Abstract
In preparation for recent experiments on the synthesis of superheavy nuclei with in the reaction we modified the Dubna gas-filled recoil separator and its detection system and carried out bombardments of lead targets with projectiles. We studied excitation functions of the reactions and Maximum cross sections for the evaporation of 1–4 neutrons in the complete fusion reaction were measured to be and In the bombardment of an enriched target, we simultaneously obtained excitation functions of the reactions induced on the isotopic admixtures present in the target material. The maximum cross sections for the evaporation of two neutrons from the compound nuclei and were measured to be 2.1 1.3 and 10 nb, respectively. The spontaneously fissioning even-even isotope with a half-life was identified for the first time in this experiment. In the reaction we measured the excitation function for the production of the 21-ms spontaneously fissioning isotope confirming our preliminary identification of this nuclide based on the results of cross bombardments.
- Received 27 April 2001
DOI:https://doi.org/10.1103/PhysRevC.64.054606
©2001 American Physical Society