Spectroscopy of the Isotopes of Transfermium Elements in Dubna: Current Status and Prospects
- PDF / 1,455,349 Bytes
- 10 Pages / 612 x 792 pts (letter) Page_size
- 23 Downloads / 151 Views
CLEI Experiment
Spectroscopy of the Isotopes of Transfermium Elements in Dubna: Current Status and Prospects A. V. Yeremin1), 2)* , A. G. Popeko1), 2) , O. N. Malyshev1), 2) , A. V. Isaev1) , A. A. Kuznetsova1) , Yu. A. Popov1), 2) , A. I. Svirikhin1), 2) , E. A. Sokol1), M. S. Tezekbayeva1), 3) , M. L. Chelnokov1), V. I. Chepigin1) , A. Lopez-Martens4), K. Hauschild4), O. Dorvaux5), B. Gall5) , J. Piot6) , S. Antalic7) , P. Mosat7) , D. Tonev8) , and E. Stefanova8) Received December 25, 2019; revised December 25, 2019; accepted December 25, 2019
Abstract—A great many experimental studies devoted to exploring in detail the properties of radioactive decay of the isotopes of transfermium elements by means of alpha, beta, and gamma spectroscopy have been performed over the past fifteen years at the Flerov Laboratory of Nuclear Reactions (Joint Institute for Nuclear Research, Dubna). High-intensity accelerated heavy-ion beams of 22 Ne, 48 Ca, 50 Ti, and 54 Cr from the U-400 cyclotron were used in experiments with the SHELS kinematic separator. An upgrade of the separator and detector system is planned in the future with the aim of improving the transportation efficiency for the nuclei under study and the detection efficiency for gamma rays. DOI: 10.1134/S1063778820040109
1. INTRODUCTION In recent years, x-ray and gamma-ray spectrometry have been used ever more widely in experiments aimed at studying the properties of radioactive decays of transfermium elements. Because of a moderately low detection efficiencies (as low as a few percent) and a broad set of possible x- and gamma-ray energies partly overlapping one another for different chemical elements, x-ray and gamma-ray detectors may only be applied as auxiliary identification means. Combined with detectors recording alpha and beta decays of heavy nuclei, gamma-detector systems are highly efficient in experiments devoted to synthesizing heavy nuclei and studying the properties of their radioactive decays. Positioned in the focal plane of the separator of recoil nuclei, they are subjected to background loads many orders of magnitude lower than those in experiments without separators. Therefore, refinements upon the experimental procedures and 1)
Joint Institute for Nuclear Research, Dubna, Russia. Dubna State University, Dubna, Russia. 3) Institute of Nuclear Physics, Almaty, Kazakhstan. 4) Center for Nuclear and Materials Science, IN2P3-CNRS, Orsay, France. 5) Hubert Curien Multi-Disciplinary Institute, IN2P3-CNRS, Strasbourg, France. 6) Grand Accelerateur National d’Ions Lourds, Caen, France. 7) Comenius University, Bratislava, Slovakia. 8) Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria. * E-mail: [email protected] 2)
an implementation of experiments with state-of-theart detector systems are of paramount importance in these realms. Various reaction types and identification methods were used to study in detail the radioactivedecay properties of the isotopes of transfermium elements and the production cross sections for these isotopes. In synthesizing superheavy
Data Loading...
