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Isotopes of Bohrium

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


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


Atomic Properties

ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
260Bh107260153Bohrium-260260.12166(26) u
[260.0629714 u]
{113.32556 MeV}
261Bh107261154Bohrium-261261.12145(22) u
[261.0627614 u]
{113.12995 MeV}
262Bh107262155Bohrium-262262.12296(33) u
[262.0642714 u]
{114.5365 MeV}
262mBh107262155Bohrium-262m262.12296(33) u
[262.0642714 u]
{114.5365 MeV}
264Bh107264157Bohrium-264264.12459(19) u
[264.0659014 u]
{116.05484 MeV}
265Bh107265158Bohrium-265265.12498(25) u
[265.0662914 u]
{116.41812 MeV}
266Bh107266159Bohrium-266266.12679(17) u
[266.0681014 u]
{118.10412 MeV}
267Bh107267160Bohrium-267267.12750(28) u
[267.0688114 u]
{118.76548 MeV}
270Bh107270163Bohrium-270270.13336(31) u
[270.0746714 u]
{124.22404 MeV}
271Bh107271164Bohrium-271271.13518(45) u
[271.0764914 u]
{125.91936 MeV}
272Bh107272165Bohrium-272272.13826(57) u
[272.0795714 u]
{128.78836 MeV}
274Bh107274167Bohrium-274274.14351(66) u
[274.0848214 u]
{133.6787 MeV}


Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
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) MeV+x keVAL
Bh-262m8.0(21) msα → 258Db≤ 100 %+y keVAL
Bh-263- unbekannt -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-26717 sα → 263Db9.23(20) MeVAL
Bh-268- unbekannt -AL
Bh-269- unbekannt -AL
Bh-27060 sα → 266Db
SF div

9.06(5) MeV
Bh-2711.5 sα → 267Db?9.42(5) MeVAL
Bh-27210.5 sα → 268Dbca. 100 %9.30(5) MeVAL
Bh-273- unbekannt -AL
Bh-27444 sα → 270Db
SF div

8.95(5) MeV


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 Bohrium isotope.
6 - 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.
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 Bohrium 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]).


()- 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.


Category: Isotopes

Last update: 05.07.2020

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