Fission of

Kozulin E.M. Knyazheva G.N. Itkis I.M. Itkis M.G. Mukhamejanov Y.S. Bogachev A.A. Novikov K.V. Kirakosyan V.V. Kumar D. Banerjee T. Cheralu M. Maiti M. Prajapat R. Kumar R. Sarkar G. Trzaska W.H. Andreyev A.N. Harca I.M. Mitu A. Vardaci E.
January 2022 American Physical Society

Physical Review C
2022 #105 Issue 1

Background: The nature of asymmetric fission of preactinides is not yet understood in detail, despite intense experimental and theoretical studies carried out at present. Purpose: The study of asymmetric and symmetric fission of Hg180,182,183 and Pt178 nuclei as a function of their excitation energy and isospin. Methods: Mass-energy distributions of fission fragments of Hg180, Pt178 (two protons less than Hg180), and Hg182 (two neutrons more than Hg180) formed in the Ar36+Sm144, Nd142, and Ca40+Nd142 reactions were measured at energies near and above the Coulomb barrier. Fission of Hg183 obtained in the reaction of Ca40 with Nd143 was also investigated to see if one extra neutron could lead to dramatic changes in the fission process due to the shape-staggering effect in radii, known in Hg183. The measurements were performed with the double-arm time-of-flight spectrometer CORSET. Results: The observed peculiarities in the fission fragment mass-energy distributions for all studied nuclei may be explained by the presence of a symmetric fission mode and three asymmetric fission modes, manifested by the different total kinetic energies and fragment mass splits. The yield of symmetric mode grows with increasing excitation energy of compound nucleus. Conclusions: The investigated properties of asymmetric fission of Hg180,182,183 and Pt178 nuclei point out the existence of well-deformed proton shell at Z≈36 and a less deformed proton shell at Z ≈ 46.

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Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
Dubna State University, Dubna, 141980, Russian Federation
Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany
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 R&D in Physics and Nuclear Engineering, Magurele, Bucharest, 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
Dubna State University
Institute of Nuclear Physics
Al-Farabi Kazakh National University
GSI Helmholtzzentrum für Schwerionenforschung
Department of Physics
Department of Physics
Department of Physics
Advanced Science Research Center
Facility for Rare Isotope Beams
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
Dipartimento di Fisica “E. Pancini”
Istituto Nazionale di Fisica Nucleare

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