Isotopes of dubnium

Isotopes of dubnium (105Db)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
262Db synth 34 s[2][3] α67% 258Lr
SF33% –
263Db synth 27 s[3] SF56% –
α41% 259Lr
ε3% 263mRf
266Db synth 11 min[4] SF –
ε 266Rf
267Db synth 1.4 h[4] SF –
268Db synth 16 h[5] SF –
ε 268Rf
α[5] 264Lr
270Db synth 1 h[6] SF17% –
α83% 266Lr

Dubnium (105Db) is a synthetic element, thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 261Db in 1968. Thirteen radioisotopes are known, ranging from 255Db to 270Db (except 264Db, 265Db, and 269Db), along with one isomer (257mDb); two more isomers have been reported but are unconfirmed. The longest-lived known isotope is 268Db with a half-life of 16 hours.

  1. ^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  2. ^ Münzenberg, G.; Gupta, M. (2011). "Production and Identification of Transactinide Elements". Handbook of Nuclear Chemistry. Springer. p. 877. doi:10.1007/978-1-4419-0720-2_19.
  3. ^ a b Six New Isotopes of the Superheavy Elements Discovered. Berkeley Lab. News center. October 26, 2010
  4. ^ a b Oganessian, Yu. Ts.; Utyonkov, V. K.; Kovrizhnykh, N. D.; et al. (2022). "New isotope 286Mc produced in the 243Am+48Ca reaction". Physical Review C. 106 (064306). doi:10.1103/PhysRevC.106.064306.
  5. ^ a b Oganessian, Yu. Ts.; Utyonkov, V. K.; Kovrizhnykh, N. D.; et al. (29 September 2022). "First experiment at the Super Heavy Element Factory: High cross section of 288Mc in the243Am+48Ca reaction and identification of the new isotope 264Lr". Physical Review C. 106 (3): L031301. doi:10.1103/PhysRevC.106.L031301. S2CID 252628992.
  6. ^ Khuyagbaatar, J.; Yakushev, A.; Düllmann, Ch. E.; et al. (2014). "48Ca+249Bk Fusion Reaction Leading to Element Z=117: Long-Lived α-Decaying 270Db and Discovery of 266Lr". Physical Review Letters. 112 (17): 172501. Bibcode:2014PhRvL.112q2501K. doi:10.1103/PhysRevLett.112.172501. hdl:1885/148814. PMID 24836239. S2CID 5949620.