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 Nuclide | E | N | Atomic Mass [Nuclear Mass] {Mass Excess} | Spin I (h/2π) | Parent |
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 |
| Copernicium-277 | 277112Cn | 165 | 277.16354(17) u [277.1021096 u] {152.33653 MeV} | 3/2+ | |
| Copernicium-278 | 278112Cn | 166 | |||
| Copernicium-279 | 279112Cn | 167 | |||
| Copernicium-280 | 280112Cn | 168 | |||
| Copernicium-281 | 281112Cn | 169 | 281.16956(43) u [281.1081296 u] {157.94412 MeV} | 3/2+ | |
| Copernicium-282 | 282112Cn | 170 | 282.17051(59) u [282.1090796 u] {158.82904 MeV} | 0+ | |
| Copernicium-283 | 283112Cn | 171 | 283.17320(66) u [283.1117696 u] {161.33476 MeV} | ||
| Copernicium-283m | 283m112Cn | 171 | |||
| Copernicium-284 | 284112Cn | 172 | 284.17436(82) u [284.1129296 u] {162.41529 MeV} | 0+ | |
| Copernicium-285 | 285112Cn | 173 | 285.17723(54) u [285.1157996 u] {165.08868 MeV} | 5/2+ | |
| Copernicium-285m | 285m112Cn | 173 | |||
| Copernicium-286 | 286112Cn | 174 | 286.17869(75) u [286.1172596 u] {166.44866 MeV} | 0+ |
| Isotope | Radioactive Decay | Extern | |||
|---|---|---|---|---|---|
| Half-life | Decay Mode | Probability | Energy | ||
| 7 | 8 | 9 | 10 | 11 | 12 |
| Cn-277 | 0.00061 s | α → 273Ds SF div | > 83 % < 17 % | 11.622(58) MeV | AL |
| Cn-278 | AL | ||||
| Cn-279 | AL | ||||
| Cn-280 | AL | ||||
| Cn-281 | 0.18 s | α → 277Ds SF div | ≥ 87.5 % ≤ 12.5 % | 10.430(64) MeV | AL |
| Cn-282 | 0.00096 s | α 278Ds SF div | ≤ 7 % ≥ 93 % | 10.150(200) MeV | AL |
| Cn-283 | 4.6 s | α 279Ds SF div | 85 % 15 % | 9.888(113) MeV | AL |
| Cn-283m | AL | ||||
| Cn-284 | α 280Ds SF div | ≤ 3 % ≥ 97 % | 9.670(150) MeV | AL | |
| Cn-285 | 33 s | α → 281Ds SF div | 100 % ? | 9.388(116) MeV | AL |
| Cn-285m | AL | ||||
| Cn-286 | 11 min | α → 282Ds SF div | ca. 100 % ? | 9.235(761) MeV | |
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 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.
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 Copernicium 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]).
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.
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.
Last update: 2022-12-12
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