Modernization of the detector system at the recoil separator Vassilissa

Since the past 10 years, the recoil separator VASSILISSA has been used for the investigations of evaporation residues produced in heavy-ion-induced complete fusion reactions. In the course of experimental work in the region of the elements with 92≤Z≤94, 14 new isotopes have been identified by the parent-daughter correlations. For further experiments aimed at the synthesis of the superheavy element isotopes (Z≥110) with intensive 48Ca extracted beams, improvements in the focal plane detector system have been made. As a result, energy and position resolutions of the detectors have been significantly improved, the detection efficiency for the α-particles, emitted from the implanted into the focal plane detector recoil nuclei, has been increased to 85%. The decay properties of the new isotope of element 112 and the isotope of the new element 114 with mass 287 have been measured in two-nuclei decays