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Isotope Nuclide | E | N | Atomic Mass [Nuclear Mass] {Mass Excess} | Spin I(h/2π) | Parent |
---|---|---|---|---|---|

1 | 2 | 3 | 4 | 5 | 6 |

Meitnerium-266 | 266109Mt | 157 | 266.13737(33) u [266.0775847 u] {127.95933 MeV} | ||

Meitnerium-267 | 267109Mt | 158 | |||

Meitnerium-268 | 268109Mt | 159 | 268.13865(25) u [268.0788647 u] {129.15164 MeV} | (5+,6+) | |

Meitnerium-268m | 268m109Mt | 159 | 268.13865(25) u [268.0788647 u] {129.15164 MeV} | ||

Meitnerium-269 | 269109Mt | 160 | |||

Meitnerium-270 | 270109Mt | 161 | 270.14032(21) u [270.0805347 u] {130.70724 MeV} | ||

Meitnerium-270m | 270m109Mt | 161 | 270.14033(18) u [270.0805447 u] {130.71655 MeV} | ||

Meitnerium-271 | 271109Mt | 162 | |||

Meitnerium-272 | 272109Mt | 163 | |||

Meitnerium-273 | 273109Mt | 164 | |||

Meitnerium-274 | 274109Mt | 165 | 274.14734(40) u [274.0875547 u] {137.24633 MeV} | ^{278}Rg | |

Meitnerium-275 | 275109Mt | 166 | 275.14897(42) u [275.0891847 u] {138.76466 MeV} | ||

Meitnerium-276 | 276109Mt | 167 | 276.15171(57) u [276.0919247 u] {141.31695 MeV} | ||

Meitnerium-277 | 277109Mt | 168 | 277.153530(710) u [277.0937447 u] {143.01227 MeV} | ||

Meitnerium-278 | 278109Mt | 169 | 278.156490(620) u [278.0967047 u] {145.7695 MeV} | ||

Meitnerium-282 | 282109Mt | 173 |

Isotope | Radioactive Decay | Extern | |||
---|---|---|---|---|---|

Half-life | Decay Mode | Probability | Energy | ||

7 | 8 | 9 | 10 | 11 | 12 |

Mt-266 | 2.1(7) ms | α → ^{262}BhSF ^{}div | > 75 % < 25 % | 10.996(25) MeV | AL |

Mt-267 | - unknown - | AL | |||

Mt-268 | 21(+8-5) ms | α → ^{264}Bh | ca. 100 % | 10.67(15) MeV | AL |

Mt-268m | 0.07(+10-3) ms | α → ^{264}Bh | AL | ||

Mt-269 | - unknown - | AL | |||

Mt-270 | 0.48 s | α → ^{266}Bh | ca. 100 % | 10.18(5) MeV | AL |

Mt-270m | 1.1 s | α → ^{266}Bh | AL | ||

Mt-271 | - unknown - | AL | |||

Mt-272 | - unknown - | AL | |||

Mt-273 | - unknown - | AL | |||

Mt-274 | 0.44(+81-17) s | α → ^{270}BhSF ^{}div | ca. 100 % ? | 10.595(230) MeV | AL |

Mt-275 | 20 ms | α → ^{271}BhSF ^{}div | ca. 100 % ≤ 25 % | 10.483(51) MeV | AL |

Mt-276 | 0.69(+9-7) s | α → ^{272}Bh | ca. 100 % | 10.100(10) MeV | AL |

Mt-277 | 4 ms | SF ^{}divα → ^{273}Bh | ca. 100 % ≤ 20 % | 9.90(10) MeV | AL |

Mt-278 | 4.5(+35-13) s | α → ^{274}BhSF ^{}div | ca. 100 % ? | 9.580(30) MeV | AL |

Mt-282 | 1.1 min | α → ^{278}BhSF ^{}div | ca. 100 % ? | 8.66(20) MeV | AL |

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 Meitnerium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to ^{12}C = 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 Meitnerium 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 Meitnerium 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.

**Meitnerium: 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

**Perma link**: https://www.chemlin.org/chemical-elements/meitnerium-isotopes.php

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