Measurement of neutron activation and photoneutron cross sections

Using a semi-monoenergetic neutron field which was produced from a Be target bombarded by protons of 9 different energies between 20 and 40 MeV, we measured the neutron activation cross sections of natural samples of Na, Mg, Al, Si, Ca, V, Cr, Mn, Cu, Zn and Au in the energy range of 10 to 40 MeV. We also measured the average photoneutron cross sections of 137Cs, 84Sr, 86Sr, 88SSr, 85Rb, 87Rb, 98Ru and 104Ru isotopes in giant dipole resonance region from 9 to 25 MeV, using bremsstrahlung radiation of 60 MeV maximum energy. For the measurement of 137Cs(γ,n) cross section, we used the nuclear recoil separation method coupled with the internal standard (natural 133Cs) technique. We investigated the isotopic dependence of the average photoneutron cross sections in giant resonance region from our experimental data and other experimental data for Ge, Se, Zr, Mo, Sn, Te, Ce, Nd and Sm isotopes. (author)