Author(s)

S. R. Hashemi-Nezhad¹, Reinhard Brandt², Wolfram Westmeier^2,3

¹School of Physics, University of Sydney, NSW 2006, Australia.
²Kernchemie, FB Chemie, Philipps Universität, Marburg, Germany.
³Dr. Westmeier GmbH, Ebsdorfergrund, Germany.

Marinov et al. have detected spontaneous fission events in sources separated from tungsten targets irradiated with 24 GeV protons. These fission events could not be attributed to actinides or to any other known isotope. Marinov et al. propose that fission events are due to production of element 112 (Eka-Hg) in the tungsten target. We have addressed Marinov’s claim with a new analysis of their data and modern theoretical model calculations of possible interactions. Using data available in the literature the spontaneous fission half-life of the Eka-Hg was estimated to be ～74 days. This is dramatically longer than the half-life obtained for ²⁸³₁₁₂Cn, produced in the fusion of energetic ⁴⁸Ca ions with 238U. Monte Carlo calculations show that enough Sr isotopes are produced in the tungsten target to make the production of element 112 via fusion of Sr and W feasible; however, if such fusion was possible it had to be deep sub-barrier fusion.

Element 112, Tungsten Target, Spallation Products, Heavy Ion Fusion

Hashemi-Nezhad, S. , Brandt, R. and Westmeier, W. (2018) Reexamination of the Claim of Marinov et al. on Discovery of Element 112. World Journal of Nuclear Science and Technology, 8, 147-159. doi: 10.4236/wjnst.2018.84013.