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Isotopes of Meitnerium

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

 

Meitnerium isotopes

 

Isotope Table: Meitnerium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
266Mt109266157Meitnerium-266266.13737(33) u
[266.0775847 u]
{127.95933 MeV}
267Mt109267158Meitnerium-267
268Mt109268159Meitnerium-268268.13865(25) u
[268.0788647 u]
{129.15164 MeV}
(5+,6+)
268mMt109268159Meitnerium-268m268.13865(25) u
[268.0788647 u]
{129.15164 MeV}
269Mt109269160Meitnerium-269
270Mt109270161Meitnerium-270270.14032(18) u
[270.0805347 u]
{130.70724 MeV}
270mMt109270161Meitnerium-270m270.14033(18) u
[270.0805447 u]
{130.71655 MeV}
271Mt109271162Meitnerium-271
272Mt109272163Meitnerium-272
273Mt109273164Meitnerium-273
274Mt109274165Meitnerium-274274.14734(38) u
[274.0875547 u]
{137.24633 MeV}
275Mt109275166Meitnerium-275275.14904(45) u
[275.0892547 u]
{138.82987 MeV}
276Mt109276167Meitnerium-276276.15171(57) u
[276.0919247 u]
{141.31695 MeV}
277Mt109277168Meitnerium-277277.15348(75) u
[277.0936947 u]
{142.9657 MeV}
278Mt109278169Meitnerium-278278.15645(67) u
[278.0966647 u]
{145.73224 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Mt-2662.1(7) msα → 262Bh
SF div
>; 75 %
< 25 %
10.996(25) MeV
AL
Mt-267- unbekannt -AL
Mt-26821(+8-5) msα → 264Bhca. 100 %10.67(15) MeVAL
Mt-268m0.07(+10-3) msα → 264BhAL
Mt-269- unbekannt -AL
Mt-27048 sα → 266Bhca. 100 %10.18(5) MeVAL
Mt-270m1.1 sα → 266BhAL
Mt-271- unbekannt -AL
Mt-272- unbekannt -AL
Mt-273- unbekannt -AL
Mt-2740.44(+81-17) sα → 270Bh
SF ?
ca. 100 %
10.59(21) MeV
AL
Mt-2759.7 msα → 271Bhca. 100 %10.48(5) MeVAL
Mt-2760.69(+9-7) sα → 272Bhca. 100 %10.100(9) MeVAL
Mt-2775(+9-2) sSF
α → 273Bh
ca. 100 %
?

9.91(10) MeV
AL
Mt-2784.5(+35-17) sα → 274Bh
SF div
ca. 100 %
?
9.63(5) MeV
AL

 

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 Meitnerium isotope.
6 - 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 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 Meitnerium 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]).

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.

 

Literature Sources and References

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.

 


Category: Isotopes

Last update: 05.07.2020



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