The isotopes259106,260106, and261106

How well do we understand the synthesis of heavy elements by heavy-ion induced fusion?

“…As can be seen, this does not influence the conclusion. In contrast, the calculation misses by a factor of 300_+ 100 the cross section for S4Cr+Z~ [45] (bottom panel). This factor can directly be taken as the relative fusion hindrance in the lead-based system.…”

Production of Even-Even Superheavy Nuclei in Cold Fusion Reactions

“…Within our model, we have reproduced in Ref. [18] the cross sections of the reactions 208 Pb 126 ͑HI, 1n͒ leading to odd-N transactinide nuclei [2,17,20,21] and predicted the increased probability of the production of element 118 in the reaction 208 Pb 126 ͑ 86 Kr 50 , 1n͒ 293 118 175 . This result, followed by our study of the properties of the predicted a-decay chain initiated by 293 118 175 [22], has prompted an experiment on the production of elements 118 and 116, which was recently performed at Berkeley [23].…”

“…+ b, 24.60.Dr, 25.70.Jj Only three even-even transactinide nuclei, 256 Rf 152 [1], 260 Sg 154 [2], and 264 Hs 156 [3,4], were synthesized in bombardments of 207 Pb 125 with heavy ions. The isotope 264 Hs 156 , produced in the reaction 207 Pb 125 ͑ 58 Fe 32 , 1n͒ 264 Hs 156 [3], is the heaviest experimentally known even-even nucleus.…”

Extraction of Nb and Ta, homolgues of Db, from sulphuric acid solutions with TOA in toluene using SISAK

“…Thus, more symmetric reactions like 208 Pb ( 51 V,n) 258 Db or 209 Bi ( 50 Ti,n) 258 Db must be used, which yield more than 40 MeV recoil energy for the dubnium atoms produced. Unfortunately, the cross sections [30] for such reactions are rather low, only of the order of a few nb. Thus, only 5-10 258 Db atoms can be produced per hour with current beam intensities and separator efficiencies.…”