Strong influence of the entrance channel on the formation of compound nuclei Th216,222* and their evaporation residues

G. Fazio, G. Giardina, G. Mandaglio, R. Ruggeri, A. I. Muminov, A. K. Nasirov, Yu. Ts. Oganessian, A. G. Popeko, R. N. Sagaidak, A. V. Yeremin, S. Hofmann, F. Hanappe, and C. Stodel
Phys. Rev. C 72, 064614 – Published 22 December 2005

Abstract

The dynamical effects of the entrance channel on the formation of the evaporation residues are studied by analyzing the Ar40+Hf176, Kr86+Xe130,136, Sn124+Zr92, and Ca48+Yb174 reactions leading to the Th216* and Th222* compound nuclei. We find that the difference between the evaporation residue cross sections for the reactions leading to the same compound nucleus is caused by the different angular momentum distributions of the partial fusion cross sections σfus(Ec.m.). The strong dependence of the fusion angular momentum distribution on the mass (charge) asymmetry and shell structure of reactants is demonstrated. The effect of the A/Z ratio for the Kr86+Xe130,136 reactions is discussed. The dynamical conditions of capture affect the competition between complete fusion and quasifission and, consequently, the shape of the angular momentum distribution of the compound nucleus. By this way the peculiarities of the entrance channel also affect the fission-evaporation competition of the excited intermediate nuclei along the deexcitation cascade of the compound nucleus and, consequently, the evaporation residue formation.

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  • Received 20 June 2005

DOI:https://doi.org/10.1103/PhysRevC.72.064614

©2005 American Physical Society

Authors & Affiliations

G. Fazio, G. Giardina*, G. Mandaglio, and R. Ruggeri

  • INFN, Sezione di Catania, and Dipartimento di Fisica dell'Università di Messina, 98166 Messina, Italy

A. I. Muminov

  • Heavy Ion Physics Department, Institute of Nuclear Physics, 702132 Tashkent, Uzbekistan

A. K. Nasirov, Yu. Ts. Oganessian, A. G. Popeko, R. N. Sagaidak, and A. V. Yeremin

  • Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia

S. Hofmann

  • Gesellschaft für Schwerionenforschung mbH, 64291 Darmstadt, Germany

F. Hanappe

  • Université Libre de Bruxelles, 1050 Bruxelles, Belgium

C. Stodel

  • GANIL, 14076 Caen, France

  • *Electronic address: giardina@nucleo.unime.it
  • Also at Heavy Ion Physics Department, INP, Tashkent, Uzbekistan.

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Issue

Vol. 72, Iss. 6 — December 2005

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