Some comments on paper by Tishchenko et al, PRL95
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Some comments on paper by Tishchenko 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
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Some comments on paper by Tishchenko 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. Experimental info Tishchenko et al, PRL95. Set-up. Particle identification. - PowerPoint PPT Presentation
Transcript of Some comments on paper by Tishchenko et al, PRL95
Some comments on paper by Tishchenko 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
Experimental info Tishchenko et al, PRL95
Set-up
Particle identification
Results Tishchenko et al, PRL95
"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 ..."
Calculation: INCL2 + GEMINI
Pf ~ exp[2(af(E*-Bf))1/2]/exp[2(anE*)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 1p+Bi 1.017p+Au 1.022
ABRABLA calculations
Tishchenko et al:
Correct description of af/an indispensable for extracting information of fission process!
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:
