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Analysis of the sequential fission observed in collisions of100Mo +100Mo and120Sn +120Sn around 20 A·MeV |
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| Authors: | A. A. Stefanini G. Casini P. R. Maurenzig A. Olmi R. J. Charity R. Freifelder A. Gobbi N. Herrmann K. D. Hildenbrand M. Petrovici F. Rami H. Stelzer J. P. Wessels M. Gnirs D. Pelte J. Galin D. Guerreau U. Jahnke A. Péghaire J. C. Adloff B. Bilwes R. Bilwes G. Rudolf |
| Affiliation: | 1. INFN and Università di Firenze, Largo E. Fermi 2, I-50125, Firenze, Italy 2. Gesellschaft für Schwerionenforschung, Postfach 110552, D-64220, Darmstadt, Germany 5. Physikalisches Institut der Universit?t Heidelberg, Albert Ueberk-Weg, Heidelberg, Germany 7. GANIL, BP 5027, F-14021, Caen Cedex, France 8. CRN and Université Louis Pasteur, BP 20, F-67037, Strasbourg Cedex 2, France |
| 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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