Statistical emission of complex fragments from highly excited compound nucleus
- Conference date: 6−8 Jun 1991
- Location: Nikko (Japan)
In order to study the mechanism of complex fragments production from highly excited light and medium compound nucleus induced by relatively low energy heavy ion reactions, the full statistical analysis have been performed in terms of Extended Hauser Feshbach (EHF) method. At first the charge‐ and kinetic energy‐distributions of 35 Cl+12 C reaction at (E Lab =180,200 MeV) and 23 Na +24 Mg reaction at (E Lab =89 MeV) which form the 47 V compound nucleus of almost same excitation energy are extensively investigated as a prototype of the light mass system. The variations in observed cross section from fragment to fragment are understood by the variations of binding energy of the lighter fragments of binary decay from the compound nucleus. The difference of the yield in the measured cross sections between the reactions is interpreted as the entrance channel effect that 23 Na +24 Mg channel has the larger critical angular momentum for fusion cross section than 35 Cl+12 C channel. The measured kinetic energy distributions in the laboratory system of the complex fragments are shown to be well reproduced by the EHF‐method. Therefore the observed complex fragment production are understood as the statistical binary decay from the compound nucleus induced by heavy‐ion reaction. Next, the EHF‐method is extensively applied to the study of the complex production from the 111 In compound nucleus which formed by the 84 Kr+27 Al reaction at (E Lab =890 MeV). Because the complex fragments (fissioning fragments) in the first step decay from this compound nucleus have large spins and highly excitation energies, the complex fragments decay sequentially by emitting the light particles. It is shown that the effect of multi‐step cascade decay of fissioning fragments is very important for reproducing the general trend of the observed quantities such as the observed isotope‐mass distributions.
- Compound nucleus
- Heavy ion reactions
- Compound nucleus reactions
- Chemical reaction cross sections
- Excited state reaction dynamics
- Excitation energies
- Fusion reactions
- Reaction kinetics modeling
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Y. K. Semertzidis, M. Aoki, M. Auzinsh, V. Balakin, A. Bazhan, G. W. Bennett, R. M. Carey, P. Cushman, P. T. Debevec, A. Dudnikov, F. J. M. Farley, D. W. Hertzog, M. Iwasaki, K. Jungmann, D. Kawall, B. Khazin, I. B. Khriplovich, B. Kirk, Y. Kuno, D. M. Lazarus, L. B. Leipuner, V. Logashenko, K. R. Lynch, W. J. Marciano, R. McNabb, W. Meng, J. P. Miller, W. M. Morse, C. J. G. Onderwater, Y. F. Orlov, C. S. Ozben, R. Prigl, S. Rescia, B. L. Roberts, N. Shafer‐Ray, A. Silenko, E. J. Stephenson, K. Yoshimura and EDM Collaboration
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