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Observation of fast collinear partitioning of the 197Au + 197Au system into three and four fragments of comparable size

Abstract : Collisions of a very heavy nonfusing nuclear system 197Au + 197Au were studied at an energy of 15MeV/ nucleon. An interesting process of violent reseparation of this heavy system into three or four fragments of comparable size was observed. In the case of ternary partitioning, either the projectile-like fragment (PLF) or target-like fragment (TLF) breaks up almost collinearly with the PLF-TLF separation axis. In the case of quaternary reactions, both PLF and TLF were observed breaking up along this direction. By comparison with a dynamical model of deep inelastic collisions it was concluded that the ternary and quaternary reactions occur in semiperipheral collisions, in a range of angular momenta corresponding to about 0.5–0.7 of the maximum L value for grazing collisions. The time elapsing from the scission of the binary PLF + TLF system to the secondary scission of PLF or TLF was estimated to be of about 70–80 fm/c for the ternary reactions and 80–100 fm/c for the quaternary reactions.
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http://hal.in2p3.fr/in2p3-00460803
Contributor : Michel Lion <>
Submitted on : Tuesday, March 2, 2010 - 3:07:23 PM
Last modification on : Thursday, February 1, 2018 - 1:27:04 AM

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J. Wilczynski, I. Skwira-Chalot, K. Siwek-Wilczynska, A. Pagano, F. Amorini, et al.. Observation of fast collinear partitioning of the 197Au + 197Au system into three and four fragments of comparable size. Physical Review C, American Physical Society, 2010, 81, pp.024605. ⟨10.1103/PhysRevC.81.024605⟩. ⟨in2p3-00460803⟩

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