Measurement of the 80Se(γ, n) Cross Section Using Laser-Compton Scattering γ-Rays

The 80 Se(γ, n) 79 Se cross section was measured with laser-Compton scattering (LCS) γ-rays to supply fundamental data for the estimation of the inverse reaction cross sections, i.e., the 79 Se(n, γ) 80 Se cross section. An enriched 80 Se sample and a reference 197 Au sample were irradiated with LCS γ-rays whose maximum energy was varied from 10.5 to 16.0 MeV. The energy distributions of LCS γ-rays were precisely determined using a high-resolution high-energy photon spectrometer (HHS). Emitted neutrons were detected by a high-efficiency 4π- 3 He detector. The excitation function of the 80 Se(γ, n) cross section was determined for the energy range of 10.2-14.6 MeV. The energy point corresponding to each cross section was deduced using the accurately determined energy distribution of LCS γ-rays.