Measurement of ⁷⁶Se and ⁷⁸Se (γ, n) Cross Sections

Abstract

The (γ, n) cross sections of Se isotopes (⁷⁶Se,⁷⁸Se) were measured to supply fundamental data for estimating the inverse reaction cross section, i.e., the ⁷⁹Se(n, γ)⁸⁰Se cross section. The enriched samples and a reference ¹⁹⁷Au sample were irradiated with laser-Compton scattering (LCS) γ-rays. The excitation function of each (γ, n) cross section was determined for the energy range from each near neutron separation energy to the threshold energy of (γ, 2n) reaction. The energy point corresponding to each cross section was deduced using the accurately determined energy distribution of LCS γ-rays. Systematic (γ, n) cross sections for Se isotopes including ⁸⁰Se were compared with those calculated by using a statistical model calculation code TALYS.

KEYWORDS:

• photonuclear reaction
• neutron capture cross section
• inverse reaction
• Se-76
• Se-78
• Se-80
• Se-79
• Au-197
• laser-Compton scattering gamma rays
• gamma ray strength function