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Measurement of the fusion probability, P[subscript CN], for hot fusion reactions

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  • Abstract: Background: The cross section for forming a heavy evaporation residue in fusion reactions depends on the capture cross section, the fusion probability, P[subscript CN], i.e., the probability that the projectile-target system will evolve inside the fission saddle point to form a completely fused system rather than reseparating (quasifission), and the survival of the completely fused system against fission. P[subscript CN] is the least known of these quantities. Purpose: We want to determine P[subscript CN] for the reactions of 101.2 MeV ¹⁸O, 147.3 MeV ²⁶Mg, 170.9 MeV ³⁰Si, and 195.3 MeV ³⁶S with ¹⁹⁷Au. Methods: We measured the fission fragment angular distributions for these reactions and used the formalism of Back to deduce the fusion-fission and quasifission cross sections. From these quantities we deduced P[subscript CN] for each reaction. Results: The values of P[subscript CN] for the reactions of 101.2 MeV ¹⁸O, 147.3 MeV ²⁶Mg, 170.9 MeV ³⁰Si, and 195.3 MeV ³⁶S with ¹⁹⁷Au are 0.66, 1.00, 0.06, and 0.13 respectively. Conclusions: The new measured values of P[subscript CN] agree roughly with the semiempirical systematic dependence of P[subscript CN] upon fissility for excited nuclei.
  • Keywords: Mass asymmetry, Capture reactions, Collisions, Cross sections, Angular distributions, Excitation energies, Compound nucleus formation, Heavy ion reactions, Quasi fission, Dynamics
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  • Yanez, R., Loveland, W., Barrett, J., Yao, L., Back, B., Zhu, S....Khoo, T. (2013). Measurement of the fusion probability, P-CN, for hot fusion reactions. Physical Review C, 88(1) doi:10.1103/PhysRevC.88.014606
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  • 88
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  • 1
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  • This work was supported in part by the Director, Office of Energy Research, Division of Nuclear Physics of the Office of High Energy and Nuclear Physics of the U.S. Department of Energy, under Grant No. DE-FG06-97ER41026 and Contract No. DE-AC02-06CH11357.
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