[en] Precise measurements of γ-ray energies up to 3.5 MeV from several radionuclides were made using Ge(Li) detectors. Also, the ¹H(n,γ) reaction γ-ray energy was measured and from it a value was obtained for the deuteron binding energy. Combining this S/sub n/(²H) with published mass differences, values were obtained for the neutron binding energies of ³H, ¹³C, ¹⁴C, and ¹⁵N, and for the neutron mass excess. This value of S/sub n/(¹⁵N) was used in conjunction with measured γ-ray energy differences to obtain energies of selected γ rays from the ¹⁵N(n,γ) reaction up to 10.8 MeV. 29 references