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.
Analysis of the sequential fission observed in collisions of100Mo +100Mo and120Sn +120Sn around 20 A·MeV / Stefanini, A.A, Casini, G., Maurenzig, P.R., Olmi, A., Charity, R.J., Freifelder, R., Gobbi, A., Herrmann, N., Hildenbrand, K.D., Petrovici, M., Rami, F., Stelzer, H., Wessels, J.P., Gnirs, M., Pelte, D., Galin, J., Guerreau, D., Jahnke, U., Péghaire, A., Adloff, J.C., et al.. - In: ZEITSCHRIFT FÜR PHYSIK. A, HADRONS AND NUCLEI. - ISSN 0939-7922. - STAMPA. - 351:(1995), pp. 167-186. [10.1007/BF01289527]
Analysis of the sequential fission observed in collisions of100Mo +100Mo and120Sn +120Sn around 20 A·MeV
STEFANINI, ANDREA;CASINI, GIOVANNI;MAURENZIG, PAOLO;OLMI, ALESSANDRO;
1995
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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