Study on nuclear isomers in odd-even 67-79As, 71-83Br, and 83-89Rb isotopes

Abstract

Study on nuclear isomers is one of the way to understand the structure of certain nucleus. The odd-even 67-79As, 79-83Br and 83-89Rb isomers excited around 68Ni had been confirmed as sub-shell closure based on the research conducted by Broda and his group in 1995. The odd-even 67-79As, 79-83Br and 83-89Rb were selected in this work to investigate the theoretical isomerism of nuclei. The odd-even populated nuclei of 67-79As, 79-83Br, and 83-89Rb were considered in this work by using Deep-Inelastic Collisions reaction of 76Ge (635MeV) + 198Pt. The theoretical calculations were carried out to investigate the characteristics of isomeric level, magnetic reduced transition probabilities B(M2), binding energy (B.E), mean-lifetime (τ) width of isomeric level (Γγ), hindrance factor (Fw), fragments energy (PLF) and Coulomb barrier for the isotopes. The Nuclear Reaction Video was used to determine the fragments energy of the isomers. Odd-even 67-79As, 79-83Br and 83-89Rb isomers were populated as a single particle excited states near to the shell closure Z=28 and N=40 of 68Ni. The isomers were assigned to B(M2) transition and compared with the experimental data taken from Nuclear Data Sheets. The results were in good agreement with the experimental data within the experimental error. The calculated value of binding energy, width of isomeric level, hindrance factor and fragment energy were plotted as a function of mass number in order to observe the characteristic of the isomers.