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The complete nuclear reaction is:
158 0
64 Gd ----→ -1 e + 158
65 Tb
The reaction represents beta decay, where a neutron in the Gd nucleus decays into a proton, an electron (beta particle), and an antineutrino. The atomic number increases by one (from 64 to 65), resulting in the formation of Terbium (Tb). The mass number remains the same (158).