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Title: The Peculiarities of the Production and Decay of Superheavy Nuclei

Abstract

The interest in the study of the fission process of superheavy nuclei mainly deals with the opportunity to obtain information about the cross-section of the compound nucleus (CN) formation at excitation energies E*{approx_equal}15-30 MeV. It allows one to estimate the survival probability of the superheavy composite system after evaporation of 1-3 neutrons, i.e. in 'cold' or 'warm' fusion reactions. However, in order to solve this problem deeper understanding of the coalescence processes between colliding nuclei, the competition between fusion-fission and quasi-fission processes is needed. The characteristics of both processes, their manifestation in the experimental observables and the relative contribution to the capture cross-section in dependence on the excitation energies, reaction entrance channel etc were investigated for a wide range of target-projectile combinations. Results of the experiments devoted to the study of the fusion-fission and quasi-fission processes in the reactions of the formation of the superheavy nuclei with Z = 102-122 are presented. The heavy ions 26Mg, 48Ca, 50Ti, 58Fe and 64Ni were used as projectiles. The choice of the reactions with 48Ca and actinide-targets was inspired by the experiments on the production of the isotopes 283112, 289114 and 283116 in Dubna using the same reactions. The 50Ti, 58Fe and 64Nimore » projectiles were chosen since the corresponding projectile-target combinations lead to the synthesis of even heavier elements. The experiments were carried out at the U-400 accelerator of the Flerov Laboratory of Nuclear Reactions (JINR, Russia) and the XTU Tandem accelerator of the National Laboratory of Legnaro (LNL, Italy) using the time-of-flight spectrometer of fission fragments CORSET. The role of the shell effects, the influence of the entrance channel asymmetry and the deformations of colliding nuclei on the mechanism of the fusion-fission and the competitive process of quasi-fission are discussed. The recent results on synthesis of superheavy nuclei and the perspectives of the ''hot'' fusion reaction for the production of superheavy nuclei are considered.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; ; ;  [2]; ; ;  [3]
  1. Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna (Russian Federation)
  2. INFN, Padova (Italy)
  3. INFN, Laboratori Nazionali di Legnaro, Legnaro (Padova) Italy (Italy)
Publication Date:
OSTI Identifier:
20888141
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 853; Journal Issue: 1; Conference: FUSION06: International conference on reaction mechanisms and nuclear structure at the Coulomb barrier, Venice (Italy), 19-23 Mar 2006; Other Information: DOI: 10.1063/1.2338383; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CALCIUM 48 BEAMS; CALCIUM 48 REACTIONS; CAPTURE; COMPOUND NUCLEI; CROSS SECTIONS; EXCITATION; FISSION; FISSION FRAGMENTS; HEAVY ION FUSION REACTIONS; IRON 58 BEAMS; IRON 58 REACTIONS; MAGNESIUM 26 REACTIONS; NICKEL 64 REACTIONS; NUCLEAR DECAY; QUASI-FISSION; TANDEM ELECTROSTATIC ACCELERATORS; TIME-OF-FLIGHT SPECTROMETERS; TITANIUM 50 BEAMS; TITANIUM 50 REACTIONS; TRANSACTINIDE ELEMENTS

Citation Formats

Itkis, M G, Bogachev, A A, Itkis, I M, Jandel, M, Kliman, J, Knyazheva, G N, Kondratiev, N A, Kozulin, E M, Krupa, L, Oganessian, Yu Ts, Pokrovsky, I V, Prokhorova, E V, Rusanov, A Ya, Sagaidak, R N, Beghini, S, Montagnoli, G, Scarlassara, F, Universita di Padova, Padova, Behera, B R, Corradi, L, and Fioretto, E. The Peculiarities of the Production and Decay of Superheavy Nuclei. United States: N. p., 2006. Web. doi:10.1063/1.2338383.
Itkis, M G, Bogachev, A A, Itkis, I M, Jandel, M, Kliman, J, Knyazheva, G N, Kondratiev, N A, Kozulin, E M, Krupa, L, Oganessian, Yu Ts, Pokrovsky, I V, Prokhorova, E V, Rusanov, A Ya, Sagaidak, R N, Beghini, S, Montagnoli, G, Scarlassara, F, Universita di Padova, Padova, Behera, B R, Corradi, L, & Fioretto, E. The Peculiarities of the Production and Decay of Superheavy Nuclei. United States. https://doi.org/10.1063/1.2338383
Itkis, M G, Bogachev, A A, Itkis, I M, Jandel, M, Kliman, J, Knyazheva, G N, Kondratiev, N A, Kozulin, E M, Krupa, L, Oganessian, Yu Ts, Pokrovsky, I V, Prokhorova, E V, Rusanov, A Ya, Sagaidak, R N, Beghini, S, Montagnoli, G, Scarlassara, F, Universita di Padova, Padova, Behera, B R, Corradi, L, and Fioretto, E. 2006. "The Peculiarities of the Production and Decay of Superheavy Nuclei". United States. https://doi.org/10.1063/1.2338383.
@article{osti_20888141,
title = {The Peculiarities of the Production and Decay of Superheavy Nuclei},
author = {Itkis, M G and Bogachev, A A and Itkis, I M and Jandel, M and Kliman, J and Knyazheva, G N and Kondratiev, N A and Kozulin, E M and Krupa, L and Oganessian, Yu Ts and Pokrovsky, I V and Prokhorova, E V and Rusanov, A Ya and Sagaidak, R N and Beghini, S and Montagnoli, G and Scarlassara, F and Universita di Padova, Padova and Behera, B R and Corradi, L and Fioretto, E},
abstractNote = {The interest in the study of the fission process of superheavy nuclei mainly deals with the opportunity to obtain information about the cross-section of the compound nucleus (CN) formation at excitation energies E*{approx_equal}15-30 MeV. It allows one to estimate the survival probability of the superheavy composite system after evaporation of 1-3 neutrons, i.e. in 'cold' or 'warm' fusion reactions. However, in order to solve this problem deeper understanding of the coalescence processes between colliding nuclei, the competition between fusion-fission and quasi-fission processes is needed. The characteristics of both processes, their manifestation in the experimental observables and the relative contribution to the capture cross-section in dependence on the excitation energies, reaction entrance channel etc were investigated for a wide range of target-projectile combinations. Results of the experiments devoted to the study of the fusion-fission and quasi-fission processes in the reactions of the formation of the superheavy nuclei with Z = 102-122 are presented. The heavy ions 26Mg, 48Ca, 50Ti, 58Fe and 64Ni were used as projectiles. The choice of the reactions with 48Ca and actinide-targets was inspired by the experiments on the production of the isotopes 283112, 289114 and 283116 in Dubna using the same reactions. The 50Ti, 58Fe and 64Ni projectiles were chosen since the corresponding projectile-target combinations lead to the synthesis of even heavier elements. The experiments were carried out at the U-400 accelerator of the Flerov Laboratory of Nuclear Reactions (JINR, Russia) and the XTU Tandem accelerator of the National Laboratory of Legnaro (LNL, Italy) using the time-of-flight spectrometer of fission fragments CORSET. The role of the shell effects, the influence of the entrance channel asymmetry and the deformations of colliding nuclei on the mechanism of the fusion-fission and the competitive process of quasi-fission are discussed. The recent results on synthesis of superheavy nuclei and the perspectives of the ''hot'' fusion reaction for the production of superheavy nuclei are considered.},
doi = {10.1063/1.2338383},
url = {https://www.osti.gov/biblio/20888141}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 853,
place = {United States},
year = {Mon Aug 14 00:00:00 EDT 2006},
month = {Mon Aug 14 00:00:00 EDT 2006}
}