About   |   More   |   Search

Isotopes of Copernicium

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


Copernicium isotopes

Copernicium isotopes are exclusively artificially created atoms that have a very short half-life. The first isotope synthesized was 277 Cn in 1996. Six radioisotopes are known, from 277Cn to 285 Cn - and possibly two nuclear isomers (unconfirmed ).


Isotope Table: Copernicium


Atomic Properties

ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
277Cn112277165Copernicium-277277.16361(15) u
[277.1021796 u]
{152.40173 MeV}
281Cn112281169Copernicium-281281.16964(42) u
[281.1082096 u]
{158.01864 MeV}
282Cn112282170Copernicium-282282.17067(70) u
[282.1092396 u]
{158.97808 MeV}
283Cn112283171Copernicium-283283.17336(65) u
[283.1119296 u]
{161.4838 MeV}
284Cn112284172Copernicium-284284.17450(86) u
[284.1130696 u]
{162.5457 MeV}
285Cn112285173Copernicium-285285.17732(62) u
[285.1158896 u]
{165.17252 MeV}


Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
Cn-2770.00069 sα 273Ds11.620 MeVAL
Cn-2810.13 sα → 277Ds10.450 MeVAL
Cn-2820.00096 sα
SF div
100 %

Cn-2834.0 sα 279Ds
> 90 %
< 10 %
9.930 MeV
Cn-284α 280Ds
Sf div

Cn-28534 sα 281Ds9.320 MeVAL


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 Copernicium isotope.
6 - Relative atomic mass of the Copernicium 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 Copernicium 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 Copernicium 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.

Copernicium: 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

© 1996 - 2022 Internetchemistry

I agree!

This site uses cookies. By using this website, you agree to the use of cookies! Learn more ...