Delving into uncharted isotones demonstrating neutron shell closure at N=126.

In our research, we have extensively investigated various decay modes including alpha, beta, proton, and spontaneous fission decay modes, focusing particularly on isotones characterized by N = 1 2 6 and Z spanning from 53 to 100. Alpha-decay, one and two proton-decay half-lives were evaluated using an effective liquid drop model. Beta-decay and spontaneous fission half-lives have been evaluated using semi-empirical formulae. We observed notably shorter β − half-lives within the Z range of 53 to 81 and 2 0 8 Pb is observed to be more stable. The prevalence of α -decay half-lives was prominent for Z values ranging from 83 to 98, with the exception of 2 1 1 At nuclei. Moreover, we identified two spontaneous fission emitters exhibiting half-lives ranging from microseconds to nanoseconds. Our analysis revealed significant neutron shell gaps at Z = 5 4 , 66, 82 and 98 for N = 1 2 6 , pronounced shell structure indicative of relatively stable nuclei. Additionally, certain nuclei such as 1 7 9 I, 2 0 5 Au and 2 1 8 U were found to exhibit lower stability compared to their neighboring nuclei. Our investigation led to the identification of 29 new isotones, comprising 22 β ± emitters, five α emitters and two spontaneous emitters. These newly identified isotones, synthesizable through fusion reactions, significantly contribute to advancing our comprehension of nuclear decay processes and isotonic behavior with N = 1 2 6. [ABSTRACT FROM AUTHOR]