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Analysis of the sequential fission observed in collisions of100Mo +100Mo and120Sn +120Sn around 20 A·MeV

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Zeitschrift für Physik A Hadrons and Nuclei

Abstract

Events with 2, 3 and 4 heavy fragments (A≥20) detected in the reactions100Mo +100Mo at 18.7, 23.7 A·MeV and120Sn +120Sn at 18.4 A·MeV were analyzed by means of an improved version of the kinematic coincidence method. The phase-space distributions prove that 3- (and possibly 4-) body events predominantly originate from a two-step mechanism and are compatible with the hypothesis of a binary deep-inelastic interaction followed by the further fissionlike decay of one (or both) of the primary fragments. The characteristics of the fission step — mass asymmetry, relative velocity, in-plane and out-of-plane angles — have been reconstructed for the 3-body events and indications are found that nonequilibrium effects at the end of the deep-inelastic phase may influence the fissionlike decay.

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Author information

Author notes

  1. R. J. Charity

    Present address: Department of Chemistry, Washington University, St. Louis, Missouri, USA

  2. R. Freifelder

    Present address: Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA

  3. J. P. Wessels

    Present address: Department of Physics, SUNY, Stony Brook, New York, USA

Authors and Affiliations

  1. INFN and Università di Firenze, Largo E. Fermi 2, I-50125, Firenze, Italy

    A. A. Stefanini, G. Casini, P. R. Maurenzig & A. Olmi

  2. Gesellschaft für Schwerionenforschung, Postfach 110552, D-64220, Darmstadt, Germany

    R. J. Charity, R. Freifelder, A. Gobbi, N. Herrmann, K. D. Hildenbrand, M. Petrovici, F. Rami & J. P. Wessels

  3. Physikalisches Institut der Universität Heidelberg, Albert Ueberk-Weg, Heidelberg, Germany

    H. Stelzer, M. Gnirs & D. Pelte

  4. GANIL, BP 5027, F-14021, Caen Cedex, France

    J. Galin, D. Guerreau, U. Jahnke & A. Péghaire

  5. CRN and Université Louis Pasteur, BP 20, F-67037, Strasbourg Cedex 2, France

    J. C. Adloff, B. Bilwes, R. Bilwes & G. Rudolf

Authors
  1. A. A. Stefanini
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  2. G. Casini
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  3. P. R. Maurenzig
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Additional information

On leave from: INPE, Bucharest, Romania

On leave from: CRN and Université Louis Pasteur, F-67037 Strasbourg, France

On leave from: Hahn-Meitner-Institut, D-14109 Berlin, Germany

Deceased

We gratefully acknowledge many stimulating discussions with P.G. Bizzeti and useful suggestions from M. Bini. We wish to thank also the staffs of the UNILAC and GANIL accelerators for their efforts to deliver high quality beams for the experiments.

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Stefanini, A.A., Casini, G., Maurenzig, P.R. et al. Analysis of the sequential fission observed in collisions of100Mo +100Mo and120Sn +120Sn around 20 A·MeV. Z. Physik A - Hadrons and Nuclei 351, 167–186 (1995). https://doi.org/10.1007/BF01289527

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