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Isotopes of dubnium



Dubnium (Db) has no stable isotopes. A standard atomic mass cannot be given.

Additional recommended knowledge

Dubnium has also been called hahnium, joliotium, and nielsbohrium.

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
255Db 105 150 255.10740(45)# 1.7(5) s [1.6(+6-4) s]
256Db 105 151 256.10813(31)# 1.9(4) s [1.6(+5-3) s]
257Db 105 152 257.10772(24)# 1.53(17) s [1.50(+19-15) s] (9/2+)
257mDb 100(100)# keV 790(130) ms [0.76(+15-11) s] (1/2-)
258Db 105 153 258.10923(37)# 4.5(6) s
258mDb 60(100)# keV 20(10) s
259Db 105 154 259.10961(23)# 0.51(16) s
260Db 105 155 260.11130(25)# 1.52(13) s
261Db 105 156 261.11206(25)# 1.8(4) s
262Db 105 157 262.11408(20)# 35(5) s
263Db 105 158 263.11499(18)# 29(9) s [27(+10-7) s]
264Db 105 159 264.11740(25)# 3# min
265Db 105 160 265.1186(3)# 15# min
266Db 105 161 266.12103(39)# 20# min
267Db 105 162 267.12238(50)# 73(+350-33) min
268Db 105 163 268.12545(57)# 32(+11-7) h
269Db 105 164 269.12746(83)# 3# h
270Db 105 165 270.13071(77)# 1# h

Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

  • Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
  • Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
  • Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
    • Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
    • National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
    • David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.


Isotopes of rutherfordium Isotopes of dubnium Isotopes of seaborgium
Index to isotope pages
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_dubnium". A list of authors is available in Wikipedia.
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