Role of charged particle emission on the evaporation residue formation in the Se-82+Ba-138 reaction leading to the Th-220 compound nucleus

摘要

We present detailed results of a theoretical investigation on the production of evaporation residue nuclei obtained in a heavy ion reaction when charged particles (proton and alpha-particle) are also emitted with the neutron evaporation along the deexcitation cascade of the formed compound nucleus. The almost mass symmetric Se-82+Ba-138 reaction has been studied since there are many experimental results on individual evaporation residue (ER) cross sections after few light particle emissions along the cascade of the Th-220 compound nucleus (CN) covering the wide 12-70 MeV excitation energy range. Our specific theoretical results on the ER cross sections for the Se-82+Ba-138 are in good agreement with the available experimental measurements, but our overall theoretical results concerning all possible relevant contributions of evaporation residues are several times greater than the ERs measured in experiment. The discrepancy could be due to the experimental difficulties in the identification of ER nuclei after the emission of multiple neutral and charged particles, nevertheless the analysis of ER data is very important to test the reliability of the model and to stress the importance on the investigation of ER nuclei also obtained after charged particle emissions. (C) 2018 Elsevier B.V. All rights reserved.