Chemical identification of dubnium as a decay product of element 115 produced in the reaction 48Ca + 243Am

Experimental studies of the249Bk + 48Ca reaction including decay properties and excitation function for isotopes of element 117, and discovery of the new isotopeOganessian1, Abdullin2, Alexander3 et al. 2013Phys. Rev. C1377480View full textAdd to dashboardCite

“…In all these cases, no α particles with E α =7.7-8.2 MeV following decay of 272 Bh were found. The lack of α decays of 268 Db is in agreement with results of chemical experiments where SF activity, with the same half-life as it was measured in the DGFRS experiments [21], was observed in fraction of transactinide elements [22,23] [24], as it was discussed in [3]), then upper limits for their α-decay energies would be 7.7 and 8.0 MeV, respectively, if one assumes a hindrance factor of 25. Such a difference between predicted and estimated Q α values could be explained by lower α-decay energies than those given in [10] with uncertainty of 0.3 MeV and/or relatively high hindrance factors for α decay of these nuclei.…”

Discovery of the elements with atomic numbers Z = 113, 115 and 117 (IUPAC Technical Report)

“…The collaboration of Dmitriev et al [24,25] Am fusion reaction in 2005 to produce 15 additional spontaneous fission nuclides and other reaction products recoiling directly, without selectivity, onto a copper surface from which they were extracted and subjected to cation exchange separation. The technique employed was claimed to distinguish between Group 3 elements (lanthanides and actinides) and combined Groups 4 and 5.…”

Astrophysics in 2005

“…231 radio supernova remnants in the Milky Way (Green 2005a 115 protons in the nucleus of the most recently confirmed element (Dmitriev et al 2005). The story is second hand from Nature, who appear to have simplified somewhat.…”