The present investigation examines multiple decay channels, including α decay, β± decay, and proton emission, with particular emphasis on isotones possessing neutron number N = 50 and proton numbers in the range 19 ≤ Z ≤ 54. Theoretical calculations indicate comparatively short β− -decay half-lives for nuclei with Z between 10 and 32, whereas significantly longer half-lives are observed for Z = 33–48. This trend is consistent with available experimental data. Enhanced shell effects are identified at Z = 26, 39, 50, and 51 for N = 50, reflecting pronounced neutron shell gaps that contribute to increased nuclear stability for the corresponding isotones. A total of eleven previously unreported isotones are predicted in this region, comprising seven β± emitters, two one-proton emitters, and two two-proton emitters. The theoretically identified β± emitters are 7222Ti (0.219 ms), 7121Sc (0.83 μs), 7020Ca (0.316 μs), 6919K (0.12μs), 7525Mn (3.98 ms), 7424Cr (1.51 ms), and 7323V (0.57 ms). In addition, the nuclei 10151Sb (0.29 ns) and 10353I (0.22 ns) are predicted to undergo one-proton emission, while 10252Te (0.22 ns) and 10454V (0.27 ns) are identified as two-proton emitters. These experimentally non-observed isotones are expected to be accessible through suitable fusion reactions. Overall, this study provides deeper insight into decay mechanisms and shell-driven stability in N = 50 isotonic chains, thereby contributing to a more comprehensive understanding of nuclear structure and decay behavior in this mass region.
Nagaraj et al. (Wed,) studied this question.