Cross-sections for the formation of isomeric pair 75Gem,g through (n, 2n), (n, p) and (n, α) reactions measured over 13.73 MeV to 14.77 MeV and calculated from near threshold to 20 MeV neutron energies Original Research Article

The cross-sections for formation of isomeric pair, 75Gem(σm) and 75Geg(σg), through 76Ge(n, 2n), 75As(n, p) and 78Se(n, α) reactions were measured at 13.73 MeV, 14.42 MeV and 14.77 MeV neutrons and also estimated using EMPIRE-II and TALYS codes over neutron energies from near threshold to 20 MeV. For each (n, 2n), (n, p) and (n, α) reaction, the cross-section initially increases with neutron energy, but starts decreasing as the neutron energy exceeds the respective threshold of (n, 3n), (n, pn) and (n, αn) reactions. The higher values of σm relative to σg reveal that the transitions of the excited 75Ge from higher energy levels to metastable state (7+/2) are favored as compared to unstable ground state (1−/2). The present values of cross sections for formation of 75Gem,g through (n, 2n) and (n, α) reactions are lower, and that of (n, p) reaction are higher compared to most of the corresponding literature cross-sections.