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

Abstract

The ⁸⁰Se(γ, n)⁷⁹Se 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 ⁷⁹Se(n, γ)⁸⁰Se cross section. An enriched ⁸⁰Se sample and a reference ¹⁹⁷Au 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-³He detector. The excitation function of the ⁸⁰Se(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.

KEYWORDS:

• photonuclear reaction
• neutron capture cross section
• inverse reaction
• Se-80
• Se-79
• Au-197
• laser-Compton scattering gamma rays
• high-energy gamma rays
• high-resolution spectrometer