Asymmetric and symmetric fission of excited nuclei of Hg 180,190 and Pb 184,192,202 formed in the reactions with Ar 36 and Ca 40,48 ions
Bogachev A.A. Kozulin E.M. Knyazheva G.N. Itkis I.M. Itkis M.G. Novikov K.V. Kumar D. Banerjee T. Diatlov I.N. Cheralu M. Kirakosyan V.V. Mukhamejanov Y.S. Pan A.N. Pchelintsev I.V. Tikhomirov R.S. Vorobiev I.V. Maiti M. Prajapat R. Kumar R. Sarkar G. Trzaska W.H. Andreyev A.N. Harca I.M. Vardaci E.
August 2021American Physical Society
Physical Review C
2021#104Issue 2
Background: Observation of asymmetric fission of Hg180 has led to intensive theoretical and experimental studies of fission of neutron-deficient nuclei in the lead region. Purpose: The study of asymmetric and symmetric fission modes of Hg180,190 and Pb184,192,202 nuclei. Methods: Mass-energy distributions of fission fragments of Hg180,190 and Pb184 formed in the Ar36+Sm144,154 and Ca40+Sm144 reactions, respectively, at energies near the Coulomb barrier have been measured using the double-arm time-of-flight spectrometer CORSET and compared with previously measured Pb192,202 isotopes produced in the Ca48+Sm144,154 reactions. The mass distributions for Hg180,190 and Pb184,192,202 together with old data for Ir187, Au195, Hg198, Tl201, Bi205,207, Po210, and At213 [J. Nucl. Phys. 53, 1225 (1991)] have been decomposed into symmetric and asymmetric fission modes. The total kinetic-energy distributions for different fission fragment mass regions have been analyzed for Hg180,190 and Pb184. Results: The stabilization role of proton numbers at Z≈36, 38, Z≈45, 46, and Z=28/50 in asymmetric fission of excited preactinide nuclei has been observed. The high (≈145-MeV) and the low (≈128-MeV) energy components have been found in the total kinetic-energy distributions of Hg180,190 fission fragments corresponding to the fragments with proton numbers near Z≈46 and Z≈36, respectively. In the case of fission of Pb184 only the low-energy component (≈135MeV) for the fragments with masses corresponding to the proton numbers Z≈36 and 46 has been found. Conclusions: The studied properties of asymmetric fission of Hg180,190 and Pb184,192,202 nuclei point out the existence of well deformed proton shell at Z≈36 and less deformed proton shell at Z≈46.
Text of the article Перейти на текст статьи
Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany
Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Department of Physics, Indian Institute of Technology, Uttarakhand, Roorkee, 247667, India
Department of Physics, University of Jyväskylä, Jyväskylä, FIN-40014, Finland
Department of Physics, University of York, York, YO10 5DD, United Kingdom
Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki, Tokai, 319-1195, Japan
Facility for Rare Isotope Beams, Michigan State University, East Lansing, 48824, MI, United States
Horia Hulubei National Institute for RandD in Physics and Nuclear Engineering, Bucharest-Magurele, Romania
Dipartimento di Fisica E. Pancini, Universita Degli Studi di Napoli Federico II, Napoli, 80126, Italy
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, 80126, Italy
Flerov Laboratory of Nuclear Reactions
GSI Helmholtzzentrum für Schwerionenforschung
Institute of Nuclear Physics
Al-Farabi Kazakh National University
Department of Physics
Department of Physics
Department of Physics
Advanced Science Research Center
Facility for Rare Isotope Beams
Horia Hulubei National Institute for RandD in Physics and Nuclear Engineering
Dipartimento di Fisica E. Pancini
Istituto Nazionale di Fisica Nucleare
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026