arXiv:nucl-th/0111034·v2·Nuclear Theory
Effects of shell structure in reactions leading to the same compound nucleus or different isotopes
A. K. Nasirov (1 and 3)🇷🇺 · G. Fazio (2)🇮🇹 · G. Giardina (2)🇮🇹 · A. Lamberto (2)🇮🇹 · R. Ruggeri (2)🇮🇹 · A. Taccone (2)🇮🇹 · A. I. Muminov (3)🇺🇿 · F. Hanappe (4)🇧🇪 · R. Palamara (5)🇮🇹 · L. Stuttg'e (6) ((1) JINR, Dubna, Russia, (2) INFN, Sezione di Catania and Dipartimento di Fisica dell'Universit`a di Messina, Italy, (3) INP, Tashkent, Uzbekistan, (4) Universit'e Libre de Bruxelles, Bruxelles, Belgium, (5) Facolt`a di Architettura dell'Universit`a di Reggio Calabria, Italy, (6) Institut de Recherches Subatomiques, Strasbourg, France)🇫🇷
Abstract
The role of the entrance channel in fusion-fission reactions was studied by the theoretical analysis of the experimental evaporation residue excitation functions for reactions leading to the same compound nucleus. The evaporation residues cross sections for xn-channels were calculated in the frame of the combined dinuclear system concept and advanced statistical model. The revealed differences between experimental data on the evaporation residues in the ^{40}Ar+^{176}Hf, ^{86}Kr + ^{130}Xe and ^{124}Sn + ^{92}Zr reactions leading to the ^{216}Th^* compound nucleus are explained by the different spin distributions of compound nuclei which are formed. It is shown that the intrinsic fusion barrier B^*_{fus} and size of potential well are different for every entrance channel.
Comments: 14 pages, 5 EPS figures, Latex, ws-p8-50x6-00.cls is used, Talk given at the Conference NPBL2001, Lipari (Messina, Italy), 21-24 May, 2001