Speaker
Dr
Andrey Popeko
(Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Russia)
Description
Over the past 15 years, the electrostatic recoil separator VASSILISSA has been used for investigations of evaporation residues (ERs) produced in heavy-ion fusion reactions. In the course of the experimental work, a bulk of data on ERs formation cross sections was collected. In 2004–2010, the isotopes of Fm, Md, No, and Lr were studied using the GABRIELA (Gamma Alpha Beta Recoil Investigations with the ELectromagnetic Analyzer) detector system. These experiments showed that the efficiency of the existing set-up was not sufficient.
The goals of the modernization of the VASSILISSA electrostatic separator were to increase the transmission of asymmetric reactions, like 22Ne + 238U or 16O + 244Pu products, by the factor of 2–3 and to extend the region of reactions to be investigated up to symmetric combinations like 136Xe + 136Xe. For this purpose, 3 electrostatic deflectors in the central part of the separator were replaced by a combination of two electrostatic and two magnetic deflectors. This modernization converted the energy selector VASSILISSA into the velocity filter SHELS. The new separator will be used together with the detector GABRIELA to carry out spectroscopic studies of heavy and superheavy isotopes. First tests of the set-up were performed with the beams of accelerated 22Ne, 40Ar, 48Ca, and 50Ti ions.
Primary author
Dr
Andrey Popeko
(Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Russia)
Co-authors
Dr
Alexander Yeremin
(Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Russia)
Dr
Araceli Lopez-Martens
(Centre de Sciences Nucleaires et de Sciences de la Matiere, IN2P3-CNRS, Orsay, France)
Dr
Karl Haushild
(Centre de Sciences Nucleaires et de Sciences de la Matiere, IN2P3-CNRS, Orsay, France)
Mr
Oleg Malyshev
(Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Russia)
Dr
Olivier Dorvaux
(Institut Pluridisciplinaire Hubert Curien, CNRS, Strasbourg, France)