Physics of Elementary Particles and Atomic Nuclei
|Archive (1970 - 2015)||Editorial board||Guidance for Authors|
Volume 47 (year 2016) , parts: 1
Adamian G.G., Antonenko N.V., Kalandarov Sh.A.
Description of the Quasifission Reactions in the Framework of Dinuclear System Model (rus, 1.8 Mb)
Formation and evolution of dinuclear system in quasifission reactions are considered. In the framework of dinuclear system concept the processes of formation of reaction products are investigated. Isotopic dependence of formation cross sections of superheavy nuclei in quasifission reactions is considered. The yields of new neutron-rich isotopes of nuclei with Z = 64 - 80 in quasifission reactions are predicted. The mechanism of complex fragment formation in complete fusion and quasifission reactions is analyzed.
Artukh A.G., Klygin S.A., Kononenko G.A., Kyslukha D.A., Lukyanov S.M., Mikhailova T.I., Oganessian Yu.Ts., Penionzhkevich Yu.E., Sereda Yu.M., Vorontsov A.N., Erdemchimeg B.
Radioactive Nuclear Beams of COMBAS Facility (eng, 1.2 Mb)
The basic ion-optical characteristics of the high-luminosity and high-resolution kinematic separator COMBAS, realized for the first time on the strong focusing principle, are presented. The developed facility allows one to separate the high-intensity secondary radioactive beams in a wide range of mass numbers A and atomic numbers Z, which are produced in heavy-ion reactions in the energy range of 20 E 100 MeV/A (Fermi energy domain). Two distinct detector systems, such as realized Si strip-detector telescope and the three-dimensional time-projection chamber of promising development, are discussed. A program of the investigations of nuclear reaction mechanisms at intermediate energies of 20-100 MeV/A, measurement of the radii of unstable nuclei, study of the cluster structure of light nuclei near the nuclear drip-line, and search for 26,28Î resonances in exchange reactions is proposed. The upgrading of experimental facility by the integration of COMBAS separator with the ion catcher is discussed.
Experiment Automation at the Dubna Gas-Filled Recoil Separator (rus, 3.3 Mb)
Different approaches to solving tasks related to the automation of main processes in long-term experiments with heavy-ion beams at the Dubna gas-filled recoil separator (DGFRS) are examined. Techniques in the field of spectroscopy of rare -decays of superheavy nuclei and approaches to the development of control systems which ensure fail-safety when conducting experiments with extremely radioactive targets and registration of the main parameters of experiments are described. The specificity of DSSSD (Double Side Silicon Strip Detector) detectors is examined. A special emphasis is placed on the role of edge phenomena of neighboring p-n junctions when the method for "active correlations" is applied. An example of a beam-free experiment is briefly examined in an attempt to observe the Zeno effect. The main examples are specified for nuclear complete fusion reactions with beams of 48Ca accelerated by the U-400 cyclotron at FLNR, JINR.
From the Electron Avalanche to Lightning Discharge (rus, 650 Kb)
The work gives a qualitative description of the physics of the processes beginning with an electron avalanche and ending with a lightning discharge. A streamer model is considered that is based on the investigation of the observed new processes occurring in the prestreamer region. The study and analysis of these processes allow a conclusion that they are actually accompanying processes to support transition of an electron avalanche to a streamer and can be interpreted as a manifestation of the properties of the double charge layer in an external electric field. Important problems of physical processes underlying formation of a lightning discharge are considered on the basis of the new concept of streamer formation and intergrowth. Causes for coherent microwave leader radiation and neutron generation in a lightning discharge that have not yet been explained in the gas discharge theory are disclosed. A simple globe lightning model is also proposed on the basis of the new concept, which allows answering all questions arising from the observation of the globe lightning behavior, and a necessity of changing over from the traditional lightning rod to a lightning guard of a new design is discussed.
Synopsis (rus, 51 Kb)
V. A. Matveev
V. L. Aksenov, Nguen Van Hieu
A. B. Arbuzov,
V. A. Bednyakov,
V. V. Burov,
M. A. Vasiliev,
V. V. Voronov,
R. V. Jolos,
P. I. Zarubin,
G. M. Zinovjev,
A. P. Isaev (Secretary),
E. A. Krasavin,
N. V. Krasnikov,
O. N. Krokhin,
E. V. Lychagin,
I. N. Meshkov,
Yu. Ts. Oganessian,
A. G. Popeko,
A. A. Starobinskii,
G. V. Trubnikov,
V. I. Yukalov
G. V. Fedorova
G. I. Smirnov