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Isotopes of Bohrium

List, data and properties of all known isotopes of Bohrium.


Bohrium isotopes

All of the atomic nuclei of the chemical element Bohrium are summarized under Bohrium isotopes; these consist of an atomic nucleus with 107 protons and in the uncharged state of 107 electrons. The difference between the individual bohrium isotopes lies in the number of neutrons in the nucleus - and thus in the mass number.

Like all artificially produced elements, bohrium does not have stable atomic nuclei - all of them annihilate with a half-life of around one minute (270Bh) or far less.


Isotope Table: Bohrium

The two following tables list the most important data and properties of the Bohrium isotopes. Further information on the individual Bohrium isotopes is listed on separate pages and can be accessed via the link in column 1.


Atomic Properties

ENAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
Bohrium-260260107Bh153260.12166(26) u
[260.0629714 u]
{113.32556 MeV}
Bohrium-261261107Bh154261.12145(22) u
[261.0627614 u]
{113.12995 MeV}
Bohrium-262262107Bh155262.12296(33) u
[262.0642714 u]
{114.5365 MeV}
Bohrium-262m262m107Bh155262.12296(33) u
[262.0642714 u]
{114.5365 MeV}
Bohrium-264264107Bh157264.12459(19) u
[264.0659014 u]
{116.05484 MeV}
Bohrium-265265107Bh158265.12498(25) u
[265.0662914 u]
{116.41812 MeV}
Bohrium-266266107Bh159266.12679(17) u
[266.0681014 u]
{118.10412 MeV}
Bohrium-267267107Bh160267.12750(28) u
[267.0688114 u]
{118.76548 MeV}
Bohrium-270270107Bh163270.13337(32) u
[270.0746814 u]
{124.23335 MeV}
Bohrium-271271107Bh164271.13518(45) u
[271.0764914 u]
{125.91936 MeV}
Bohrium-272272107Bh165272.13826(57) u
[272.0795714 u]
{128.78836 MeV}
Bohrium-274274107Bh167274.14351(66) u
[274.0848214 u]
{133.6787 MeV}
Bohrium-278278107Bh171278.15499(43) u
[278.0963014 u]
{144.37226 MeV}


Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
Bh-26035 msα → 256Db
SF div
EC → 260Sg
18 %
18 %
10.40(5) MeV

6.78(25) MeV
Bh-26112 msα → 257Db
SF div.
95 %
5 %
10.50(5) MeV
Bh-262102(26) msα → 258Db≤ 100 %10.319(15) MeVAL
Bh-262m8.0(21) msα → 258Db≤ 100 %AL
Bh-263- unknown -AL
Bh-2640.44 sα → 260Db≤ 100 %9.96(15) MeVAL
Bh-2651.19(52) sα → 261Db?AL
Bh-2662.1 sα → 262Db
SF div

9.43(8) MeV
Bh-26714 sα → 263Db
SF div
ca. 100 %
9.230(202) MeV
Bh-268- unknown -AL
Bh-269- unknown -AL
Bh-27060 sα → 266Db
SF div
ca. 100 %
9.064(95) MeV
Bh-2711.5 sα → 267Db?9.42(5) MeVAL
Bh-27210.5 sα → 268Dbca. 100 %9.30(5) MeVAL
Bh-273- unknown -AL
Bh-27444 sα → 270Db
SF div

8.95(5) MeV
Bh-275- unknown -
Bh-276- unknown -
Bh-277- unknown -
Bh-27819 minα → 274Db
SF div


Notes (related to the columns):

1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Bohrium 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.
5 - nuclear spin I, unit: h/2π.
6 - 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.

7 - isotope notation in short form.
8 - decay: half-live of the Bohrium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: 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.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).


()- 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 Bohrium 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.

Bohrium: 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.


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Last update: 2022-12-12

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