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Isotopes of Dubnium

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

 

Dubnium isotopes

All of the atomic nuclei of the chemical element dubnium are summarized under dubnium isotopes; these consist of an atomic nucleus with 105 protons and in the uncharged state of 105 electrons. The difference between the individual dubnium isotopes lies in the number of neutrons in the nucleus - and thus in the mass number

Dubnium is an exclusively synthetically produced radioactive chemical element that is not known in nature.

The first man-made and proven nuclide was Dubnium-261 (1968). Since then, a total of 13 radioisotopes have been characterized, of which Db-268 has the longest half-life at 32 hours.

 

Isotope Table: Dubnium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
255Db105255150Dubnium-255255.10692(38) u
[255.0493282 u]
{99.59534 MeV}
256Db105256151Dubnium-256256.10789(26) u
[256.0502982 u]
{100.49889 MeV}
257Db105257152Dubnium-257257.10758(22) u
[257.0499882 u]
{100.21012 MeV}
(9/2+)261Bh
257mDb105257152Dubnium-257m257.10758(22) u
[257.0499882 u]
{100.21012 MeV}
(1/2-)
258Db105258153Dubnium-258258.10928(33) u
[258.0516882 u]
{101.79366 MeV}
(5+,6+)262Bh
258mDb105258153Dubnium-258m258.10928(33) u
[258.0516882 u]
{101.79366 MeV}
(1-)
259Db105259154Dubnium-259259.10949(6) u
[259.0518982 u]
{101.98928 MeV}
(9/2+)
260Db105260155Dubnium-260260.11130(10) u
[260.0537082 u]
{103.67528 MeV}
264Bh
261Db105261156Dubnium-261261.11198(12) u
[261.0543882 u]
{104.3087 MeV}
262Db105262157Dubnium-262262.11407(15) u
[262.0564782 u]
{106.25552 MeV}
266Bh
263Db105263158Dubnium-263263.11499(18) u
[263.0573982 u]
{107.1125 MeV}
264Db105264159Dubnium-264
265Db105265160Dubnium-265
266Db105266161Dubnium-266266.12103(30) u
[266.0634382 u]
{112.73872 MeV}
267Db105267162Dubnium-267267.12246(44) u
[267.0648682 u]
{114.07076 MeV}
268Db105268163Dubnium-268268.12567(57) u
[268.0680782 u]
{117.06085 MeV}
272Bh
269Db105269164Dubnium-269
270Db105270165Dubnium-270270.13130(66) u
[270.0737082 u]
{122.30516 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Db-255ca. 1.6 sα → 251Lr
SF div
ca. 80 %
ca. 20 %
9.44(20) MeV
AL
Db-256ca. 1.6 sSF div
EC → 256Rf
α → 252Lr
?
30(11) %
70(11) %

6.28(24) MeV
9.34(3) MeV
AL
Db-2572.3(2) sα → 253Lr
SF div
≥ 94 %
≤ 6 %
9.207(20) MeV
AL
Db-257m0.67(6) sα → 253Lr
SF div
≥ 87 %
≤ 6 %

370 keVAL
Db-2584.3(5) sα → 254Lr
EC/β+258Rf
77(8) %
23(8) %
9.50(5) MeV
5.46(31) MeV
AL
Db-258m1.9(5) sEC/β+258Rf
α → 254Lr
36(10) %
64(10) %

+x keVAL
Db-2590.51(16) sα → 255Lr?9.62(5) %AL
Db-2601.52(13) sα → 256Lr
SF div
EC → 259Rf
≥ 90.4(6) %
≤ 9.6(6) %
< 2.5 %
9.50(4) MeV

4.53(22) MeV
AL
Db-2611.8(4) sα → 257Lr
SF div
≥ 82 %
≤ 18 %
9.22(10) MeV
AL
Db-26235(5) sα → 258Lr
SF div
ca. 67 %
ca. 33 %
9.05(10) MeV
AL
Db-263ca. 27 sα → 259Lr
SF div
43(14) %
57(14) %
8.83(15) MeV
AL
Db-264- unbekannt -
Db-265- unbekannt -
Db-2660.4 hSF div
α → 262Lr
EC → 266Rf
ca. 100 %
?
?

8.21(20) MeV
AL
Db-267ca. 73 minSF div~ 100 %AL
Db-26828(3) hSF div
EC/β+268Rf
α → 264Lr
~ 100 %
?
?


8.26(30) MeV
AL
Db-269- unbekannt -
Db-27015(+10-4) hα 266Lr
SF div
?
~ 100 %
8.26(20) 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 Dubnium isotope.
6 - Relative atomic mass of the Dubnium 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 Dubnium 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 Dubnium 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.

Dubnium: 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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