Cross Section Limits for the ${}^{208}$Pb(${}^{86}$Kr,n)${}^{293}$118 Reaction

Abstract

In April-May, 2001, the previously reported experiment to synthesize element 118 using the ${}^{208}$Pb(${}^{86}$Kr,n)${}^{293}$118 reaction was repeated. No events corresponding to the synthesis of element 118 were observed with a total beam dose of 2.6 x 10${}^{18}$ ions. The simple upper limit cross sections (1 event) were 0.9 and 0.6 pb for evaporation residue magnetic rigidities of 2.00 $Tm$ and 2.12 $Tm$, respectively. A more detailed cross section calculation, accounting for an assumed narrow excitation function, the energy loss of the beam in traversing the target and the uncertainty in the magnetic rigidity of the Z=118 recoils is also presented. Re-analysis of the primary data files from the 1999 experiment showed the reported element 118 events are not in the original data. The current results put constraints on the production cross section for synthesis of very heavy nuclei in cold fusion reactions.

7 pages, 2 figures. Submitted to EPJA

References in corpus (7)

• Shell Corrections of Superheavy Nuclei in Self-Consistent Calculations
• Shell stabilization of super- and hyperheavy nuclei without magic gaps
• Fission barriers of neutron-rich and superheavy nuclei calculated with the ETFSI method
• alpha-decay chains of Z=114, A=289 and Z=118, A=293 in the relativistic mean-field model
• Nuclei, Superheavy Nuclei and Hypermatter in a chiral SU(3)-Modell
• The structure of superheavy elements newly discovered in the reaction of ${}^{86}$Kr with ${}^{208}$Pb
• Extrapolation of mean-field models to superheavy nuclei

Cited by in corpus (4)

• Formation of superheavy nuclei in cold fusion reactions
• Production of heavy and superheavy nuclei in massive fusion reactions
• Particle transfer and fusion cross-section for Super-heavy nuclei in dinuclear system
• What perspectives for the synthesis of heavier superheavy nuclei? Results and comparison with models