Maqola

Heavy residues and intermediate-mass fragment production in dissipative<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>197</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Au</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>86</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Kr</mml:mi></mml:math>collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>E</mml:mi><mml:mo>/</mml:mo><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>35</mml:mn><mml:mn/><mml:mi> </mml:mi><mml:mi mathvariant="normal">MeV</mml:mi></mml:math>

B. DjerroudDepartment of Chemistry, University of Rochester, Rochester, New York 14627D. K. AgnihotriDepartment of Chemistry, University of Rochester, Rochester, New York 14627S. P. BaldwinDepartment of Chemistry, University of Rochester, Rochester, New York 14627W. SkulskiDepartment of Chemistry, University of Rochester, Rochester, New York 14627J. TõkeDepartment of Chemistry, University of Rochester, Rochester, New York 14627W. U. SchröderDepartment of Chemistry, University of Rochester, Rochester, New York 14627R. J. CharityDepartment of Chemistry, University of Rochester, Rochester, New York 14627J.F. DempseyDepartment of Chemistry, University of Rochester, Rochester, New York 14627D. G. SarantitesDepartment of Chemistry, University of Rochester, Rochester, New York 14627L. G. SobotkaDepartment of Chemistry, University of Rochester, Rochester, New York 14627B. LottDepartment of Chemistry, University of Rochester, Rochester, New York 14627W. LovelandDepartment of Chemistry, University of Rochester, Rochester, New York 14627K. AleklettDepartment of Chemistry, University of Rochester, Rochester, New York 14627

2001lv

ABI

Annotatsiya

Neutrons and charged light and intermediate-mass products from the ${}^{197}\mathrm{Au}{+}^{86}\mathrm{Kr}$ reaction at ${E}_{\mathrm{lab}}/A=35 \mathrm{MeV}$ were measured with $4\ensuremath{\pi}$ angular coverage, in coincidence with projectilelike (PLFs) and targetlike fragments (TLFs). The characteristics of PLF and TLF yields and their correlation with neutron, light-charged particles, and intermediate-mass fragments (IMFs) are consistent with a scenario where essentially all collisions proceed through a dissipative stage. It is found that the damping of the available kinetic energy into thermal excitation is essentially incomplete, with no positive evidence for complete damping. Slow, massive reaction products are observed with significant yields. These products, termed also heavy residues, are identified as TLF evaporation residues and as TLF fission fragments. The TLF fission mode is seen to fade away in favor of TLF evaporation residue production for excitation energies above 3--4 MeV/nucleon. The suppression of the TLF fission can be traced to the dynamical IMF production process which reduces considerably the sizes of the primary reaction fragments and, hence, their fissility.

Identifikatorlar

DOI: 10.1103/physrevc.64.034603

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