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Insights into Fission Process from Excitation Functions of Various Systems

Analyzing fission dynamics in systems like p+U, p+Bi, and p+Au at high excitation energies. The study focuses on particle identification, calculations using INCL2 and GEMINI models, and the impact of af/an on fission probability. Prerequisite for accurate analysis is understanding early fission dynamics and correct description of af/an. Open questions include E* extraction from model vs. experiment and high-E* particles.

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Insights into Fission Process from Excitation Functions of Various Systems

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  1. Some comments on paper byTishchenko et al, PRL95 Information on the fission process from fission excitation function from following systems: p + U p + Bi @ 2.1 A GeV p + Au

  2. Experimental info Tishchenko et al, PRL95 Set-up Particle identification

  3. Results Tishchenko et al, PRL95 Calculation: INCL2 + GEMINI "Prerequisite for this good agreement is that no additional transient delay time is allowed for the fission dynamics at the saddle. Fission thus seems to be decided upon very fast and early in the long deexcitation chain from the highest initial excitations ..."

  4. Pf ~ exp[2(af(E*-Bf))1/2]/exp[2(anE*)1/2]  - Bf and af/an have an important influence on Pf - af/an > 1 (e.g. Ignatyuk et al., Sov.J.Nucl.Phys. 21(1975) 612; Karpov et al., J.Phys.G 29 (2003) 2365) • Spallation reactions- Distribution of initial nuclei and excitation energies  Different nuclei (deformation, fission barrier, angular momentum...) fission at different excitation energies Tishchenko et al: System: af/an: p+U 1 p+Bi 1.017 p+Au 1.022

  5. ABRABLA calculations Tishchenko et al: Correct description of af/an indispensable for extracting information of fission process!

  6. Open questions - Do we have wrong understanding of fission dynamics? - Extraction of E*: 1. From model: E* vs. particle multiplicity 2. From experiment: particle multiplicity - High-E* part:

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