[en] Measurements of absolute neutron capture cross sections of 45Sc, sup(nat)Zr, 159Tb and sup(nat)Re were carried out in the 0.5 to 2.5 MeV energy range by means of the integrated spectrum technique. Generally, the capture cross section represents a small fraction of the total cross section at these energies (about 0.5 % for Sc and Zr) and, consequently, is very difficult to measure