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

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  • Measurement of the fusion probability, PCN, 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.
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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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