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

TL;DR

This paper investigates how charged particle emission influences evaporation residue formation in the $^{82}$Se+$^{138}$Ba reaction leading to $^{220}$Th, combining theoretical models with experimental data to understand residue production mechanisms.

Contribution

It provides a detailed theoretical analysis of charged particle emissions' role in evaporation residue formation, highlighting discrepancies with experimental data and emphasizing the importance of charged particle detection.

Findings

Theoretical ER cross sections agree with experimental data for some cases.

Overall theoretical ER yields are higher than experimental measurements.

Charged particle emissions significantly affect evaporation residue formation.

Abstract

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 $^{82}$Se+$^{138}$Ba 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 $^{220}$Th compound nucleus (CN) covering the wide 12--70 MeV excitation energy range. Our specific theoretical results on the ER cross sections for the $^{82}$Se+$^{138}$Ba 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.