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Isotopes of Nobelium

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

 

Nobelium isotopes

All of the atomic nuclei of the chemical element nobelium are summarized under nobelium isotopes; these consist of an atomic nucleus with 102 protons and in the uncharged state of 102 electrons. The difference between the individual nobelium isotopes lies in the number of neutrons in the nucleus - and thus in the mass number.

 

Nobelium is an exclusively synthetically produced, highly radioactive chemical element that is not known in nature.

The first report on the production of a nobelium isotope appeared in 1957 from the Nobel Institute in Sweden, which also suggested the name; later, however, the claim to the discovery was withdrawn, citing measurement errors due to background effects.

In the years that followed, several groups from several countries reported on the synthesis of nobelium nuclides; Ultimately, the discovery (1966) was awarded to the Dubna research team in Russia.

To date, a total of 13 different nobelium isotopes have been produced, all of which are extremely short-lived; with a half-life of just under an hour, nobelium-259 is the most stable no-nuclide.

 

Isotope Table: Nobelium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
250No102250148Nobelium-250250.08756(21) u
[250.0316133 u]
{81.56161 MeV}
0+
250mNo102250148Nobelium-250m250.08756(21) u
[250.0316133 u]
{81.56161 MeV}
(6+)
251No102251149Nobelium-251251.08894(12) u
[251.0329933 u]
{82.84708 MeV}
(7/2+)255Rf
251mNo102251149Nobelium-251m251.08894(12) u
[251.0329933 u]
{82.84708 MeV}
(1/2+)
252No102252150Nobelium-252252.088966(10) u
[252.0330193 u]
{82.8713 MeV}
0+256Rf
253No102253151Nobelium-253253.090563(7) u
[253.0346163 u]
{84.35889 MeV}
(9/2-)257Rf
253mNo102253151Nobelium-253m253.090563(7) u
[253.0346163 u]
{84.35889 MeV}
5/2+
254No102254152Nobelium-254254.090954(10) u
[254.0350073 u]
{84.72311 MeV}
0+258Rf
254mNo102254152Nobelium-254m254.090954(10) u
[254.0350073 u]
{84.72311 MeV}
(8-)
255No102255153Nobelium-255255.093191(16) u
[255.0372443 u]
{86.80686 MeV}
(1/2+)259Rf
256No102256154Nobelium-256256.094281(8) u
[256.0383343 u]
{87.82219 MeV}
0+
257No102257155Nobelium-257257.096884(7) u
[257.0409373 u]
{90.24686 MeV}
(3/2+)261Rf
258No102258156Nobelium-258258.09820(11) u
[258.0422533 u]
{91.47271 MeV}
0+258Md
259No102259157Nobelium-259259.100998(7) u
[259.0450513 u]
{94.07903 MeV}
(9/2+)
260No102260158Nobelium-260260.10264(21) u
[260.0466933 u]
{95.60854 MeV}
0+
261No102261159Nobelium-261
262No102262160Nobelium-262262.10746(39) u
[262.0515133 u]
{100.09835 MeV}
0+

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
No-2504.2 μsSF < 100 % div.
α → 246Fm
> 98 %
< 2 %

8.95(20) MeV
AL
No-250m46 μsSF divca. 100 %1050 keV
No-2510.80(1) sEC/β+251Md
α → 247Fm
SF div
?
91 %
< 0.3 %
3.88(12) MeV
8.752(4) MeV
AL
No-251m1.02(3) sα → 247Fmca. 100 %106(6) keVAL
No-2522.44(4) sSF div.
α → 248Fm
EC/β+252Md
32.2(5) %
66.7(6) %
1.1(4) %

8.549(5) MeV
2.36(13) MeV
AL
No-2531.62(15) minEC/β+253Md
α → 249Fm
45(3) %
55(3) %
3.19(3) MeV
8.415(4) MeV
AL
No-253m31.1(21) μs167.5(5) keVAL
No-25451.2(4) sEC → 254Md
α → 250Fm
SF div.
10(1) %
90(1) %
0.17(2) %
1.27(10) MeV
8.226(8) MeV
AL
No-254m265(2) msIso → 254No
SF div.
α → 250Fm
ca. 100 %
0.020(12) %
≤ 0.01 %


1296.4(11) keVAL
No-2553.52(21) minEC/β+255Md
α → 251Fm
70(5) %
30(5) %
1.964(16) MeV
8.428(3) MeV
AL
No-2562.91(5) sα → 252Fm
SF div.
99.47(6) %
0.53(6) %
8.582(5) MeV
AL
No-25724.5(5) sα → 253Fm
EC → 257Md
SF div.
85(15) %
≤ 30 %
< 1.5 %
8.477(6) MeV
1.254(7) MeV
AL
No-2581.2(2) msSF div.≤ 100 %AL
No-25958(5) minα → 255Fm
EC/β+259Md
SF div.
75(4) %
25(4) %
< 10 %
7.854(5) MeV
0.45(20) MeV
AL
No-260106(8) msSF div.100 %AL
No-261- unbekannt -AL
No-2625 msSF div.100 %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 Nobelium isotope.
6 - Relative atomic mass of the Nobelium 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 Nobelium 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 Nobelium 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.

Nobelium: 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.

[9] - Mustapha Laatiaoui et al.:
Atom-at-a-time laser resonance ionization spectroscopy of nobelium.
In: Nature, (2016), DOI 10.1038/nature19345.

[10] - Mustapha Laatiaoui et al.:
Probing Sizes and Shapes of Nobelium Isotopes by Laser Spectroscopy.
In: Physical Review Letters, (2018), DOI 10.1103/PhysRevLett.120.23250.

 


Category: Isotopes

Last update: 05.07.2020



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