²⁶¹Rf	²⁶³Rf
105	²⁶²Db	²⁶³Db
106	²⁶³Sg	²⁶³Sg
107	²⁶⁴Bh	²⁶³Bh
108	²⁶⁵Hs	²⁶³Hs
109	²⁶⁶Mt
110	²⁶⁷Ds