Radioactive decay chains of

A comprehensive theoretical investigation of the radioactive decay properties of the neutron-rich isotope 235Bk has been carried out by systematically exploring all energetically possible decay modes, including α decay, β± decay, electron capture (EC), one and two proton emission, and spontaneous fission. The decay energies and corresponding half-lives were evaluated using a consistent theoretical framework that combines the Coulomb and proximity potential model for particle emission, recently developed semi-empirical formulas for weak decays, and an empirical relation for spontaneous fission. The calculated Q values indicate that α decay, β+ decay, and EC are energetically allowed for 235Bk, whereas proton emission and β− decay are strongly suppressed due to unfavorable energy balances, and spontaneous fission is hindered by its comparatively longer timescale. A detailed analysis of logarithmic half-lives reveals that weak-interaction-driven decay modes dominate the initial decay of 235Bk, with β+-decay identified as the most dominant channel, closely competing with EC. Although the decay of α is energetically favorable, its longer half-life makes it a secondary decay mode in the early stages. The complete decay chain of 235Bk has been traced up to the stable nucleus 207Pb, demonstrating a systematic transition from β+/EC decay to predominant α decay in heavier daughter nuclei, along with occasional β− transitions. The decay chain of 235Bk has important applications in nuclear structure and decay studies, particularly in understanding the competition between weak-interaction processes and α-decay in heavy and actinide nuclei.