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Isotopes of Roentgenium

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


Roentgenium isotopes


Isotope Table: Roentgenium


Atomic Properties

ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
272Rg111272161Roentgenium-272272.15327(25) u
[272.092388 u]
{142.77009 MeV}
5+, 6+
274Rg111274163Roentgenium-274274.15525(19) u
[274.094368 u]
{144.61444 MeV}
278Rg111278167Roentgenium-278278.16159(38) u
[278.100708 u]
{150.52012 MeV}
279Rg111279168Roentgenium-279279.16294(45) u
[279.102058 u]
{151.77763 MeV}
280Rg111280169Roentgenium-280280.16520(57) u
[280.104318 u]
{153.88281 MeV}
281Rg111281170Roentgenium-281281.16672(86) u
[281.105838 u]
{155.29868 MeV}
282Rg111282171Roentgenium-282282.1694(7) u
[282.108518 u]
{157.79508 MeV}


Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
Rg-2720.0038 sα → 268Mt11.197 MeVAL
Rg-273- unbekannt -
Rg-2740.012 sα → 270Mt11.480 MeVAL
Rg-275- unbekannt -
Rg-276- unbekannt -
Rg-277- unbekannt -
Rg-2780.0042 sα → 274Mt
SF ?

10.850 MeV
Rg-2790.17 sα → 275Mt10.520 MeVAL
Rg-2804.4 sα → 276Mt10.146 MeVAL
Rg-28126 sSP → div
α ? 277Mt

9.9 MeV
Rg-282100 sα → 278Mt
SP → ?

9.64 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 Roentgenium isotope.
6 - Relative atomic mass of the Roentgenium 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 Roentgenium 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 Roentgenium 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.

Roentgenium: 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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